Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 42 for “"Field potentials"”.
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High frequency field potentials of the cerebellar cortex
… motor function. The origin and function of the field potential oscillations in the cerebellum, especially in the high frequencies, have not been explored sufficiently. The primary objective of this study was to investigate the spatio-temporal characteristics of high frequency field potentials …
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Investigation of Spatio-Spectral Dynamics of Local Field Potentials in Parkinson’s Disease
… technical difficulties. On the other hand, local field potentials (LFPs), owing to their oscillatory and robust nature, can overcome these technical issues. In this regard, we recorded LFPs from multitrack microelectrodes and macroelectrode in PD patients who underwent DBS surgery. We demonstrated …
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Surface recordings of evoked field potentials from the cerebellum with a flexmea microelectrode array
… This disynaptic input produces a multicomponent field potential composed of the P1, N 1, N2, N3, N4, and P3 waves. The climbing fiber input forms a monosynaptic input to the Purkinje cells and thus creates a much simpler field potential. The mossy and climbing fiber field potentials were recorded …
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Time-varying phase relationship between spiking neuronal responses and local field potentials in olfactory processing in manduca sexta
… coincidence of their spiking relative to local field potential (LFP) oscillation phase. Using the sphinx moth, Manduca sexta, as a model system, we tested the predictions of the TOM with regard to the trial-to-trial consistency of odor driven oscillations, the phase-locking of action potentials …
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Adaptive Detection of Beta Bursts of Local Field Potentials Recorded from Subthalamic Nucleus in Patients with Parkinson’s Disease
… to increase within the following years. Local field potentials (LFPs) recorded from deep brain stimulation (DBS) leads placed into the motor territory of the subthalamic nucleus (STN) can be used to investigate the mechanism of PD and allows for further development of new therapeutic …
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Simultaneous Behavior Onset Detection and Task Classification for Patients with Parkinson Disease Using Subthalamic Nucleus Local Field Potentials
… The detection is based on recorded Local Field Potentials (LFP) of the Subthalamic nucleus (STN), captured through Deep Brain Stimulation (DBS) process.</p> <p>One main part of this work is dedicated to the research of various properties and features of the STN LFP signals of several …
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Συναπτική δράση παραγώγων νευροδιαβιβαστών και αντιεπιληπτικών φαρμάκων στον εγκέφαλο φυσιολογικών και επιληπτικών πειραματοζώων
… method (1) and in vitro recordings of field potentials from the pyramidal cells of hippocampal area CA₁ (2). Postsynaptic excitability as expressed by the PS/fEPSP input-output curves was found increased in tg/tg mice as compared to controls. Quantitative differences in the degree of …
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Large-scale neural recordings and biophysical models for inferring network mechanisms of ketamine anesthesia
… support unconsciousness. First, I analyze local field potentials and single unit activity from ketamine anesthesia in non-human primates to show that the neocortex under ketamine is hyperactive based on all common measures of neural activity. Furthermore, I demonstrate that spiking UP-states that …
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Exploring the Role of PANNEXIN1A in an Acute Experimental Model of Parkinson's Disease
… pathways, and reduced ATP production. Local field potentials recorded from three regions of the ascending visual pathway showed complex changes in the beta- and gamma-band power and in the coherence between these regions. MPTP treatment produced significantly impaired movements which were …
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Two-Dimensional Electrode Array Studies of Propagating Epileptiform Neural Activity in the Rat Hippocampal Slice
… observe signals and to preserve viability. The field potentials recorded are spatially unique and provide a two-dimensional description of the underlying population activity in the various pyramidal cell strata and subpopulations. The application of current source density analysis to the …
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Design of High-Resolution SAR ADC for Detection of Sub-Cortical Neuron Action Potentials for BMI Applications
… of resolving both fast, low-amplitude action potentials (APs) and slow, higher-amplitude local field potentials (LFPs) under stringent power and area constraints. This thesis presents the design and simulation of a high-resolution, low-power successive approximation register (SAR) …
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Dynamics of dopamine signaling and network activity in the striatum during learning and motivated pursuit of goals
… training dependent dynamics in striatum local field potentials and coordinated neural firing that may differentially support both network rigidity and flexibility during pursuit of goals. Electrochemical measurements of real-time dopamine signaling during maze running revealed prolonged …
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Septotemporal Variation in Theta Rhythm Dynamics: Effects of Speed and Habituation
<p>Theta (6-12 Hz) field potentials and the synchronization (coherence) of these potentials present neural network indices of hippocampal physiology. Theta signals within the hippocampal formation may reflect alterations in sensorimotor integration, the flow of sensory input and/or distinct …
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Understanding Autonomic Control via Human Deep Brain Stimulation
… as measurement of electrical activity (local field potentials (LFPs)) to assess whether a nucleus is integral to a specific change in autonomic output. The sum of my work outlined in this thesis demonstrates that common DBS targets such as subthalamic nucleus (STN) and pedunculopontine nucleus …
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Potential fields from cardiac strands of cylindrical geometry
… classical forward and inverse volume conductor field problems associated with the isolated active cardiac strand. The Purkinje fiber and the atrial trabeculum are chosen as specific examples of cardiac tissue that may be well modeled by cylindrical geometry. The electrical behavior of these …
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An ultra-low-power neural recording amplifier and its use in adaptively-biased multi-amplifier arrays
… for recording either neural spikes or local field potentials (LFP). When configured for recording neural spikes, the amplifier yielded a midband gain of 40.8 dB and -3 dB bandwidth from 45 Hz to 5.32 kHz; the amplifier's input-referred noise was measured to be 3.06 [mu]Vrms, while consuming …
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The effects of cholinergic and dopaminergic neurons on hippocampal learning and memory processes
… examined their effects on hippocampal local field potentials in urethane-anaesthetised mice. I demonstrated that optogenetic cholinergic activation suppressed slow oscillations, shifting brain activity to a state dominated by theta and gamma oscillations. In contrast, dopaminergic activation …
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Beta oscillations in frontal cortex and striatum represent post-processing of successful behavior
… of beta activity in the brain, we recorded local field potentials in the frontal cortex and striatum of monkeys as they performed single and sequential arm movement tasks. To facilitate these experiments, we developed novel methods for recording simultaneously from independently moveable …
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Interactions between anticholinesterases in an in vitro central nervous system preparation
… by nerve agent. To test this, extracellular field potentials were recorded from the molecular layer of the dentate gyrus in an in vitro slice model developed from the guinea pig. This response was shown to be modulated by the application of physostigmine and the nerve agent sarin and …
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Investigation of the multiple-demand network at multiple spatial scales
… directly through single unit activity and local field potentials (LFPs), during a spatial working memory task. While single neurons showed dynamic coding of target information rather than persistent coding, LFPs held this information constant through time. The impact of reference voltages on LFP …
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