"Traub, Jefferys, and Whittington have provided the clearest
mechanistic explanation (for hippocampus) to date of oscillations of a
type that occur in many brain areas."
-- Charles F. Stevens, Salk Institute
The study of cortical oscillations is of great interest to those
working in many areas of neuroscience. A fast coherent EEG rhythm
called gamma or "40 Hz" has been implicated in cognition, as it may
play a role in binding together features of objects. This rhythm may
also be important for consciousness, as a number of drugs that induce
general anesthesia disrupt the synchronization of the rhythm at
clinically relevant concentrations. There is also suggestive evidence
implicating dysfunction of gamma rhythms in Alzheimer's disease, and
perhaps in other neuropsychiatric disorders.
In Fast Oscillations in Cortical Circuits, the authors
use a combination of electrophysiological and computer modeling
techniques to analyze how large networks of neurons can produce both
epileptic seizures and functionally relevant synchronized
oscillations. Specific topics covered include single hippocampal
pyramid cells, hippocampal interneurons, synaptic interactions, gamma
oscillations in brain slices as well as in vivo, the mechanisms of
oscillation-synchronization (both local and long-range), the switch
from gamma to beta frequencies and its implications for memory, and
the significance of gamma oscillations for brain function.
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