Articoli di riviste sul tema "Olfactory perceptual learning"

Defining perceptual similarity metrics for odorant comparisons is crucial to understanding the mechanism of olfactory perception. Current methods in olfaction rely on molecular physicochemical features or discrete verbal descriptors (floral, burnt, etc.) to approximate perceptual (dis)similarity between odorants. However, structural or verbal descriptors alone are limited in modeling complex nuances of odor perception. While structural features inadequately characterize odor perception, language-based discrete descriptors lack the granularity needed to model a continuous perception space. We introduce data-driven approaches to perceptual metrics learning (PMeL) based on two key insights: a) by combining physicochemical features with the user’s perceptual feedback, we can leverage both structural and perceptual attributes of odors to define dissimilarity, and b) instead of discrete labels, user’s perceptual feedback can be gathered as relative similarity comparisons, such as “Does molecule-A smell more like molecule-B, or molecule-C?” These triplet comparisons are easier even for non-experts users and offer a more effective representation of the continuous perception space. Experimental results on several defined tasks show the effectiveness of our approach in evaluating perceptual dissimilarity between odorants. Finally, we investigate how closely our model, trained on non-expert feedback, aligns with the expert’s similarity judgments. Our effort aims to reduce reliance on expert annotations.

Research Problem: The purpose of this research synthesis is to identify new opportunities for smell-enabled games based upon current olfactory research, and to present early game concepts that have emerged from our empirical assessments. Literature Review: We briefly summarize key projects in the history of scent technologies for film and media. Human-Computer Interaction researchers have also explored a number of uses for scent delivery in interactive digital media. Recent developments in olfactory psychology and neuroscience research suggest that a fruitful avenue for exploration is to develop learning games that expand olfactory capacity. Methodology: We have conducted two studies of computer-based perceptual and cognitive olfactory tasks. Mixture perception experiment: We designed a perceptual experiment where the task was to correctly estimate the intensity of odor components in a blend of coffee and tea. Blended odors were presented to 10 healthy adults by means of a computer-controlled olfactometer. Following each stimulation, the participant used a computer interface to estimate the intensity of components of the blend. Event-based memory experiment: We have developed a digital olfactory version of the children’s game “Memory.” The game interface consists of 32 white squares that are presented in a grid pattern on the screen and that, when participants click on them, triggers the release of one of eight possible smells from the olfactometer. Fifteen healthy adult participants were tested in 10 laboratory sessions distributed over three weeks. Results and Conclusions: Our empirical results suggest that smell training through learning games holds promise as a means of improving cognitive function. The results of our event-based memory experiment suggest that both olfactory and visual memory capacities might have benefitted from olfactory game training. The results of our mixture perception experiment indicate that binary odor mixtures might provide a suitable starting point for perceptual training, and we suggest that a smell-enabled game might include adaptive difficulty by progressively introducing more complex mixtures. We have used event-based memory and mixture perception as “olfactory targets” for game mechanic development, and present early design concepts for “Smelly Genes” and “Scenter.” Finally, we discuss future directions and challenges for this new, interdisciplinary research topic.

Addition of newly generated neurons into mature neural circuits in the adult CNS responds to changes in neurotransmitter levels and is tightly coupled to the activity of specific brain regions. This postnatal neurogenesis contributes to plasticity of the olfactory bulb and hippocampus and is thought to play a role in learning and memory, context and odor discrimination, as well as perceptual learning. While acetylcholine plays an important role in odor discrimination and perceptual learning, its role in adult neurogenesis in the olfactory bulb has not been elucidated. In this study, I have examined the functional expression of nAChRs in progenitor cells of the rostral migratory stream (RMS) in the adult olfactory bulb of mice. I show that most of these cells in the RMS exhibit large nAChR-mediated calcium transients upon application of acetylcholine (ACh). Unlike in the hippocampus, the predominant functional nAChRs on progenitor cells are of α3β4 subtype. Interestingly, functional receptor expression is lost once progenitor cells mature, and are incorporated into the granule cell layer. Instead, nAChRs are now expressed on some presynaptic terminals and modulate glutamate release onto granule cells. My results imply that ACh is a part of the permissive niche and likely plays a role in development of progenitor cells.

Olfactory perception and its underlying neural mechanisms are not fixed, but rather vary over time, dependent on various parameters such as state, task, or learning experience. In olfaction, one of the primary sensory areas beyond the olfactory bulb is the piriform cortex. Due to an increasing number of functions attributed to the piriform cortex, it has been argued to be an associative cortex rather than a simple primary sensory cortex. In fact, the piriform cortex plays a key role in creating olfactory percepts, helping to form configural odor objects from the molecular features extracted in the nose. Moreover, its dynamic interactions with other olfactory and nonolfactory areas are also critical in shaping the olfactory percept and resulting behavioral responses. In this brief review, we will describe the key role of the piriform cortex in the larger olfactory perceptual network, some of the many actors of this network, and the importance of the dynamic interactions among the piriform-trans-thalamic and limbic pathways.

Experience shapes both central olfactory system function and odor perception. In piriform cortex, odor experience appears critical for synthetic processing of odor mixtures, which contributes to perceptual learning and perceptual acuity, as well as contributing to memory for events and/or rewards associated with odors. Here, we examined the effect of odor fear conditioning on piriform cortical single-unit responses to the learned aversive odor, as well as its effects on similar (overlapping mixtures) in freely moving rats. We found that odor-evoked fear responses were training paradigm dependent. Simple association of a condition stimulus positive (CS+) odor with foot shock (unconditioned stimulus) led to generalized fear (cue-evoked freezing) to similar odors. However, after differential conditioning, which included trials where a CS− odor (a mixture overlapping with the CS+) was not paired with shock, freezing responses were CS+ odor specific and less generalized. Pseudoconditioning led to no odor-evoked freezing. These differential levels of stimulus control over freezing were associated with different training-induced changes in single-unit odor responses in anterior piriform cortex (aPCX). Both simple and differential conditioning induced a significant decrease in aPCX single-unit spontaneous activity compared with pretraining levels while pseudoconditioning did not. Simple conditioning enhanced mean receptive field size (breadth of tuning) of the aPCX units, while differential conditioning reduced mean receptive field size. These results suggest that generalized fear is associated with an impairment of olfactory cortical discrimination. Furthermore, changes in sensory processing are dependent on the nature of training and can predict the stimulus-controlled behavioral outcome of the training.

Recent studies of olfactory blocking have revealed that binary odorant mixtures are not always processed as though they give rise to mixture-unique configural properties. When animals are conditioned to one odorant (A) and then conditioned to a mixture of that odorant with a second (X), the ability to learn or express the association of X with reinforcement appears to be reduced relative to animals that were not preconditioned to A. A recent model of odor-based response patterns in the insect antennal lobe predicts that the strength of the blocking effect will be related to the perceptual similarity between the two odorants, i.e. greater similarity should increase the blocking effect. Here, we test that model in the honeybee Apis mellifera by first establishing a generalization matrix for three odorants and then testing for blocking between all possible combinations of them. We confirm earlier findings demonstrating the occurrence of the blocking effect in olfactory learning of compound stimuli. We show that the occurrence and the strength of the blocking effect depend on the odorants used in the experiment. In addition, we find very good agreement between our results and the model, and less agreement between our results and an alternative model recently proposed to explain the effect.

Despite the growing tendency to create playful corners on the part of the MIES and the MINEDUC, in the CDI there continues to be an urgent need for change in the actions of the educators, with respect to how the subject of sensory activities is being handled in the stimulation of children in their first years of life and thus implement meaningful learning, the problem focuses on the lack of sensory playful corners in perceptual stimulation The study was applied to 20 educators of 5 care units of the modality Child Development Center (CDI) of several rural sectors of the Portoviejo canton, having as objective to determine the use of sensory playful corners in the stimulation of children from 1 to 3 years. The results of this work showed that there are no sensory playful corners and that educators lack knowledge about the importance of creating these spaces and making them available to children for their learning, reaching the conclusion that there is a need to create an innovative guide with content sessions, skills, play materials for the corners of visual, auditory, gustatory, olfactory and tactile perception.

Abstract This paper investigates a grid-representation-based approach to spatial cognition for intelligent agents, aiming to develop an effective neural network model that simulates the functions of the olfactory cortex and hippocampus for spatial cognition and navigation. Despite progress made by existing models in simulating biological nervous system functions, issues such as model simplification, lack of biological similarity, and practical application challenges remain. To address these issues, this paper proposes a neural network model that integrates grid representation, reinforcement learning, and encoding/decoding techniques. The model forms a grid representation by simulating the integration of grid cells in the medial entorhinal cortex (MEC) with perceptual information from the lateral entorhinal cortex (LEC), which encodes and retains spatial location information. By leveraging attractor networks, convolutional neural networks (CNNs), and multilayer perceptrons (MLPs), the model achieves the storage of spatial location and environmental information, as well as the construction of cognitive maps. The experimental results show that after using this model, the map generation accuracy increased by 15%, the navigation accuracy of the agent in complex environments by 20%, and the target localization error was reduced to less than 10%, demonstrating a significant overall performance improvement in the grid-based cognitive map construction.

<p> </p><p>Autism spectrum disorder is ranked among the most serious developmental disorders, because it affects multiple areas such as communication, social interactions, establishing and maintaining contacts with the environment, reactions to visual and auditory stimuli and many others. The therapy of these individuals requires multidisciplinary cooperation; therefore, it is currently addressed by many experts. The objective of the paper is to present the possibilities of assessing the influence of speech-language intervention on perceptual-sensory integration in persons with autism spectrum disorder in the context of assessing the pragmatic level of language. This area might be a potential barrier to speech-language intervention; therefore, it should be assessed at the beginning of any intervention.</p><p>The measurement tool for the assessment of perceptual-sensory integration was a test battery of the authors’ own design called ‘Assessment of the pragmatic level of language in persons with autism spectrum disorders: potential barriers to speech-language intervention’. The use of the screening material in the context of speech-language intervention is demonstrated on a case study of a boy with suspected autism spectrum disorder diagnosis – children’s autism with a disorder of sensory perception on the body, especially in the orofacial region. The principal methods were observation, analysis of targeted work with the client and interviews with the parents. According to the case report, the speech-language therapy lasted for nine months and focused on the development of the monitored area. The results can be compared on a global scale, including improvement or stagnation in various areas. The targeted therapy resulted in improvement in all monitored areas by at least 1 point (e.g. olfactory and gustatory perception) and by a maximum of 4 points (vestibular system). After initial examination the boy’s disorder was assessed as moderate to severe disorder (effect to negative effect on the process of learning social interaction). However, based on the results of follow-up examination the boy was in the category of moderate disorder (effect on the process of learning and social interaction).</p>

Numerous impediments beset contemporary art education, notably the unidimensional delivery of content and the absence of real-time interaction during instructional sessions. This study endeavors to surmount these challenges by devising a multimodal perception system entrenched in Internet of Things (IoT) technology. This system captures students’ visual imagery, vocalizations, spatial orientation, movements, ambient luminosity, and contextual data by harnessing an array of interaction modalities encompassing visual, auditory, tactile, and olfactory sensors. The synthesis of this manifold information about learning scenarios entails strategically placing sensors within physical environments to facilitate intuitive and seamless interactions. Utilizing digital art flower cultivation as a quintessential illustration, this investigation formulates tasks imbued with multisensory channel interactions, pushing the boundaries of technological advancement. It pioneers advancements in critical domains such as visual feature extraction by utilizing DenseNet networks and voice feature extraction leveraging SoundNet convolutional neural networks. This innovative paradigm establishes a novel art pedagogical framework, accentuating the importance of visual stimuli while enlisting other senses as complementary contributors. Subsequent evaluation of the usability of the multimodal perceptual interaction system reveals a remarkable task recognition accuracy of 96.15% through the amalgamation of Mel-frequency cepstral coefficients (MFCC) speech features with a long-short-term memory (LSTM) classifier model, accompanied by an average response time of merely 6.453 seconds—significantly outperforming comparable models. The system notably enhances experiential fidelity, realism, interactivity, and content depth, ameliorating the limitations inherent in solitary sensory interactions. This augmentation markedly elevates the caliber of art pedagogy and augments learning efficacy, thereby effectuating an optimization of art education.

Current views of odorant discrimination by the mammalian olfactory system suggest that the piriform cortex serves as a site of odor object synthesis. Given the enormous number of odorant feature combinations possible in nature, however, it seems unlikely that cortical synthetic receptive fields (RFs) are innate but rather require experience for their formation. The present experiment addressed two issues. First, we made a direct comparison of mitral/tufted cell and anterior piriform cortex (aPCX) neuron abilities to discriminate odorant mixtures from their components to further test whether aPCX neurons can treat collections of features different from the features themselves (synthetic coding). Second, we attempted to determine the minimum duration of experience necessary for formation of cortical synthetic RFs. Single-unit recordings were made from mitral/tufted cells and aPCX layer II/III neurons in urethan-anesthetized rats. Cross-habituation between novel binary mixtures and their novel components was used to determine odor discrimination abilities. The results suggest that after ≥50 s of experience with a binary mixture, aPCX neurons can discriminate the mixture from its components, whereas mitral/tufted cells cannot. However, when limited to 10 s of experience with the mixture, aPCX neurons appear similar to mitral/tufted cells and do not discriminate mixtures from components. These results suggest experience-dependent synthetic processing in aPCX and suggest an important role for perceptual learning in normal odor discrimination.

Computer simulations of layers I and II of pirifonn (olfactory) cortex indicate that this biological network can generate a series of distinct output responses to individual stimuli, such that different responses encode different levels of information about a stimulus. In particular, after learning a set of stimuli modeled after distinct groups of odors, the simulated network's initial response to a cue indicates only its group or category, whereas subsequent responses to the same stimulus successively subdivide the group into increasingly specific encoding of the individual cue. These sequences of responses amount to an automated organization of perceptual memories according to both their similarities and differences, facilitating transfer of learned information to novel stimuli without loss of specific information about exceptions. Human recognition performance robustly exhibits such multiple levels: a given object can be identified as a vehicle, as an automobile, or as a Mustang. The findings reported here suggest that a function as apparently complex as hierarchical recognition memory, which seems suggestive of higher ‘cognitive’ processes, may be a fundamental intrinsic property of the operation of this single cortical cell layer in response to naturally-occurring inputs to the structure. We offer the hypothesis that the network function of superficial cerebral conical layers may simultaneously acquire and hierarchically organize information about the similarities and differences among perceived stimuli. Experimental manipulation of the simulation has generated hypotheses of direct links between the values of specific biological features and particular attributes of behavior, generating testable physiological and behavioral predictions.

<abstract><p>Odor is central to food quality. Still, a major challenge is to understand how the odorants present in a given food contribute to its specific odor profile, and how to predict this olfactory outcome from the chemical composition. In this proof-of-concept study, we seek to develop an integrative model that combines expert knowledge, fuzzy logic, and machine learning to predict the quantitative odor description of complex mixtures of odorants. The model output is the intensity of relevant odor sensory attributes calculated on the basis of the content in odor-active comounds. The core of the model is the mathematically formalized knowledge of four senior flavorists, which provided a set of optimized rules describing the sensory-relevant combinations of odor qualities the experts have in mind to elaborate the target odor sensory attributes. The model first queries analytical and sensory databases in order to standardize, homogenize, and quantitatively code the odor descriptors of the odorants. Then the standardized odor descriptors are translated into a limited number of odor qualities used by the experts thanks to an ontology. A third step consists of aggregating all the information in terms of odor qualities across all the odorants found in a given product. The final step is a set of knowledge-based fuzzy membership functions representing the flavorist expertise and ensuring the prediction of the intensity of the target odor sensory descriptors on the basis of the products' aggregated odor qualities; several methods of optimization of the fuzzy membership functions have been tested. Finally, the model was applied to predict the odor profile of 16 red wines from two grape varieties for which the content in odorants was available. The results showed that the model can predict the perceptual outcome of food odor with a certain level of accuracy, and may also provide insights into combinations of odorants not mentioned by the experts.</p></abstract>

The article is devoted to highlighting the features of sensory integration manifestation in childhood and its significance for the holistic development of the child. This includes uncovering the characteristics and patterns of mental development during childhood, describing the main stages of sensory integration development in ontogenesis, and examining sensory integration disorders and the application of sensory integrative therapy with children. A review of foreign and domestic literature on the research problem has shown that there is a growing interest in sensory integration in modern psychology as the foundation for a child's holistic development. Sensory integration is a process occurring in the brain that organizes information received through the senses (vision, hearing, touch, smell, taste), gives meaning to these sensations by filtering information, selecting what to focus on, and enabling us to act and react thoughtfully to the situation we are in. It also forms the basis for theoretical learning and social behavior. The harmonious development of a child depends on the coordinated functioning of all sensory systems. The article explores the features and patterns of mental development in childhood, such as heterochrony, asynchrony, staging, differentiation, and integration of mental processes and properties, as well as changes in the determinants of mental development and plasticity. The main stages of sensory integration development in ontogenesis are also examined. The importance of the sensory-perceptual sphere in a child’s development is underscored, as sensory development is the foundation of a child’s intellectual growth. Sensory development involves the development of sensations and perceptions, as well as the understanding of objects' forms, colors, sizes, and spatial locations, as well as the objects and phenomena of the surrounding world. Perception is formed based on the synthesis of various sensations: visual, auditory, tactile, kinesthetic, olfactory, and others. Perception reflects the objectivity, integrity, structure, constancy of objects, and others. Early childhood is the most favorable period for the improvement of sensory organ functions and the accumulation of representations about the surrounding world. Knowledge of the surrounding reality in children begins with the analysis of information received through touch, visual observation, sounds, smells, various tastes, and so on. It has been established that childhood plays a crucial role in sensory integration, as a child organizes not only visual and auditory sensations but also the sensations of their own body and the force of gravity, which contributes to the child’s holistic development. A significant portion of a child’s learning ability lies in their ability to integrate sensory information, as learning depends on the ability to perceive and process sensations from their movements and external influences and to use this information for planning and organizing behavior. It has been found that sensory integration facilitates the development of motor skills, movement coordination, spatial orientation, and visual and auditory perception, particularly by filtering and organizing information to help the child focus on solving specific tasks. Moreover, sensory integration contributes to the development of cognitive mental processes: attention, memory, thinking, and speech. Sensory integration also enhances a child's adaptation to the environment, social interaction, communication, and the formation of independence and curiosity in the child. Sensory integration disorders (hyposensitivity and hypersensitivity of sensory systems) have been analyzed, and the main principles of sensory-integrative therapy with children have been outlined. Children with reduced sensory processing abilities often experience difficulties in carrying out voluntary actions, which in turn can affect learning and behavior. Therefore, sensory-integrated therapy aimed at developing and integrating sensations contributes to improving the child’s learning and behavior. In conclusion, sensory integration is of great importance for child development.

Abstract The sense of smell is based on sensory detection of the molecule(s), which is then further perceptually interpreted. A possible measure of olfactory perception is an odor independent olfactory perceptual fingerprint (OPF) defined by Snitz et al. We aimed to investigate, whether OPF can distinguish patients with olfactory dysfunction due to COVID-19 from controls and which perceptual descriptors are important for that separation. Our study included 99 healthy controls and 41 patients. They rated ten odors using eight descriptors 'pleasant', 'intense', 'familiar', 'warm', 'cold', 'irritating', ‘edible', and ‘disgusting'. An unsupervised machine learning method, hierarchical cluster analysis, showed that OPF can distinguish patients from controls with accuracy of 83%, sensitivity of 51%, and specificity of 96%. Furthermore, a supervised machine learning method, random forest classifier, showed that OPF can distinguish patients and controls in the testing dataset with accuracy of 86%, sensitivity of 64%, and specificity of 96%. Principal component analysis and random forest classifier showed that familiarity and intensity were the key qualities to explain the variance of the data. In conclusion, people with COVID-related olfactory dysfunction have a fundamentally different olfactory perception.

AbstractDiminished sense of smell impairs the quality of life but olfactorily disabled people are hardly considered in measures of disability inclusion. We aimed to stratify perceptual characteristics and odors according to the extent to which they are perceived differently with reduced sense of smell, as a possible basis for creating olfactory experiences that are enjoyed in a similar way by subjects with normal or impaired olfactory function. In 146 subjects with normal or reduced olfactory function, perceptual characteristics (edibility, intensity, irritation, temperature, familiarity, hedonics, painfulness) were tested for four sets of 10 different odors each. Data were analyzed with (i) a projection based on principal component analysis and (ii) the training of a machine-learning algorithm in a 1000-fold cross-validated setting to distinguish between olfactory diagnosis based on odor property ratings. Both analytical approaches identified perceived intensity and familiarity with the odor as discriminating characteristics between olfactory diagnoses, while evoked pain sensation and perceived temperature were not discriminating, followed by edibility. Two disjoint sets of odors were identified, i.e., d = 4 “discriminating odors” with respect to olfactory diagnosis, including cis-3-hexenol, methyl salicylate, 1-butanol and cineole, and d = 7 “non-discriminating odors”, including benzyl acetate, heptanal, 4-ethyl-octanoic acid, methional, isobutyric acid, 4-decanolide and p-cresol. Different weightings of the perceptual properties of odors with normal or reduced sense of smell indicate possibilities to create sensory experiences such as food, meals or scents that by emphasizing trigeminal perceptions can be enjoyed by both normosmic and hyposmic individuals.

The ability to consistently recognize an object despite variable sensory input is termed perceptual constancy. This ability is not innate; rather, it develops with experience early in life. We show that, when mice are naïve to an odor object, perceptual constancy is absent across increasing concentrations. The perceptual change coincides with a rapid reduction in activity from a single olfactory receptor channel that is most sensitive to the odor. This drop in activity is not a property of circuit interactions within the olfactory bulb; instead, it is due to a sensitivity mismatch of olfactory receptor neurons within the nose. We show that, after forming an association of this odor with food, the sensitivity of the receptor channel is matched to the odor object, preventing transmission failure and promoting perceptual stability. These data show that plasticity of the primary sensory organ enables learning of perceptual constancy.

AbstractObjective(s)An olfactory perceptual fingerprint (OPF) defines one's olfactory perception using perceptual descriptor ratings (such as odor pleasantness, intensity) for a set of odors. OPFs have been shown to distinguish patients with COVID‐related olfactory dysfunction (OD) and healthy controls with 86% accuracy. However, all participants rated the same odorants. With the aim to evaluate whether the OPFs are indeed odorant independent, previously published dataset by Lötsch et al. was reanalyzed. Furthermore, this independent dataset was used to check whether the OPFs separate patients with OD due to various causes from controls.MethodsThe study included 104 controls and 42 patients, who were randomized into four odor sets with 10 odorants each. Odorants were presented using a computer‐controlled olfactometer and evaluated on scales from 1 (not at all) to 5 (very) using perceptual descriptors pleasant, intensive, familiar, edible, irritating, cold/warm, and painful.ResultsPermutational multivariate analysis of variance showed that the odor set did not have a significant effect on the OPFs, confirming that the OPFs are indeed odorant independent. On the other hand, both diagnosis and age affected the OPFs (p < .001) and explained around 11% and 5% of the variance of the OPFs, respectively. Furthermore, a supervised machine learning method, random forest classifier, showed that OPF can distinguish patients and controls with 80% accuracy.ConclusionOPFs are odorant independent. Patients perceived odors as less familiar, less intense, and less edible than controls. Other perceptual descriptors were much less important for the separation of patients and controls.Level of evidence3

AbstractPredicting olfactory perceptions from odorant molecules is challenging due to the complex and potentially discontinuous nature of the perceptual space for smells. In this study, we introduce a deep learning model, Mol-PECO (Molecular Representation by Positional Encoding of Coulomb Matrix), designed to predict olfactory perceptions based on molecular structures and electrostatics. Mol-PECO learns the efficient embedding of molecules by utilizing the Coulomb matrix, which encodes atomic coordinates and charges, as an alternative of the adjacency matrix and its Laplacian eigenfunctions as positional encoding of atoms. With a comprehensive dataset of odor molecules and descriptors, Mol-PECO outperforms traditional machine learning methods using molecular fingerprints and graph neural networks based on adjacency matrices. The learned embeddings by Mol-PECO effectively capture the odor space, enabling global clustering of descriptors and local retrieval of similar odorants. This work contributes to a deeper understanding of the olfactory sense and its mechanisms.

Abstract The fundamental units of olfactory perception are discrete 3D structures of volatile chemicals that each interact with specific subsets of a very large family of hundreds of odorant receptor proteins, in turn activating complex neural circuitry and posing a challenge to understand. We have applied computational approaches to analyze olfactory perceptual space from the perspective of odorant chemical features. We identify physicochemical features associated with ~150 different perceptual descriptors and develop machine-learning models. Validation of predictions shows a high success rate for test set chemicals within a study, as well as across studies more than 30 years apart in time. Due to the high success rates, we are able to map ~150 percepts onto a chemical space of nearly 0.5 million compounds, predicting numerous percept–structure combinations. The chemical structure-to-percept prediction provides a system-level view of human olfaction and opens the door for comprehensive computational discovery of fragrances and flavors.

AbstractDuring the olfactory perception process, our olfactory receptors are thought to recognize specific chemical features. These features may contribute towards explaining our crossmodal perception. The physicochemical features of odors can be extracted using an array of gas sensors, also known as an electronic nose. The present study investigates the role that the physicochemical features of olfactory stimuli play in explaining the nature and origin of olfactory crossmodal correspondences, which is a consistently overlooked aspect of prior work. Here, we answer the question of whether the physicochemical features of odors contribute towards explaining olfactory crossmodal correspondences and by how much. We found a similarity of 49% between the perceptual and the physicochemical spaces of our odors. All of our explored crossmodal correspondences namely, the angularity of shapes, smoothness of textures, perceived pleasantness, pitch, and colors have significant predictors for various physicochemical features, including aspects of intensity and odor quality. While it is generally recognized that olfactory perception is strongly shaped by context, experience, and learning, our findings show that a link, albeit small (6–23%), exists between olfactory crossmodal correspondences and their underlying physicochemical features.

Concept learning highly depends on multisensory integration. In this study, we propose a multisensory concept learning framework based on brain-inspired spiking neural networks to create integrated vectors relying on the concept's perceptual strength of auditory, gustatory, haptic, olfactory, and visual. With different assumptions, two paradigms: Independent Merge (IM) and Associate Merge (AM) are designed in the framework. For testing, we employed eight distinct neural models and three multisensory representation datasets. The experiments show that integrated vectors are closer to human beings than the non-integrated ones. Furthermore, we systematically analyze the similarities and differences between IM and AM paradigms and validate the generality of our framework.

Abstract Although orthonasal odorants are often associated with the external environment, retronasal odorants are accompanied by consummatory behaviors and indicate an internal state of an animal. Our study aimed to examine whether the same odorants may generate a consistent perceptual experience when 2 olfactory routes potentiate variations in concentration in the nasal cavity and orosensory activation. A customized lick spout with vacuum removing odorants around the animal’s nares was used to render a pure retronasal exposure experience. We found that pre-exposing rats to odorants retronasally with positive or negative reinforcers (sweet or bitter) lead to a significant learning rate difference between high- and low-vapor-pressure odorants. This effect was not observed for novel odorants, suggesting that odorants may generate similar perceptual quality in a volatility-dependent manner.

AbstractEarly life adversity (ELA) causes aberrant functioning of neural circuits affecting the health of an individual. While ELA-induced behavioural disorders resulting from sensory and cognitive disabilities can be assessed clinically, the neural mechanisms need to be probed using animal models by employing multi-pronged experimental approaches. As ELA can alter sensory perception, we investigated the effect of early weaning on murine olfaction. By implementing go/no-go odour discrimination paradigm, we observed olfactory learning and memory impairments in early life stressed (ELS) male mice. As olfactory bulb (OB) circuitry plays a critical role in odour learning, we studied the plausible changes in the OB of ELS mice. Lowered c-Fos activity in the external plexiform layer and a reduction in the number of dendritic processes of somatostatin-releasing, GABAergic interneurons (SOM-INs) in the ELS mice led us to hypothesise the underlying circuit. We recorded reduced synaptic inhibitory feedback on mitral/tufted (M/T) cells, in the OB slices from ELS mice, explaining the learning deficiency caused by compromised refinement of OB output. The reduction in synaptic inhibition was nullified by the photo-activation of ChR2-expressing SOM-INs in ELS mice. The role of SOM-INs was revealed by learning-dependent refinement of Ca2+dynamics quantified by GCaMP6f signals, which was absent in ELS mice. Further, the causal role of SOM-INs involving circuitry was investigated by optogenetic modulation during the odour discrimination learning. Photo-activating these neurons rescued the ELA-induced learning deficits. Conversely, photo-inhibition caused learning deficiency in control animals, while it completely abolished the learning in ELS mice, confirming the adverse effects mediated by SOM-INs. Our results thus establish the role of specific inhibitory circuit in pre-cortical sensory area in orchestrating ELA-dependent changes.

Practice makes perfect. In human olfaction, such plasticity is generally assumed to occur at the level of cortical synthetic processing that shares information from both nostrils. Here we present findings that challenge this view. In two experiments, we trained human adults unirhinally for the discrimination between odor enantiomers over a course of about 10 to 11 days. Results showed that training-induced perceptual gain was restricted to the trained nostril yet partially generalized to untrained odor enantiomers in a structure- rather than quality- based manner. In other words, learning enhanced the differentiation of chirality (molecular configuration) as opposed to overall odor quality (odor object) per se. These findings argue that, unlike earlier beliefs, one nostril does not readily know what the other learns. Moreover, the initial analytical processing of the structural features of uninarial olfactory input remains plastic in human adults.

Abstract Color and pitch perception are largely understandable from characteristics of physical stimuli: the wavelengths of light and sound waves, respectively. By contrast, understanding olfactory percepts from odorous stimuli (volatile molecules) is much more challenging. No intuitive set of molecular features is up to the task. Here in Chemical Senses, the Ray lab reports using a predictive modeling framework—first breaking molecular structure into thousands of features and then using this to train a predictive statistical model on a wide range of perceptual descriptors—to create a tool for predicting the odor character of hundreds of thousands of available but previously uncharacterized molecules (Kowalewski et al. 2021). This will allow future investigators to representatively sample the space of odorous molecules as well as identify previously unknown odorants with a target odor character. Here, I put this work into the context of other modeling efforts and highlight the urgent need for large new datasets and transparent benchmarks for the field to make and evaluate modeling breakthroughs, respectively.

AbstractFor many odors that we encounter in daily life, we perceive their qualities without being able to specifically identify their sources—an experience termed the “tip-of-the-nose” phenomenon. Does learning an odor’s identity alter our experience of it? Past work has shown that labeling odors can alter how we describe and react to them, but it remains an open question whether such changes extend to the level of perception, making an odor actually smell different. Here, in a set of odor classification experiments we tested whether attaching labels to odors can alter their perceptual discriminability. We found that even for odors whose reported similarity changed markedly when their identities were revealed, their discriminability remained unchanged by labels. Our findings indicate that two critical functions of olfaction—parsing the odor environment and supporting the subjective experience of odor qualities—access distinct odor representations within the olfactory processing stream.

Learning and memory are fundamental processes, influencing animal foraging behaviour and fitness success. Evaluating food nutritional quality, particularly of proteins and essential amino acids, involves complex sensory mechanisms. While olfactory cues have been extensively studied, less is known about proteinaceous chemoreception, especially in invertebrates. Vespula germanica, a globally invasive social wasp species, relies heavily on foraging efficiency and nutritional assessment for colony success. Previous studies have highlighted their associative learning abilities in natural settings, but their cognitive capabilities under laboratory conditions still need to be explored. We investigated the perceptual and learning abilities of V. germanica concerning amino acids using a maxilla-labium extension response (MaLER) conditioning protocol. We aimed to determine whether these wasps can (1) perceive specific amino acids through antennal chemoreception, (2) perform associative learning with amino acids, (3) discriminate between stimuli of varying molecular and nutritional profiles, and (4) generalize among similar stimuli. Our results suggest that V. germanica can detect free amino acids and exhibit associative learning toward them. They can discriminate between amino acids with different profiles and do not generalize among similar compounds. These findings indicate that V. germanica foragers can qualitatively evaluate amino acid solutions, translating into a natural ability to discern and learn from food sources with varying nutritional qualities. This knowledge could enhance management strategies for this invasive species, which relies on poisoned beef-based baits. Understanding the sensory and cognitive capabilities of V. germanica provides a foundation for developing more effective control methods.

It has been suggested that the thalamus acts as a blackboard, on which the computations of different cortical modules are composed, coordinated, and integrated. This article asks what blackboard role the thalamus might play, and whether that role is consistent with the neuroanatomy of the thalamus. It does so in a context of Bayesian belief updating, expressed as a Free Energy Principle. We suggest that the thalamus-as-a-blackboard offers important questions for research in spatial cognition. Several prominent features of the thalamus—including its lack of olfactory relay function, its lack of internal excitatory connections, its regular and conserved shape, its inhibitory interneurons, triadic synapses, and diffuse cortical connectivity—are consistent with a blackboard role.Different thalamic nuclei may play different blackboard roles: (1) the Pulvinar, through its reciprocal connections to posterior cortical regions, coordinates perceptual inference about “what is where” from multi-sense-data. (2) The Mediodorsal (MD) nucleus, through its connections to the prefrontal cortex, and the other thalamic nuclei linked to the motor cortex, uses the same generative model for planning and learning novel spatial movements. (3) The paraventricular nucleus may compute risk-reward trade-offs. We also propose that as any new movement is practiced a few times, cortico-thalamocortical (CTC) links entrain the corresponding cortico-cortical links, through a process akin to supervised learning. Subsequently, the movement becomes a fast unconscious habit, not requiring the MD nucleus or other thalamic nuclei, and bypassing the thalamic bottleneck.

Prior attempts at forming theoretical predictions regarding the quality of binary odor mixtures have failed to find any consistent predictor for overshadowing of one component in a binary mixture by the other. We test here the hypothesis that trigeminality contributes to overshadowing effects in binary mixture perception. Most odorants stimulate the trigeminal nerve in the nasal sensory epithelium. In the current study we test rats’ ability to detect component odorants in four binary odor sets chosen for their relative trigeminality. We predicted that the difference in trigeminal intensity would predict the degree of overshadowing by boosting or suppressing perceptual intensity of these odorants during learning or during mixture perception. We used a two-alternative choice (TAC) task in which rats were trained to recognize the two components of each mixture and tested on a range of mixtures of the two without reinforcement. We found that even though odorant concentrations were adjusted to balance volatility, all odor sets produced asymmetric psychometric curves. Odor pairs with the greatest difference in trigeminality showed overshadowing by the odorant with weaker trigeminal properties. Odor sets with more evenly matched trigeminal properties also showed asymmetry that was not predicted by either small differences in volatility or trigeminality. Thus, trigeminal properties may influence overshadowing in odor mixtures, but other factors are also likely involved. These mixed results further support the need to test each odor mixture to determine its odor quality and underscore recent results at the level of olfactory receptor neurons that show massive and unpredictable inhibition among odorants in complex mixtures.

The debate on the social role of museums trundles along in an age where complex associations between community, collections, and cultural norms are highly contested (Silverman 3–4; Sandell, Inequality 3–23). This article questions whether, in the case of community groups whose aspirations often go unrecognised (in this case people with either blindness or low vision), there is a need to discuss and debate institutionalised approaches that often reinforce social exclusion and impede cultural access. If “access is [indeed] an entry point to experience” (Papalia), then the privileging of visual encounters in museums is clearly a barrier for people who experience sight loss or low vision (Levent and Pursley). In contrast, a multisensory aesthetic to exhibition display respects the gamut of human sensory experience (Dudley 161–63; Drobnick 268–69; Feld 184; James 136; McGlone 41–60) as do discursive gateways including “lectures, symposia, workshops, educational programs, audio guides, and websites” (Cachia). Independent access to information extends beyond Braille on toilet doors.Underpinning this article is an ongoing qualitative case study undertaken by the author involving participant observation, workshops, and interviews with eight adults who experience vision impairment. The primary research site has been the National Museum of Australia. Reflecting on the role of curators as storytellers and the historical development of museums and their practitioners as agents for social development, the article explores the opportunities latent in museum collections as they relate to community members with vision impairment. The outcomes of this investigation offer insights into emerging issues as they relate to the International Council of Museums (ICOM) definitions of the museum program. Curators as Storytellers“The ways in which objects are selected, put together, and written or spoken about have political effects” (Eilean Hooper-Greenhill qtd. in Sandell, Inequality 8). Curators can therefore open or close doors to discrete communities of people. The traditional role of curators has been to collect, care for, research, and interpret collections (Desvallées and Mairesse 68): they are characterised as information specialists with a penchant for research (Belcher 78). While commonly possessing an intimate knowledge of their institution’s collection, their mode of knowledge production results from a culturally mediated process which ensures that resulting products, such as cultural significance assessments and provenance determinations (Russell and Winkworth), privilege the knowing systems of dominant social groups (Fleming 213). Such ways of seeing can obstruct the access prospects of underserved audiences.When it comes to exhibition display—arguably the most public of work by museums—curators conventionally collaborate within a constellation of other practitioners (Belcher 78–79). Curators liaise with museum directors, converse with conservators, negotiate with exhibition designers, consult with graphics designers, confer with marketing boffins, seek advice from security, chat with editors, and engage with external contractors. I question the extent that curators engage with community groups who may harbour aspirations to participate in the exhibition experience—a sticking point soon to be addressed. Despite the team based ethos of exhibition design, it is nonetheless the content knowledge of curators on public display. The art of curatorial interpretation sets out not to instruct audiences but, in part, to provoke a response with narratives designed to reveal meanings and relationships (Freeman Tilden qtd. in Alexander and Alexander 258). Recognised within the institution as experts (Sandell, Inclusion 53), curators have agency—they decide upon the stories told. In a recent television campaign by the National Museum of Australia, a voiceover announces: a storyteller holds incredible power to connect and to heal, because stories bring us together (emphasis added). (National Museum of Australia 2015)Storytelling in the space of the museum often shares the histories, perspectives, and experiences of people past as well as living cultures—and these stories are situated in space and time. If that physical space is not fit-for-purpose—that is, it does not accommodate an individual’s physical, intellectual, psychiatric, sensory, or neurological needs (Disability Discrimination Act 1992, Cwlth)—then the story reaches only long-established patrons. The museum’s opportunity to contribute to social development, and thus the curator’s as the primary storyteller, will have been missed. A Latin-American PerspectiveICOM’s commitment to social development could be interpreted merely as a pledge to make use of collections to benefit the public through scholarship, learning, and pleasure (ICOM 15). If this interpretation is accepted, however, then any museum’s contribution to social development is somewhat paltry. To accept such a limited and limiting role for museums is to overlook the historical efforts by advocates to change the very nature of museums. The ascendancy of the social potential of museums first blossomed during the late 1960s at a time where, globally, overlapping social movements espoused civil rights and the recognition of minority groups (Silverman 12; de Varine 3). Simultaneously but independently, neighbourhood museums arose in the United States, ecomuseums in France and Quebec, and the integral museum in Latin America, notably in Mexico (Hauenschild; Silverman 12–13). The Latin-American commitment to the ideals of the integral museum developed out of the 1972 round table of Santiago, Chile, sponsored by the United Nations Educational, Scientific and Cultural Organization (Giménez-Cassina 25–26). The Latin-American signatories urged the local and regional museums of their respective countries to collaborate with their communities to resolve issues of social inequality (Round Table Santiago 13–21). The influence of Brazilian educator Paulo Freire should be acknowledged. In 1970, Freire ushered in the concept of conscientization, defined by Catherine Campbell and Sandra Jovchelovitch as:the process whereby critical thinking develops … [and results in a] … thinker [who] feels empowered to think and to act on the conditions that shape her living. (259–260)This model for empowerment lent inspiration to the ideals of the Santiago signatories in realising their sociopolitical goal of the integral museum (Assunção dos Santos 20). Reframing the museum as an institution in the service of society, the champions of the integral museum sought to redefine the thinking and practices of museums and their practitioners (United Nations Educational, Scientific and Cultural Organization 37–39). The signatories successfully lobbied ICOM to introduce an explicitly social purpose to the work of museums (Assunção dos Santos 6). In 1974, in the wake of the Santiago round table, ICOM modified their definition of a museum to “a permanent non-profit institution, open to the public, in the service of society and its development” (emphasis added) (Hauenschild). Museums had been transformed into “problem solvers” (Judite Primo qtd. in Giménez-Cassina 26). With that spirit in mind, museum practitioners, including curators, can develop opportunities for reciprocity with the many faces of the public (Guarini). Response to Social Development InitiativesStarting in the 1970s, the “second museum revolution” (van Mensch 6–7) saw the transition away from: traditional roles of museums [of] collecting, conservation, curatorship, research and communication … [and toward the] … potential role of museums in society, in education and cultural action. (van Mensch 6–7)Arguably, this potential remains a work in progress some 50 years later. Writing in the tradition of museums as agents of social development, Mariana Lamas states:when we talk about “in the service of society and its development”, it’s quite different. It is like the drunk uncle at the Christmas party that the family pretends is not there, because if they pretend long enough, he might pass out on the couch. (Lamas 47–48)That is not to say that museums have neglected to initiate services and programs that acknowledge the aspirations of people with disabilities (refer to Cachia and Krantz as examples). Without discounting such efforts, but with the refreshing analogy of the drunken uncle still fresh in memory, Lamas answers her own rhetorical question:how can traditional museums promote community development? At first the word “development” may seem too much for the museum to do, but there are several ways a museum can promote community development. (Lamas 52) Legitimising CommunitiesThe first way that museums can foster community or social development is to:help the community to over come [sic] a problem, coming up with different solutions, putting things into a new perspective; providing confidence to the community and legitimizing it. (Lamas 52)As a response, my doctoral investigation legitimises the right of people with vision impairment to participate in the social and cultural aspects of publicly funded museums. The Australian Government upheld this right in 2008 by ratifying the United Nations Convention on the Rights of Persons with Disabilities (and Optional Protocol), which enshrines the right of people with disability to participate in the cultural life of the nation (United Nations).At least 840,700 people in Australia (a minimum of four per cent of the population) experiences either blindness or low vision (Australian Bureau of Statistics 2009). For every one person in the Australian community who is blind, nearly five other people experience low vision. The medical model of disability identifies the impairment as the key feature of a person and seeks out a corrective intervention. In contrast, the social model of disability strives to remove the attitudinal, social, and physical barriers enacted by people or institutions (Landman, Fishburn, and Tonkin 14). Therein lies the opportunity and challenge for museums—modifying layouts and practices that privilege the visual. Consequently, there is scope for museums to partner with people with vision impairment to identify their aspirations rather than respond as a problem to be fixed. Common fixes in the museums for people with disabilities include physical alterations such as ramps and, less often, special tours (Cachia). I posit that curators, as co-creators and major contributors to exhibitions, can be part of a far wider discussion. In the course of doctoral research, I accompanied adults with a wide array of sight impairments into exhibitions at the Museum of Australian Democracy at Old Parliament House, the Australian War Memorial, and the National Museum of Australia. Within the space of the exhibition, the most commonly identified barrier has been the omission of access opportunities to interpreted materials: that is, information about objects on display as well as the wider narratives driving exhibitions. Often, the participant has had to work backwards, from the object itself, to understand the wider topic of the exhibition. If aesthetics is “the way we communicate through the senses” (Thrift 291), then the vast majority of exhibits have been inaccessible from a sensory perspective. For people with low vision (that is, they retain some degree of functioning sight), objects’ labels have often been too small to be read or, at times, poorly contrasted or positioned. Objects have often been set too deep into display cabinets or too far behind safety barriers. If individuals must use personal magnifiers to read text or look in vain at objects, then that is an indicator that there are issues with exhibition design. For people who experience blindness (that is, they cannot see), neither the vast majority of exhibits nor their interpretations have been made accessible. There has been minimal access across all museums to accessioned objects, handling collections, or replicas to tease out exhibits and their stories. Object labels must be read by family or friends—a tiring experience. Without motivated peers, the stories told by curators are silenced by a dearth of alternative options.Rather than presume to know what works for people with disabilities, my research ethos respects the “nothing about us without us” (Charlton 2000; Werner 1997) maxim of disability advocates. To paraphrase Lamas, we have collaborated to come up with different solutions by putting things into new perspectives. In turn, “person-centred” practices based on rapport, warmth, and respect (Arigho 206–07) provide confidence to a diverse community of people by legitimising their right to participate in the museum space. Incentivising Communities Museums can also nurture social or community development by providing incentives to “the community to take action to improve its quality of life” (Lamas 52). It typically falls to (enthusiastic) public education and community outreach teams to engage underserved communities through targeted programs. This approach continues the trend of curators as advocates for the collection, and educators as advocates for the public (Kaitavouri xi). If the exhibition briefs normally written by curators (Belcher 83) reinforced the importance of access, then exhibition designers would be compelled to offer fit-for-purpose solutions. Better still, if curators (and other exhibition team members) regularly met with community based organisations (perhaps in the form of a disability reference group), then museums would be better positioned to accommodate a wider spectrum of community members. The National Standards for Australian Museums and Galleries already encourages museums to collaborate with disability organisations (40). Such initiatives offer a way forward for improving a community’s sense of itself and its quality of life. The World Health Organization defines health as a “state of complete physical, mental and social well-being and not merely the absence of disease or infirmity”. While I am not using quality of life indicators for my doctoral study, the value of facilitating social and cultural opportunities for my target audience is evident in participant statements. At the conclusion of one sensory based workshop, Mara, a female participant who experiences low vision in one eye and blindness in the other, stated:I think it was interesting in that we could talk together about what we were experiencing and that really is the social aspect of it. I mean if I was left to go to a whole lot of museums on my own, I probably wouldn’t. You know, I like going with kids or a friend visiting from interstate—that sort of thing. And so this group, in a way, replicates that experience in that you’ve got someone else to talk about your impressions with—much better than going on your own or doing this alone.Mara’s statement was in response to one of two workshops I held with the support of the Learning Services team at the National Museum of Australia in May 2015. Selected objects from the museum’s accessioned collection and handling collection were explored, as well as replicas in the form of 3D printed objects. For example, participants gazed upon and handled a tuckerbox, smelt and tasted macadamia nuts in wattle seed syrup, and listened to a genesis story about the more-ish nut recorded by the Butchulla people—the traditional owners of Fraser Island. We sat around a table while I, as the workshop mediator, sought to facilitate free-flowing discussions about their experiences and, in turn, mused on the capacity of objects to spark social connection and opportunities for cultural access. While the workshop provided the opportunity for reciprocal exchanges amongst participants as well as between participants and me, what was highly valued by most participants was the direct contact with members of the museum’s Learning Services team. I observed that participants welcomed the opportunity to talk with real museum workers. Their experience of museum practitioners, to date, had been largely confined to the welcome desk of respective institutions or through special events or tours where they were talked at. The opportunity to communicate directly with the museum allowed some participants to share their thoughts and feelings about the services that museums provide. I suggest that curators open themselves up to such exchanges on a more frequent basis—it may result in reciprocal benefits for all stakeholders. Fortifying IdentityA third way museums can contribute to social or community development is by:fortify[ing] the bonds between the members of the community and reaffirm their identities making them feel more secure about who they are; and give them a chance to tell their own version of their history to “outsiders” which empowers them. (Lamas 52)Identity informs us and others of who we are and where we belong in the world (Silverman 54). However, the process of identity marking and making can be fraught: “some communities are ours by choice … [and] … some are ours because of the ways that others see us” (Watson 4). Communities are formed by identifying who is in and who is out (Francois Dubet qtd. in Bessant and Watts 260). In other words, the construction of collective identity is reinforced through means of social inclusion and social exclusion. The participants of my study, as members or clients of the Royal Society for the Blind | Canberra Blind Society, clearly value participating in events with empathetic peers. People with vision impairment are not a homogenous group, however. Reinforcing the cultural influences on the formation of identity, Fiona Candlin asserts that “to state the obvious but often ignored fact, blind people … [come] … from all social classes, all cultural, racial, religious and educational backgrounds” (101). Irrespective of whether blindness or low vision arises congenitally, adventitiously, or through unexpected illness, injury, or trauma, the end result is an assortment of individuals with differing perceptual characteristics who construct meaning in often divergent ways (De Coster and Loots 326–34). They also hold differing world views. Therefore, “participation [at the museum] is not an end in itself. It is a means for creating a better world” (Assunção dos Santos 9). According to the Australian Human Rights Commissioner, Professor Gillian Triggs, a better world is: a society for all, in which every individual has an active role to play. Such a society is based on fundamental values of equity, equality, social justice, and human rights and freedoms, as well as on the principles of tolerance and embracing diversity. (Triggs)Publicly funded museums can play a fundamental role in the cultural lives of societies. For example, the Powerhouse Museum (Museum of Applied Arts and Sciences) in Sydney partnered with Vision Australia to host an exhibition in 2010 titled Living in a Sensory World: it offered “visitors an understanding of the world of the blindness and low vision community and celebrates their achievements” (Powerhouse Museum). With similar intent, my doctoral research seeks to validate the world of my participants by inviting museums to appreciate their aspirations as a distinct but diverse community of people. ConclusionIn conclusion, the challenge for museum curators and other museum practitioners is balancing what Richard Sennett (qtd. in Bessant and Watts 265) identifies as opportunities for enhancing social cohesion and a sense of belonging while mitigating parochialism and community divisiveness. Therefore, curators, as the primary focus of this article, are indeed challenged when asked to contribute to serving the public through social development—a public which is anything but homogenous. Mindful of cultural and social differences in an ever-changing world, museums are called to respect the cultural and natural heritage of the communities they serve and collaborate with (ICOM 10). It is a position I wholeheartedly support. This is not to say that museums or indeed curators are capable of solving the ills of society. However, inviting people who are frequently excluded from social and cultural events to multisensory encounters with museum collections acknowledges their cultural rights. I suggest that this would be a seismic shift from the current experiences of adults with blindness or low vision at most museums.ReferencesAlexander, Edward, and Mary Alexander. Museums in Motion: An Introduction to the History and Functions of Museums. 2nd ed. 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