Academic literature on the topic 'Task-determined visual strategy'
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Journal articles on the topic "Task-determined visual strategy"
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Hilbert, Sven, Tristan T. Nakagawa, Patricia Puci, Alexandra Zech, and Markus Bühner. "The Digit Span Backwards Task." European Journal of Psychological Assessment 31, no. 3 (July 2015): 174–80. http://dx.doi.org/10.1027/1015-5759/a000223.
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Abstract. The “digit span backwards” (DSB) is the most commonly used test in clinical neuropsychology to assess working memory capacity. Yet, it remains unclear how the task is solved cognitively. The present study was conducted to examine the use of visual and verbal cognitive strategies in the DSB. Further, the relationship between the DSB and a complex span task, based on the Simultaneous Storage and Processing task ( Oberauer et al., 2003 ), was investigated. Visualizers performed better than verbalizers in the dual task condition (rPB = .23) only when the relevant digits were presented optically. Performance in the DSB correlated only weakly with the complex span task in all conditions (all τ ≤ .21). The results indicate that the processing modality is determined by the preference for a cognitive strategy rather than the presentation modality and suggest that the DSB measures different working aspects than commonly used experimental working memory tasks.
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van Dieën, Jaap H., Marloes van Leeuwen, and Gert S. Faber. "Learning to balance on one leg: motor strategy and sensory weighting." Journal of Neurophysiology 114, no. 5 (November 1, 2015): 2967–82. http://dx.doi.org/10.1152/jn.00434.2015.
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We investigated motor and sensory changes underlying learning of a balance task. Fourteen participants practiced balancing on one leg on a board that could freely rotate in the frontal plane. They performed six, 16-s trials standing on one leg on a stable surface (2 trials without manipulation, 2 with vestibular, and 2 with visual stimulation) and six trials on the balance board before and after a 30-min training. Center of mass (COM) movement, segment, and total angular momenta and board angles were determined. Trials on stable surface were compared with trials after training to assess effects of surface conditions. Trials pretraining and posttraining were compared to assess rapid (between trials pretraining) and slower (before and after training) learning, and sensory manipulation trials were compared with unperturbed trials to assess sensory weighting. COM excursions were larger on the unstable surface but decreased with practice, with the largest improvement over the pretraining trials. Changes in angular momentum contributed more to COM acceleration on the balance board, but with practice this decreased. Visual stimulation increased sway similarly in both surface conditions, while vestibular stimulation increased sway less on the balance board. With practice, the effects of visual and vestibular stimulation increased rapidly. Initially, oscillations of the balance board occurred at 3.5 Hz, which decreased with practice. The initial decrease in sway with practice was associated with upweighting of visual information, while later changes were associated with suppression of oscillations that we suggest are due to too high proprioceptive feedback gains.
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Block, Hannah J., and Amy J. Bastian. "Sensory weighting and realignment: independent compensatory processes." Journal of Neurophysiology 106, no. 1 (July 2011): 59–70. http://dx.doi.org/10.1152/jn.00641.2010.
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When estimating the position of one hand for the purpose of reaching to it with the other, humans have visual and proprioceptive estimates of the target hand's position. These are thought to be weighted and combined to form an integrated estimate in such a way that variance is minimized. If visual and proprioceptive estimates are in disagreement, it may be advantageous for the nervous system to bring them back into register by spatially realigning one or both. It is possible that realignment is determined by weights, in which case the lower-weighted modality should always realign more than the higher-weighted modality. An alternative possibility is that realignment and weighting processes are controlled independently, and either can be used to compensate for a sensory misalignment. Here, we imposed a misalignment between visual and proprioceptive estimates of target hand position in a reaching task designed to allow simultaneous, independent measurement of weights and realignment. In experiment 1, we used endpoint visual feedback to create a situation where task success could theoretically be achieved with either a weighting or realignment strategy, but vision had to be regarded as the correctly aligned modality to achieve success. In experiment 2, no endpoint visual feedback was given. We found that realignment operates independently of weights in the former case but not in the latter case, suggesting that while weighting and realignment may operate in conjunction in some circumstances, they are biologically independent processes that give humans behavioral flexibility in compensating for sensory perturbations.
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Zegarra-Moran, Olga, and Gad Geiger. "Visual Recognition in the Peripheral Field: Letters versus Symbols and Adults versus Children." Perception 22, no. 1 (January 1993): 77–90. http://dx.doi.org/10.1068/p220077.
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The plot of the form-resolving field (FRF) was obtained by tachistoscopically presenting two figures in each stimulus, one in the center of gaze and the other in the peripheral field. The figures in the periphery were placed at various eccentricities in different presentations. The ensuing plot of average letter recognition as a function of eccentricity is the FRF. Only the horizontal components of the FRFs were used in the comparisons. Three sets of figures were used as stimuli: regular-size letters, large-size letters, and symbols. Three groups of subjects were compared: adult ordinary readers, reading children, and pre-reading-age children. The last were tested with symbols only. In letter recognition, the FRFs for young and adult ordinary readers are similar and fall off monotonically and symmetrically with eccentricity, hence conforming with the first Aubert—Foerster law (1857). However, the FRFs tested with symbols are narrower than those tested with letters of the same sizes and stroke widths, which is not in accordance with the first Aubert—Foerster law. In addition, the FRFs of symbols are different for each subject group. It is suggested that recognition in the peripheral field is not determined by visual acuity alone; rather, it is further confined or determined by the visual strategy employed to accomplish the task, and its associated distribution of lateral masking.
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Quick, Kristin M., Jessica L. Mischel, Patrick J. Loughlin, and Aaron P. Batista. "The critical stability task: quantifying sensory-motor control during ongoing movement in nonhuman primates." Journal of Neurophysiology 120, no. 5 (November 1, 2018): 2164–81. http://dx.doi.org/10.1152/jn.00300.2017.
Full textAbstract:
Everyday behaviors require that we interact with the environment, using sensory information in an ongoing manner to guide our actions. Yet, by design, many of the tasks used in primate neurophysiology laboratories can be performed with limited sensory guidance. As a consequence, our knowledge about the neural mechanisms of motor control is largely limited to the feedforward aspects of the motor command. To study the feedback aspects of volitional motor control, we adapted the critical stability task (CST) from the human performance literature (Jex H, McDonnell J, Phatak A. IEEE Trans Hum Factors Electron 7: 138–145, 1966). In the CST, our monkey subjects interact with an inherently unstable (i.e., divergent) virtual system and must generate sensory-guided actions to stabilize it about an equilibrium point. The difficulty of the CST is determined by a single parameter, which allows us to quantitatively establish the limits of performance in the task for different sensory feedback conditions. Two monkeys learned to perform the CST with visual or vibrotactile feedback. Performance was better under visual feedback, as expected, but both monkeys were able to utilize vibrotactile feedback alone to successfully perform the CST. We also observed changes in behavioral strategy as the task became more challenging. The CST will have value for basic science investigations of the neural basis of sensory-motor integration during ongoing actions, and it may also provide value for the design and testing of bidirectional brain computer interface systems. NEW & NOTEWORTHY Currently, most behavioral tasks used in motor neurophysiology studies require primates to make short-duration, stereotyped movements that do not necessitate sensory feedback. To improve our understanding of sensorimotor integration, and to engineer meaningful artificial sensory feedback systems for brain-computer interfaces, it is crucial to have a task that requires sensory feedback for good control. The critical stability task demands that sensory information be used to guide long-duration movements.
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Jozet-Alves, Christelle, Julien Modéran, and Ludovic Dickel. "Sex differences in spatial cognition in an invertebrate: the cuttlefish." Proceedings of the Royal Society B: Biological Sciences 275, no. 1646 (May 27, 2008): 2049–54. http://dx.doi.org/10.1098/rspb.2008.0501.
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Evidence of sex differences in spatial cognition have been reported in a wide range of vertebrate species. Several evolutionary hypotheses have been proposed to explain these differences. The one best supported is the range size hypothesis that links spatial ability to range size. Our study aimed to determine whether male cuttlefish ( Sepia officinalis ; cephalopod mollusc) range over a larger area than females and whether this difference is associated with a cognitive dimorphism in orientation abilities. First, we assessed the distance travelled by sexually immature and mature cuttlefish of both sexes when placed in an open field (test 1). Second, cuttlefish were trained to solve a spatial task in a T-maze, and the spatial strategy preferentially used (right/left turn or visual cues) was determined (test 2). Our results showed that sexually mature males travelled a longer distance in test 1, and were more likely to use visual cues to orient in test 2, compared with the other three groups. This paper demonstrates for the first time a cognitive dimorphism between sexes in an invertebrate. The data conform to the predictions of the range size hypothesis. Comparative studies with other invertebrate species might lead to a better understanding of the evolution of cognitive dimorphism.
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Kaptein, Ronald G., and Jan A. M. Van Gisbergen. "Canal and Otolith Contributions to Visual Orientation Constancy During Sinusoidal Roll Rotation." Journal of Neurophysiology 95, no. 3 (March 2006): 1936–48. http://dx.doi.org/10.1152/jn.00856.2005.
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Using vestibular sensors to maintain visual stability during changes in head tilt, crucial when panoramic cues are not available, presents a computational challenge. Reliance on the otoliths requires a neural strategy for resolving their tilt/translation ambiguity, such as canal–otolith interaction or frequency segregation. The canal signal is subject to bandwidth limitations. In this study, we assessed the relative contribution of canal and otolith signals and investigated how they might be processed and combined. The experimental approach was to explore conditions with and without otolith contributions in a frequency range with various degrees of canal activation. We tested the perceptual stability of visual line orientation in six human subjects during passive sinusoidal roll tilt in the dark at frequencies from 0.05 to 0.4 Hz (30° peak to peak). Because subjects were constantly monitoring spatial motion of a visual line in the frontal plane, the paradigm required moment-to-moment updating for ongoing ego motion. Their task was to judge the total spatial sway of the line when it rotated sinusoidally at various amplitudes. From the responses we determined how the line had to be rotated to be perceived as stable in space. Tests were taken both with (subject upright) and without (subject supine) gravity cues. Analysis of these data showed that the compensation for body rotation in the computation of line orientation in space, although always incomplete, depended on vestibular rotation frequency and on the availability of gravity cues. In the supine condition, the compensation for ego motion showed a steep increase with frequency, compatible with an integrated canal signal. The improvement of performance in the upright condition, afforded by graviceptive cues from the otoliths, showed low-pass characteristics. Simulations showed that a linear combination of an integrated canal signal and a gravity-based signal can account for these results.
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Donnet, Sophie, Ramon Bartolo, José Maria Fernandes, João Paulo Silva Cunha, Luis Prado, and Hugo Merchant. "Monkeys time their pauses of movement and not their movement-kinematics during a synchronization-continuation rhythmic task." Journal of Neurophysiology 111, no. 10 (May 15, 2014): 2138–49. http://dx.doi.org/10.1152/jn.00802.2013.
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A critical question in tapping behavior is to understand whether the temporal control is exerted on the duration and trajectory of the downward-upward hand movement or on the pause between hand movements. In the present study, we determined the duration of both the movement execution and pauses of monkeys performing a synchronization-continuation task (SCT), using the speed profile of their tapping behavior. We found a linear increase in the variance of pause-duration as a function of interval, while the variance of the motor implementation was relatively constant across intervals. In fact, 96% of the variability of the duration of a complete tapping cycle (pause + movement) was due to the variability of the pause duration. In addition, we performed a Bayesian model selection to determine the effect of interval duration (450–1,000 ms), serial-order (1–6 produced intervals), task phase (sensory cued or internally driven), and marker modality (auditory or visual) on the duration of the movement-pause and tapping movement. The results showed that the most important parameter used to successfully perform the SCT was the control of the pause duration. We also found that the kinematics of the tapping movements was concordant with a stereotyped ballistic control of the hand pressing the push-button. The present findings support the idea that monkeys used an explicit timing strategy to perform the SCT, where a dedicated timing mechanism controlled the duration of the pauses of movement, while also triggered the execution of fixed movements across each interval of the rhythmic sequence.
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Wilczyńska, Dominika, Marcin Dornowski, and Anna Zasadna. "PAIN MANAGEMENT AND OPTIMISM LEVELS AMONG OFFICE WORKERS WITH CERVICAL SPINE COMPLAINTS." Acta Neuropsychologica 16, no. 3 (September 10, 2018): 267–74. http://dx.doi.org/10.5604/01.3001.0012.5916.
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Coping with pain plays a very important role in human life and it may differ depending on the personality characteristics of patients such as their level of optimism. The aim of this study was therefore to determine whether the coping strategies for to cervical spine pain amongof office workers were determined by gender, the locus of pain control orand an optimistic attributional style. 30 office workers (Females = 15, Males = 15) took part in the experiment. The age of the participants was for females (M and for =43; SD=5.,9) and for males (M=44.,9; SD=4.,9. The subjects were asked to fill out 4 questionnaires: (CSQ), (BPCQ), (ASQ), a 10-grade visual analogue scale (VAS) and an original questionnaire. The study revealed that most of the office workers declare the ability to copeing with pain. Women were significantly more focused on emotions as a pain coping strategy than were the males participants. It was also shown that the internal locus of pain control significantly correlates with coping focused on problem solving. Participants characterized by anwith optimistic attributableional style used task oriented strategies more often than did the pessimists. There were no significant differences in the level of perceived pain between optimists and pessimists. It was foundind that there are statistically significant differences in coping with pain coping according to gender. Women were significantly more focused on emotions as a pain coping strategy than were the males participants. A high level of optimism may have a significant impact on the reduction of emotion - oriented strategies such as catastrophising by switching on more beneficial strategies to cope with pain by the individual. There are no significant differences in the level of perceived pain between pessimists and optimists.
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Sujan, Vivek Anand, Marco Antonio Meggiolaro, and Felipe Augusto Weilemann Belo. "A new technique in mobile robot simultaneous localization and mapping." Sba: Controle & Automação Sociedade Brasileira de Automatica 17, no. 2 (June 2006): 189–204. http://dx.doi.org/10.1590/s0103-17592006000200007.
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In field or indoor environments it is usually not possible to provide service robots with detailed a priori environment and task models. In such environments, robots will need to create a dimensionally accurate geometric model by moving around and scanning the surroundings with their sensors, while minimizing the complexity of the required sensing hardware. In this work, an iterative algorithm is proposed to plan the visual exploration strategy of service robots, enabling them to efficiently build a graph model of their environment without the need of costly sensors. In this algorithm, the information content present in sub-regions of a 2-D panoramic image of the environment is determined from the robot's current location using a single camera fixed on the mobile robot. Using a metric based on Shannon's information theory, the algorithm determines, from the 2-D image, potential locations of nodes from which to further image the environment. Using a feature tracking process, the algorithm helps navigate the robot to each new node, where the imaging process is repeated. A Mellin transform and tracking process is used to guide the robot back to a previous node. This imaging, evaluation, branching and retracing its steps continues until the robot has mapped the environment to a pre-specified level of detail. The effectiveness of this algorithm is verified experimentally through the exploration of an indoor environment by a single mobile robot agent using a limited sensor suite.
Dissertations / Theses on the topic "Task-determined visual strategy"
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Geiger, Gad, and Jerome Y. Lettvin. "A View on Dyslexia." 1997. http://hdl.handle.net/1721.1/7177.
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We describe here, briefly, a perceptual non-reading measure which reliably distinguishes between dyslexic persons and ordinary readers. More importantly, we describe a regimen of practice with which dyslexics learn a new perceptual strategy for reading. Two controlled experiment on dyslexics children demonstrate the regimen's efficiency.
Conference papers on the topic "Task-determined visual strategy"
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Shortridge, Woodbury, Thomas M. Gable, Brittany E. Noah, and Bruce N. Walker. "Auditory and Head-Up Displays for Eco-Driving Interfaces." In The 23rd International Conference on Auditory Display. Arlington, Virginia: The International Community for Auditory Display, 2017. http://dx.doi.org/10.21785/icad2017.028.
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Eco-driving describes a strategy for operating a vehicle in a fuel-efficient manner. Current research shows that visual eco-driving interfaces can reduce fuel consumption by shaping motorists’ driving behavior but may hinder safe driving performance. The present study aimed to generate insights and direction for design iterations of auditory eco-driving displays and a potential matching head-up visual display to minimize the negative effects of using purely visual head-down eco-driving displays. Experiment 1 used a sound card-sorting task to establish mapping, scaling, and polarity of acoustic parameters for auditory eco-driving interfaces. Surveys following each sorting task determined preferences for the auditory display types. Experiment 2 was a sorting task to investigate design parameters of visual icons that are to be paired with these auditory displays. Surveys following each task revealed preferences for the displays. The results facilitated the design of intuitive interface prototypes for an auditory and matching head-up eco-driving display that can be compared to each other.