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 11 of 11 for “"Theta rhythm"”.
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ELECTROENCEPHALOGRAPHIC AND ELECTROMYOGRAPHIC BIOFEEDBACK TRAINING OF OCCIPITAL LOBE THETA RHYTHM
… subjects to enhance levels of occipital lobe theta electro-encephalographic rhythms. It was hypothesized that the subject's level of physiological arousal would differentially influence the effectiveness of the training methods. The independent variables were: (1) baseline arousal, (2) …
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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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Phase-locking of neurons in the hippocampus and the medial prefrontal cortex of the rat to the hippocampal theta rhythm
… of freely behaving rats and the hippocampal theta rhythm. We demonstrate that a significant portion of prefrontal neurons are phase-locked to the hippocampal theta rhythm and we compare the phase-locking properties of prefrontal and hippocampal cells. We also show that prefrontal neurons …
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Mnemonic information in the rodent hippocampus during wake and sleep states
… modulation of the subcortically driven theta rhythm is also reproduced.
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Alternating Sequences of Future and Past Behavior Encoded Within Hippocampal Theta Oscillations
… precession" relative to the ongoing 4-12 Hz theta rhythm, firing at progressively earlier phases of theta as the rat traverses a cell's place field. Across large populations of place cells, phase precession is hypothesized to produce theta sequences, temporally organized sequences of neural …
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A Closer Look at Classical Measurement, an Algorithm for Deliberation in Rodents, and a Conjecture on Intertemporal Choice
… a wide range of observed phenomena, such as the theta rhythm, the slow oscillation, spindle oscillations, sharp wave-ripples, θ-sequences, for-ward and reverse SWR-sequences, the formation and strengthening of episodic memories, and a need for two modes of operation—online and offline. The two …
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The effects of periodic and non-periodic inputs on the dynamics of a medial entorhinal cortex layer II stellate cell model
… and firing frequency resonance in the theta frequency band (4 - 10 Hz). In this thesis we seek to understand the biophysical and dynamic mechanism underlying these phenomena and how they are related. We studied the effects of sinusoidal current and synaptic conductance inputs at various …
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Central autonomic control in spontaneously hypertensive rats: a study on phasic phenomena during rapid-eye-movement sleep
… states. In non rapid-eye-movement sleep, heart rhythm is under prevalent baroreflex control, whereas in rapid-eye-movement sleep central autonomic commands prevail (Zoccoli et al., 2001). Moreover, during rapid-eye-movement sleep the cardiovascular variables show wide fluctuations around their …
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Συγκριτική μελέτη της ρυθμικής δραστηριότητας που αναπτύσσεται σε τομές ραχιαίου και κοιλιακού ιπποκάμπου αρουραίου με αγωνιστή υποδοχέων ακετυλοχολίνης
Οι in vivo θ και γ ρυθμοί στον ιππόκαμπο συνυπάρχουν και θεωρείται ότι συμμετέχουν στην διαδικασία δημιουργίας και ανάκλησης των μνημονικών αναπαραστάσεων. Σε τομές ιπποκάμπου in vitro, βρήκαμε όμως ότι διαφοροποιείται η ικανότητα επαγωγής αυτών των ρυθμών στο κοιλιακό σε σχέση με το ραχιαίο άκρο …
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Mechanisms of hippocampal relational memory binding
… model were subject to an extrinsically generated theta rhythm, and a locally generated gamma rhythm. This allowed the model to do more than simply generate conjunctions corresponding to previous inputs. First, the model treats dynamics of the entire entorhinal cortex as a superposition of the …