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 12 of 12 for “"Theta oscillations"”.
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EEG theta oscillations during sleep deprivation
Brain oscillations of different frequencies characterize the electroencephalogram (EEG) during distinct cognitive and vigilant states. Theta oscillations (4-8 Hz) are unusual because they have been found in the near-opposite conditions of sleepiness and alert cognitive control. Most neuroscience …
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Theta oscillations, timing and cholinergic modulation in the rodent hippocampal circuit
… field potential and neuronal spiking. Gamma oscillations (>40Hz) are mediatepd by local circuitry and interact with slower theta oscillations (6-10 Hz). Both oscillation frequencies are modulated by cholinergic input from the medial septum. Entorhinal grid cells fire when an animal visits …
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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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Electrophysiological Signatures of Spatial and Temporal Coding in Humans
… related to memory and navigation are neural oscillations in cortical and subcortical regions (such as the hippocampus). The presence of cortical and hippocampal theta oscillations predicts better subsequent memory and more efficient spatial navigation, but the exact relationship between …
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Forebrain Acetylcholine in Action: Dynamic Activities and Modulation on Target Areas
… and its interaction with field potential theta oscillations, I developed a novel technique to acquire second-by-second electrophysiological and neurochemical information simultaneously with amperometry. Using this technique on anesthetized rats, I discovered for the first time the tight …
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Timing and hippocampal information processing
… neurons in hippocampal subregion CAl, where theta oscillations organize groups of neurons into orderly sequences. While theta was once thought to be synchronized throughout CAl, it was recently shown instead to be offset in time along the long axis of the hippocampus. Considering distant …
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A central medullary circuit regulating REM sleep and pontine waves
… composed of tonic features such as hippocampal theta oscillations and skeletal muscle paralysis, which are interleaved with short-lived phasic events such as rapid eye movements, limb twitches, and spike-like pontine (P)-waves. Considered a key hallmark of REM sleep, P-waves are coupled with …
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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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Investigating the effects of oscillating sounds on the memory of older populations
… Memory functions are associated with various oscillations of electrical activity in the brain, and disruptions of those rhythms can be observed in many neurological syndromes, including Alzheimer’s Disease. Oscillations at the theta (3-7 Hz) frequency, in particular, are thought to play an …
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Granular retrosplenial cortex layer 2/3 generates high frequency oscillation events coupled with hippocampal sharp wave-ripples and Str. LM high gamma
… (LFP), these processes take the form of theta and sharp wave ripples (SPW-Rs) for encoding and consolidation, respectively. As an animal runs through an environment, neurons become active at specific locations in the environment (place cells) increasing their firing rate, functionally …
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Interpersonal influences in human visual attention: from behaviour to EEG.
… Event-related potentials (ERPs) and neural oscillations suggested that the effect was driven by a cognitive control process, and also showed an enhancement in the early sensory level information processing in the brain. Both the N2b ERP component and mid-frontal theta oscillations pointed …
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Shedding light on memory retrieval: reactivation of related information and its association with the hippocampus
… of oscillatory activity, particularly in the theta band, has been suggested as a possible route through which the hippocampus communicates with sensory cortices. The second experiment combined data from two previous studies using the same face-scene pair study paradigm and examined whether …