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Dissertations / Theses on the topic 'Local Field Potential (LFP)'

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Published: 4 June 2021

Last updated: 6 September 2023

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1

Seiscio, Andrew R. "The Role of GABAergic Transmission in Mediation of Striatal Local Field Potentials (LFPs)." Digital Archive @ GSU, 2008. http://digitalarchive.gsu.edu/psych_theses/63.

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In the present study, electrophysiological and behavioral effects of compromised Gama-Aminobutyric Acid (GABAergic) transmission were investigated in adult Rhesus macaque monkeys (N=2). GABAergic transmission was perturbed in the putamen by administration of a GABAa receptor antagonist, gabazine (10 and 500 μM), via a microdialysis-local field potential (MD-LFP) probe. Resultant changes in striatal local field potentials (LFPs) were measured as an assay of synchrony. Gabazine perfusion evoked discrete large amplitude spikes in LFPs in all subjects, and the frequency and shape of indi

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Ocazionez, Sergio Andr?s Conde. "The influence of visual inter-hemispheric connections on spiking, assembly and LFP activities, and their phase relationship during figure-ground stimulation." Universidade Federal do Rio Grande do Norte, 2014. http://repositorio.ufrn.br:8080/jspui/handle/123456789/17032.

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Made available in DSpace on 2014-12-17T15:29:22Z (GMT). No. of bitstreams: 1 SergioACO_TESE.pdf: 4589227 bytes, checksum: 062baf399b5377e444d02b747586f12b (MD5) Previous issue date: 2014-03-31<br>Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior<br>Desde os descobrimentos pioneiros de Hubel e Wiesel acumulou-se uma vasta literatura descrevendo as respostas neuronais do c?rtex visual prim?rio (V1) a diferentes est?mulos visuais. Estes est?mulos consistem principalmente em barras em movimento, pontos ou grades, que s?o ?teis para explorar as respostas dentro do campo receptivo cl?ssi

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3

Gomes, Jean-Marie. "Etude expérimentale et théorique de la genèse des potentiels de champs locaux par les neurones corticaux." Thesis, Paris 6, 2015. http://www.theses.fr/2015PA066409/document.

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Les potentiels de champs locaux (LFP) sont des événements de fréquence inférieure à 200-500 Hz, résultant de l'activité cérébrale. Leur signification et les mécanismes contribuant à leur formation sont encore très débattus. Ainsi, l'existence et l'importance d'un filtrage des courants ioniques par le tissu cérébral est controversée. Certains auteurs concluent que le milieu est résistif, alors que d'autres suggèrent que le tissu cérébral pourrait exercer un filtrage passe-bas significatif sur les courants électriques. Une méthode de mesure nouvelle est présentée ici, s'appuyant sur le concept d

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TANTILLO, Elena. "Bidirectional Neuron-glioma interactions: effects of Glioma Cells on Synaptic activity and its impact on tumor growth." Doctoral thesis, Scuola Normale Superiore, 2020. http://hdl.handle.net/11384/94546.

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Gliomas grow in a neuronal environment, but the interactions between glioma cells and peritumoral neurons remain poorly understood. Understanding this complex relationship could add useful information to develop more effective therapeutic approaches for the treatment of this deadly disease. In recent years, the interaction between cancer cells and tumor microenvironment has emerged as one important regulator of tumor progression. Thus, my thesis aimed to investigate the crosstalk between neural peritumoral tissue and glioma cells; in particular, I assessed i) functional impairments of peritumo

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5

Ortiz, Cantin. "Study of neural correlates of attention in mice with spectro-spatio-temporal approaches." Thesis, KTH, Skolan för datavetenskap och kommunikation (CSC), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-220948.

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While signatures of attention can be observed in widespread areas within and outside of cortex, the control of attention is thought to be regulated by higher cognitive brain areas, such as the prefrontal cortex. In their recent study on mice Kim et al. could show that successful allocation of attention is characterized by increased spiking of a specific type of inhibitory interneurons, the parvalbumin neurons, and higher oscillatory activity in the gamma band in the local prefrontal network. It was recently demonstrated that encoding of working memory in prefrontal areas is linked to bursts of

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6

Bridle, Ismail Hamzaan. "Non-polynomial scalar field potentials in the local potential approximation." Thesis, University of Southampton, 2017. https://eprints.soton.ac.uk/410270/.

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We present the renormalisation group analysis of O(N) invariant scalar field theory in the local potential approximation. Linearising around the Gaussian fixed point, we find the same eigenoperators solutions exist for both the Wilsonian and the Legendre effective actions, given by solutions to Kummer’s equations. We find the usual polynomial eigenoperators and the Hilbert space they define are a natural subset of these solutions given by a specific set of quantised eigenvalues. Allowing for continuous eigenvalues, we find non-polynomial eigenoperator solutions, the so called Halpern-Huang dir

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7

Statheros, Thomas. "Investigation of local minima in autonomous potential field agents/vehicles in pure dynamic environment." Thesis, University of Kent, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.652027.

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Autonomous vehicle navigation can be divided into two major areas of research: Collision avoidance and Track-Keeping. This study focuses on Collision avoidance which is one of the major issues that unmanned autonomous vehicles have to face. Collision avoidance may be further grouped into classical and soft computing based categories. Classical techniques are based on mathematical models and algorithms, while soft-computing techniques are based on Artificial Intelligence. In this study, we focus on the Classical techniques and more specifically in the Potential Field Methods. The potential fiel

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8

Williams, David. "The functional significance of oscillatory local field potential activity in the Parkinsonian subthalamic nucleus." Thesis, University College London (University of London), 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.419980.

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9

Denker, Michael [Verfasser]. "Interpreting the local field potential as a reflection of cooperative neuronal spiking dynamics / Michael Denker." Berlin : Freie Universität Berlin, 2009. http://d-nb.info/1023816490/34.

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10

Robertazzi, Federica. "Real-time rejection of movement-related artifacts in subthalamic nucleus local field potential recordings during adaptive Deep Brain Stimulation." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019.

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La stimolazione cerebrale profonda (DBS) è una tecnica utilizzata in clinica per trattare alcune patologie come la malattia di Parkinson (PD) tramite un rilascio locale di corrente alternata ad alta frequenza (> 100 Hz), grazie all’utilizzo di elettrodi impiantati nei gangli della base durante una procedura di chirurgia stereotassica. Negli ultimi anni indagini neurofisiologiche svolte con la DBS hanno inoltre consentito la scoperta di potenziali marcatori neurali caratteristici del PD e il loro utilizzo per una stimolazione definita adattativa (aDBS) in cui l’ampiezza dello stimolo in tension

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11

Siadatnejad, Sohail. "Quantifying sensory information in continuous brain signals." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/quantifying-sensory-information-in-continuous-brain-signals(593a80a8-abba-48d2-87d1-c50c95b14455).html.

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How is information processed in the brain? This is one of the main and most challenging questions in Neuroscience. The established hypothesis is that information is encoded in the temporal dynamics of spikes. However, there is growing evidence that continuous signals such as Local Field Potentials (LFP) can play an important role in coding neural information. Recently, Montemurro et al. [2008] reported that the phase-of-firing code, a mechanism previously observed in the hippocampus, is used in the sensory cortices for information encoding. In the phase-of-firing code, the neurons communicate

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12

Thompson, Garth John. "Neural basis and behavioral effects of dynamic resting state functional magnetic resonance imaging as defined by sliding window correlation and quasi-periodic patterns." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/49083.

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While task-based functional magnetic resonance imaging (fMRI) has helped us understand the functional role of many regions in the human brain, many diseases and complex behaviors defy explanation. Alternatively, if no task is performed, the fMRI signal between distant, anatomically connected, brain regions is similar over time. These correlations in “resting state” fMRI have been strongly linked to behavior and disease. Previous work primarily calculated correlation in entire fMRI runs of six minutes or more, making understanding the neural underpinnings of these fluctuations difficult. Recent

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Shimotake, Akihiro. "Direct Exploration of the Role of the Ventral Anterior Temporal Lobe in Semantic Memory: Cortical Stimulation and Local Field Potential Evidence From Subdural Grid Electrodes." Kyoto University, 2015. http://hdl.handle.net/2433/202675.

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14

Cecchetto, Claudia. "Neuronal Population Encoding of Sensory Information in the Rat Barrel Cortex: Local Field Potential Recording and Characterization by an Innovative High-Resolution Brain-Chip Interface." Doctoral thesis, Università degli studi di Padova, 2016. http://hdl.handle.net/11577/3424482.

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Neuronal networks are at the base of information processing in the brain. They are series of interconnected neurons whose activation defines a recognizable linear pathway. The main goal of studying neural ensembles is to characterize the relationship between the stimulus and the individual or general neuronal responses and the relation amongst the electrical activities of neurons within the network, also understanding how topology and connectivity relates to their function. Many techniques have been developed to study these complex systems: single-cell approaches aim to investigate single neur

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Tran, Harry. "Signatures extracellulaires des potentiels d'action neuronaux : modélisation et analyse." Thesis, Université de Lorraine, 2019. http://www.theses.fr/2019LORR0125.

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Cette thèse a pour objectif de contribuer à la modélisation, à la simulation et à l’analyse des signaux contenant des potentiels d’action extracellulaires (EAPs), tels que mesurés in-vivo par des microélectrodes implantées dans le cerveau. Les modèles actuels pour la simulation des EAPs consistent soit en des modèles compartimentaux très détaillés et lourds en calcul, soit en des modèles dipolaires jugés trop simplistes. Dans un premier temps, une approche de simulation des EAPs se situant entre ces deux extrêmes est proposée, où la somme des contributions des compartiments du neurone est trai

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16

Krüger, Hartmut. "Lokale Feldpotentiale im Elektrokortikogramm und Elektroenzehpalogramm des Menschen: Nachweis, Beschreibungskriterien,Anwendung." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät II, 1998. http://dx.doi.org/10.18452/14406.

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Durch Kreuzkorrelation von ECoG- und EEG-Signalen hoher Bandbreite (10 - 400 Hz) mit dem Muster eines Amplituden - Zeit - Templates von 10 ms Dauer können Subpotentiale (SP) selektiert werden, die dem sogenannten ?local field potential? ähnlich sind.Diese Ähnlichkeit ergibt sich i. durch den Vergleich mit dem ermittelten Amplituden - Zeit - Template des SP. ii. durch den Vergleich mit der Lage der Quellstrukturen zur ableitenden Elektrode. Die SP - Modulanalyse liefert Potentialverteilung für jede untersuchte Elektrode. Diese ist stets in ein Nahfeld und Fernfelder organisiert, wobei die P

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Courtiol, Emmanuelle. "L’inextricable relation olfaction-respiration chez le rat : études de l’impact des variations de flairages sur l’activité du bulbe olfactif et sur la discrimination des odeurs." Thesis, Lyon 1, 2012. http://www.theses.fr/2012LYO10309/document.

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Chez les mamifères terrestres, l’échantillonnage des odeurs (flairage) est inextricablement lié à la respiration. Le flairage contraint à la fois le décours temporel et l’intensité de l’input olfactif. Or le flaireage est un acte dynamique, il peut varier aussi bien en fréquence qu’en débit. Dans une 1ère partie de mon travail de thèse, nous avoins souhaité caractériser l’impact des variations de fréquence et de débit respiratiore sur l’activité du bulbe olfactif. Pour cela, nous avons mis au point une méthode de double trachéotomie chez le rat anesthésié nous permettant de contrôler préciséme

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Constantinou, Maria. "Cracking the brain's code : how do brain rhythms support information processing?" Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/cracking-the-brains-code-how-do-brain-rhythms-support-information-processing(b1eb1d9b-8a3c-4430-b6e9-51fcddd50098).html.

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The brain processes information sensed from the environment and guides behaviour. A fundamental component in this process is the storage and retrieval of past experiences as memories, which relies on the hippocampal formation. Although there has been a great progress in understanding the underlying neural code by which neurons communicate information, there are still open questions. Neural activity can be measured extracellularly as either spikes or field potentials. Isolated spikes and bursts of high-frequency spikes followed by silent periods can transmit messages to distant networks. The lo

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Tukker, Jan Johan. "Determinants of neuronal firing patterns in the hippocampus." Thesis, University of Oxford, 2009. http://ora.ox.ac.uk/objects/uuid:0c0c8f92-e146-4e2a-b7f3-6d27a9b12387.

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The activity of networks subserving memory and learning in the hippocampus is under the control of GABAergic interneurons. In order to test the contribution of distinct cell types, I have recorded extracellularly, labelled, and identified different types of interneuron in area CA3 of the hippocampus, a region implicated in the generation of gamma and theta oscillations, and the initiation of sharp-waves. I present here a detailed analysis of the spike timing of parvalbumin-positive (PV) basket and physiologically identified pyramidal cells in area CA3, relative to various network states record

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Young, Katherine S. "Adults' responses to infant vocalisations : a neurobehavioural investigation." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:6f91f1ae-0948-4b34-b45f-ee65ae421934.

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Infant vocalisations are uniquely salient sounds in the environment. They universally attract attention and compel the listener to respond with speed and care. They provide a wealth of information to parents about their infant’s needs and affective state. There is a scientific consensus that early parenting has a profound impact on child development. In particular, the sensitivity with which parents respond to their infant’s communicative cues has been shown to affect cognitive and socio-emotional outcomes. The mechanisms underlying such sensitivity are not well understood. In this thesis, adu

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Adam, Tugdual. "Investigation of the effects of Cannabidiol on sleep-like states and memory-associated brain events." Thesis, KTH, Skolan för kemi, bioteknologi och hälsa (CBH), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-282427.

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A growing interest for Cannabidiol (CBD), a component of Cannabis Sativa, has occurred over the past years. The medical potential of the component is yet to be better characterized, as its effects on sleep, and in particular memory, are to date not well understood or consistently characterized. This master thesis project focuses on analysing the effect of CBD on an anaesthesia-induced sleep-like state in rats, and its effects on the hippocampal sharp-wave-ripples, which have been shown to be associated with memory replay during sleep, and hence system consolidation. The hippocampus and prefron

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Ferro, Demetrio. "Effects of attention on visual processing between cortical layers and cortical areas V1 and V4." Doctoral thesis, Università degli studi di Trento, 2019. http://hdl.handle.net/11572/246290.

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Visual attention improves sensory processing, as well as perceptual readout and behavior. Over the last decades, many proposals have been put forth to explain how attention affects visual neural processing. These include the modulation of neural firing rates and synchrony, neural tuning properties, and rhythmic, subthreshold activity. Despite the wealth of knowledge provided by previous studies, the way attention shapes interactions between cortical layers within and between visual sensory areas is only just emerging. To investigate this, we studied neural signals from macaque V1 and V4 visual

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Elijah, Daniel. "Neural encoding by bursts of spikes." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/neural-encoding-by-bursts-of-spikes(56f4cf97-3887-4e89-bc0d-8db183ce9ce1).html.

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Neurons can respond to input by firing isolated action potentials or spikes. Sequences of spikes have been linked to the encoding of neuron input. However, many neurons also fire bursts; mechanistically distinct responses consisting of brief high-frequency spike firing. Bursts form separate response symbols but historically have not been thought to encode input. However, recent experimental evidence suggests that bursts can encode input in parallel with tonic spikes. The recognition of bursts as distinct encoding symbols raises important questions; these form the basic aims of this thesis: (1)

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Szymanski, Francois-Daniel. "Functional laminar architecture of the rat primary auditory cortex." Thesis, University of Oxford, 2010. http://ora.ox.ac.uk/objects/uuid:534611d7-d975-4b0f-91ed-5f81a7f1fb8c.

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The goal of this thesis is to investigate the functional role of the cortical column architecture within some of the existing brain coding theories. Here I focus on the hierarchical models of predictive coding and the 'phase of firing' coding hypothesis. Using an oddball paradigm consisting of a sequence of identical sounds interspersed with rare, unexpected sounds, one can observe a difference between the scalp potentials evoked by oddball and common sounds. This difference has been linked to predictive coding and novelty detection, and Stimulus Specific Adaptation (SSA) has been suggested as

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Teixeira, Robson Scheffer. "Caracteriza??o dos acoplamentos fase-amplitude na regi?o CA1 do hopocampo." Universidade Federal do Rio Grande do Norte, 2011. http://repositorio.ufrn.br:8080/jspui/handle/123456789/17019.

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Made available in DSpace on 2014-12-17T15:28:49Z (GMT). No. of bitstreams: 1 RobsonST_DISSERT.pdf: 350196 bytes, checksum: eaf6055553dc1f6cec39e0f754c20635 (MD5) Previous issue date: 2011-12-02<br>Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior<br>Brain oscillation are not completely independent, but able to interact with each other through cross-frequency coupling (CFC) in at least four different ways: power-to-power, phase-to-phase, phase-to-frequency and phase-to-power. Recent evidence suggests that not only the rhythms per se, but also their interactions are involved in the e

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Benis, Damien. "Rôle du noyau subthalamique dans les fonctions exécutives chez le patient Parkinsonien." Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENS016/document.

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Par sa connectivité directe avec le cortex, le noyau subthalamique (NST) représente une des structures d'entrée du système des ganglions de la base, et se trouve impliqué dans différents aspects du comportement (contrôle moteur, cognitif et limbique). Néanmoins, les corrélats électrophysiologiques de ces processus restent débattus. Les études effectuées dans le cadre de cette thèse visent à éclaircir le rôle possible du NST dans trois fonctions exécutives, à savoir l'inhibition réactive (suppression d'un mouvement programmé), l'inhibition proactive (préparation à inhiber son mouvement) et l'at

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Ferro, Demetrio. "Effects of attention on visual processing between cortical layers and cortical areas V1 and V4." Doctoral thesis, Università degli studi di Trento, 2019. http://hdl.handle.net/11572/246290.

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Visual attention improves sensory processing, as well as perceptual readout and behavior. Over the last decades, many proposals have been put forth to explain how attention affects visual neural processing. These include the modulation of neural firing rates and synchrony, neural tuning properties, and rhythmic, subthreshold activity. Despite the wealth of knowledge provided by previous studies, the way attention shapes interactions between cortical layers within and between visual sensory areas is only just emerging. To investigate this, we studied neural signals from macaque V1 and V4 visual

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Briffaud, Virginie. "Rythme lent du bulbe olfactif : étude des oscillations du potentiel de membrane des cellules mitrales/à panache et de leurs relations avec l'activité de décharge et l'activité du réseau." Phd thesis, Université Claude Bernard - Lyon I, 2011. http://tel.archives-ouvertes.fr/tel-00820089.

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Le rythme lent lié à la respiration est une caractéristique proéminente de l'activité du bulbe olfactif de rat. Il se définit par des oscillations de grande amplitude du potentiel de champ local, une activité de décharge des cellules mitrales/ à panache (M/P) synchronisée à la respiration et des oscillations lentes de leur potentiel de membrane (OPLM). Des relations spécifiques entre ces activités détermineraient la participation d'une cellule M/P au traitement de l'information olfactive. Jusqu'à présent, il n'existait que très peu de données sur ces relations. L'objectif de cette thèse a été

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Lambrecq, Virginie. "Corrélats neuronaux de l’incertitude. Aspects psychophysiologiques et physiopathologiques." Thesis, Bordeaux, 2014. http://www.theses.fr/2014BORD0344/document.

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L’incertitude est un processus cognitif communément expérimenté lors d’une prise de décision. Dansle trouble obsessionnel-compulsif (TOC), il est excessif et compromet les capacités décisionnelles del'individu.Ce travail avait comme objectif une meilleure compréhension des aspects physiologiques etphysiopathologiques de l’incertitude, au travers d'une double approche, comportementale etélectrophysiologique. Dans un premier temps, nous avons construit une tâche originale qui permetd'exprimer son incertitude au cours d'une prise de décision. Avec cette "tâche d’incertitude", nousavons exploré le

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Aravamuthan, Bhooma Rajagopalan. "Comparing the radiological anatomy, electrophysiology, and behavioral roles of the pedunculopontine and subthalamic nuclei in the normal and parkinsonian brain." Thesis, University of Oxford, 2008. http://ora.ox.ac.uk/objects/uuid:9a735b39-c1fe-4d5f-b05f-3385f27e6e58.

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Deep brain stimulation (DBS) of the subthalamic nucleus (STN) and DBS of the pedunculopontine nucleus (PPN) have been shown to be effective surgical therapies for Parkinson’s disease (PD). To better understand the PPN and STN as DBS targets for PD, this research compares the anatomy, electrophysiology, and motor control roles of these nuclei. PPN and STN connections were examined in vivo in human subjects and in the non-human primate using probabilistic diffusion tractography. Both the PPN and STN were connected with each other and with the motor cortex (M1) and basal ganglia. After studying t

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Le, Merre Pierre. "Dynamique corticale et intégration sensorielle chez la souris éveillée : impact du contexte comportemental." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSE1335.

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La perception menant à une prise de décision implique de multiples aires corticales. Il a été proposé que l'information sensorielle se propage des aires sensorielles primaires, codant principalement la nature du stimulus, aux aires de haut-niveau - plus frontales - codant d'avantage la valence du stimulus ou la décision. Pour mieux comprendre l'intégration corticale des signaux sensoriels, nous avons enregistré les réponses sensorielles évoquées (RSE) simultanément dans différentes aires corticales, tandis que des souris apprenaient une tâche de détection sensorielle. Chez les souris ayant app

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Bock, Antje [Verfasser], Tilmann [Akademischer Betreuer] Sander-Thömmes, Klaus [Akademischer Betreuer] Obermayer, and Hermann [Akademischer Betreuer] Hinrichs. "Removal of the cardiac cycle artefact and subsequent coupling analysis between cortex and basal ganglia : simultaneous magnetoencephalographic and intracranial local field potential recordings in patients with movement disorders undergoing deep brain stimulation / Antje Bock. Gutachter: Klaus Obermayer ; Hermann Hinrichs ; Tilmann Sander-Thömmes. Betreuer: Tilmann Sander-Thömmes." Berlin : Technische Universität Berlin, 2014. http://d-nb.info/1065665741/34.

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Darling, Ryan Daniel. "Single Cell Analysis of Hippocampal Neural Ensembles during Theta-Triggered Eyeblink Classical Conditioning in the Rabbit." Miami University / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=miami1225460517.

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Paula, Netto Tibério de. "Correções de origem quântica para a ação do vácuo e suas aplicações." Universidade Federal de Juiz de Fora (UFJF), 2017. https://repositorio.ufjf.br/jspui/handle/ufjf/6787.

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Jacob, Pierre-Yves. "Rôle du cortex entorhinal médian dans le traitement des informations spatiales : études comportementales et électrophysiologiques." Thesis, Aix-Marseille, 2014. http://www.theses.fr/2014AIXM4702/document.

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Le travail de recherche réalisé au cours de cette thèse s'intéresse à la nature des représentations spatiales formées par le cortex entorhinal médian (CEM). Tout d'abord, nous montrons que le CEM code spécifiquement une information de distance, l'une des composantes nécessaires pour que l'animal puisse réaliser un type de navigation reposant sur les informations idiothétiques, appelé intégration des trajets. Puis, nous observons que le système vestibulaire, une source importante d'informations idiothétiques, influence l'activité thêta du CEM et permet la modulation de ce rythm

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Muralidharan, Prasanna. "Hand-Movement Prediction Using LFP Data." Thesis, 2010. https://etd.iisc.ac.in/handle/2005/1342.

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The last decade has seen a surge in the development of Brain-Machine Interfaces (BMI) as assistive neural devices for paralysis patients. Current BMI research typically involves a subject performing movements by controlling a robotic prosthesis. The neural signal that we consider for analysis is the Local Field Potential (LFP). The LFP is a low frequency neural signal recorded from intra-cortical electrodes, and has been recognized as one containing movement information. This thesis investigates hand-movement prediction using LFP data as input. In Chapter 1, we give an overview of Brain Machin

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Muralidharan, Prasanna. "Hand-Movement Prediction Using LFP Data." Thesis, 2010. http://etd.iisc.ernet.in/handle/2005/1342.

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Abstract:

The last decade has seen a surge in the development of Brain-Machine Interfaces (BMI) as assistive neural devices for paralysis patients. Current BMI research typically involves a subject performing movements by controlling a robotic prosthesis. The neural signal that we consider for analysis is the Local Field Potential (LFP). The LFP is a low frequency neural signal recorded from intra-cortical electrodes, and has been recognized as one containing movement information. This thesis investigates hand-movement prediction using LFP data as input. In Chapter 1, we give an overview of Brain Machin

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Chandran, Subash K. S. "Analysis of Local Field Potential and Gamma Rhythm Using Matching Pursuit Algorithm." Thesis, 2016. http://etd.iisc.ac.in/handle/2005/2771.

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Signals recorded from the brain often show rhythmic patterns at different frequencies, which are tightly coupled to the external stimuli as well as the internal state of the subject. These signals also have transient structures related to spiking or sudden onset of a stimulus, which have a duration not exceeding tens of milliseconds. Further, brain signals are highly non-stationary because both behavioral state and external stimuli can change over a short time scale. It is therefore essential to study brain signals using techniques that can represent both rhythmic and transient components of

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Chandran, Subash K. S. "Analysis of Local Field Potential and Gamma Rhythm Using Matching Pursuit Algorithm." Thesis, 2016. http://etd.iisc.ernet.in/handle/2005/2771.

Full text

Abstract:

Signals recorded from the brain often show rhythmic patterns at different frequencies, which are tightly coupled to the external stimuli as well as the internal state of the subject. These signals also have transient structures related to spiking or sudden onset of a stimulus, which have a duration not exceeding tens of milliseconds. Further, brain signals are highly non-stationary because both behavioral state and external stimuli can change over a short time scale. It is therefore essential to study brain signals using techniques that can represent both rhythmic and transient components of

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Sinha, Manisha. "Subthreshold Conductances Regulate Theta-Frequency Local Field Potentials and Spike Phase." Thesis, 2016. http://etd.iisc.ac.in/handle/2005/3151.

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Local field potentials (LFPs), extracellular potentials that reflect localized electrical activity, have long been used as a window to understand the behavioural dependence and mechanistic aspects of brain physiology. A principal premise that has driven the interpretation of LFPs is that they largely reflect the synaptic drive that impinges on neurons located in the vicinity of the recording microelectrode. An implicit, yet critical, assumption that led to the emergence of this premise is that dendrites, the structures onto which most synaptic inputs project, are purely passive compartments. H

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Sinha, Manisha. "Subthreshold Conductances Regulate Theta-Frequency Local Field Potentials and Spike Phase." Thesis, 2016. http://hdl.handle.net/2005/3151.

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Local field potentials (LFPs), extracellular potentials that reflect localized electrical activity, have long been used as a window to understand the behavioural dependence and mechanistic aspects of brain physiology. A principal premise that has driven the interpretation of LFPs is that they largely reflect the synaptic drive that impinges on neurons located in the vicinity of the recording microelectrode. An implicit, yet critical, assumption that led to the emergence of this premise is that dendrites, the structures onto which most synaptic inputs project, are purely passive compartments. H

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Das, Aritra. "Effect of Stimulus Normalization and Visual Attention at multiple scales of Neural Integration." Thesis, 2022. https://etd.iisc.ac.in/handle/2005/5986.

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The effect of visual attention on neural signals has been extensively studied using various techniques such as macaque neurophysiology and human electro/magneto encephalogram (EEG/MEG). Depending on the technique, different neural measures are typically used for studying attention. For example, in neurophysiology experiments involving macaques, many studies have focused on the modulation in spiking activity or the change in oscillatory power at different frequency bands such as alpha (8-12 Hz) or gamma (30-80 Hz) with attention, or the change in the relationship of spikes with these oscillatio

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"Neural Mechanisms of Sensory Integration: Frequency Domain Analysis of Spike and Field Potential Activity During Arm Position Maintenance with and Without Visual Feedback." Doctoral diss., 2017. http://hdl.handle.net/2286/R.I.46363.

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abstract: Understanding where our bodies are in space is imperative for motor control, particularly for actions such as goal-directed reaching. Multisensory integration is crucial for reducing uncertainty in arm position estimates. This dissertation examines time and frequency-domain correlates of visual-proprioceptive integration during an arm-position maintenance task. Neural recordings were obtained from two different cortical areas as non-human primates performed a center-out reaching task in a virtual reality environment. Following a reach, animals maintained the end-point position of

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Liu, Ta-Wei, and 劉達偉. "Synchronization Study of Regional Local Field Potential in Rat after Dopamine Receptor Stimulation." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/43705396281058367763.

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碩士<br>國立交通大學<br>電控工程研究所<br>99<br>Neural oscillation represent the neural activity in nervous system, by recording neural oscillation connectivity and interactions within brain networks could be investigated in an effective measure. A wealth of research have suggested that electrophysiological signals in brain networks would interact with each other, and synchronization between distinct areas has been implied the mechanism for brain interaction. With disease influence or external stimulation, the neural oscillation induce linear and non-linear interaction. However, the neural oscillation intera

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Zuccheroso, Ettore. "Mapping of local field potential oscillations in the rat cerebellar cortex granule cell layer." Thesis, 2008. http://spectrum.library.concordia.ca/976059/1/MR45359.pdf.

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Local field potential (LFP) oscillations in the granule cell layer of the cerebellar cortex could be a signal representing an organizing influence on its networks. However, little is known about the relative location of these LFP oscillations across the cerebellar cortex topography. LFPs and unit activity were recorded in the cerebellar cortex of 4 immobile adult male rats. Three to eight multiple moveable microelectrodes were simultaneously implanted at three targets (positions) perpendicular to the transverse plane. Recordings were made at regular 0.25 to 0.5 mm intervals, or upon a change i

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Jiang, Cheng-Ting, and 蔣承廷. "Low-noise and low-power Analog Front End of Local Field Potential Acquisition for Parkinson's disease treatment." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/uec44f.

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碩士<br>國立交通大學<br>電機工程學系<br>106<br>Parkinson patients, receiving L-DOPA drug treatment, can really get the symptoms improved; however, after several years of treatment, most of them will face a "switch phenomenon" with poor efficacy. At this point, the "Deep Brain Stimulation (DBS)", which has undergone surgery, has become another treatment option. The subject of this paper is to propose a fully differential preamplifier circuit for the Parkinson's disease treatment system (deep brain stimulation) to amplify the local field potential signal and filter out the components of the non-Parkinson's di

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Sundaram, Arun N. E. "Saccade Related Gamma Potentials Recorded in Human Subthalamic Nucleus, Globus Pallidus Interna and Ventrointermediate Nucleus of the Thalamus." Thesis, 2012. http://hdl.handle.net/1807/33702.

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Gamma oscillations of local field potentials (LFP) in the basal ganglia and thalamus had not been studied during saccades. Eleven patients were studied during deep brain stimulation (DBS); 6 were in the subthalamic nucleus (STN); 3 in the globus pallidus interna (GPi); and 2 in the thalamic ventralis intermedius nucleus (Vim). Patients performed horizontal saccades to visual targets while LFPs from DBS electrodes, scalp electroencephalogram (EEG), and electrooculogram (EOG) were recorded. Wavelet spectrograms were generated and saccade onset and event-related gamma synchronizations (ERS) we

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