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2017
In many brain structures, in particular in the hippocampus, gamma oscillations appear near the crests of much slower, 4–11 Hz oscillations, called theta oscillations or theta rhythms. For an example, see Fig. 34.1.
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In many brain structures, in particular in the hippocampus, gamma oscillations appear near the crests of much slower, 4–11 Hz oscillations, called theta oscillations or theta rhythms. For an example, see Fig. 34.1.
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Intracerebral study of gamma rhythm reactivity in the sensorimotor cortex
European Journal of Neuroscience, 2005AbstractThe generators and functional correlates of gamma oscillations within the sensorimotor cortex remain unclear. With the goal of locating the oscillations' sources precisely and then studying the relationship between oscillatory reactivity and ongoing movement, we recorded stereoelectroencephalograms with intracerebral electrodes in eight ...
Szurhaj, William +5 more
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Gamma Rhythms and Cell Assemblies
2017In Section 33.2, we mentioned Hebb’s idea of cell assemblies. The hypothesis is that information is carried by membership in neuronal ensembles that (temporarily) fire together. One attractive aspect of this idea is that it would give a brain with 1011 neurons an unfathomably large storage capacity, since the number of subsets of a large set is huge.
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A stochastic model of input effectiveness during irregular gamma rhythms
Journal of Computational Neuroscience, 2015Gamma-band synchronization has been linked to attention and communication between brain regions, yet the underlying dynamical mechanisms are still unclear. How does the timing and amplitude of inputs to cells that generate an endogenously noisy gamma rhythm affect the network activity and rhythm?
Dumont, Grégory +2 more
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Mechanisms of Cortical Electrical Activity and Emergence of Gamma Rhythm
Journal of Theoretical Biology, 2000A continuum model of the electrical activity of the cerebral cortex is described which predicts the occurrence of a resonance in the gamma range near 40 Hz. The emergence of this resonance is due to two refinements to a previous model, namely the inclusion of a modulation of synaptic strength due to finite reversal potentials, and use of parameters ...
C J, Rennie, J J, Wright, P A, Robinson
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The PING Model of Gamma Rhythms
2017When populations of excitatory and inhibitory neurons are synaptically connected, oscillations often emerge. The reason is apparent: Activity of the excitatory neurons (which we will call E-cells from here on, as we did in Chapter 22) generates activity of the inhibitory neurons (I-cells).
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Generation of Theta and Gamma Rhythms in the Hippocampus
Neuroscience & Biobehavioral Reviews, 1998In the behaving rat, theta rhythm was dominant during walking and rapid-eye-movement sleep, while irregular slow activity predominated during immobility and slow-wave sleep. Oscillatory evoked potentials of 20-50 Hz and spontaneous fast (gamma) waves were more prominent during theta compared with non-theta behaviors.
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Multiple origins of the cortical gamma rhythm
Developmental Neurobiology, 2010AbstractGamma rhythms (30–80 Hz) are a near‐ubiquitous feature of neuronal population activity in mammalian cortices. Their dynamic properties permit the synchronization of neuronal responses to sensory input within spatially distributed networks, transient formation of local neuronal “cell assemblies,” and coherent response patterns essential for ...
Whittington MA +4 more
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Simulation of Gamma Rhythms in Networks of Interneurons and Pyramidal Cells
Journal of Computational Neuroscience, 1997Networks of hippocampal interneurons, with pyramidal neurons pharmacologically disconnected, can generate gamma-frequency (20 Hz and above) oscillations. Experiments and models have shown how the network frequency depends on excitation of the interneurons, and on the parameters of GABAA-mediated IPSCs between the interneurons (conductance and time ...
Traub, Roger D. +2 more
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Gamma rhythms as liminal operators in sensory processing
Behavioral and Brain Sciences, 2004Gamma rhythms are associated with external and internal sensory processing. Within the conceptual framework of “top-down” and “bottom-up” processing, this suggests that gamma represents a format common to both camps. As these oscillations facilitate communication in the temporal domain, they may represent a mechanism by which top-down and bottom-up ...
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