Is gamma-band activity in the local field potential of v1 cortex a "clock" or filtered noise?

Samuel P. Burns, Dajun Xing, Robert Shapley

Research output: Contribution to journalArticle

Abstract

Gamma-band (25-90 Hz) peaks in local field potential (LFP) power spectra are present throughout the cerebral cortex and have been related to perception, attention, memory, and disorders (e.g., schizophrenia and autism). It has been theorized that gamma oscillations provide a "clock" for precise temporal encoding and "binding" of signals about stimulus features across brain regions. For gamma to function as a clock, it must be autocoherent: phase and frequency conserved over a period of time. We computed phase and frequency trajectories of gamma-band bursts, using time-frequency analysis of LFPs recorded in macaque primary visual cortex (V1) during visual stimulation. The data were compared with simulations of random networks and clock signals in noise. Gamma-band bursts in LFP data were statistically indistinguishable from those found in filtered broadband noise. Therefore, V1 LFP data did not contain clock-like gamma-band signals. We consider possible functions for stochastic gamma-band activity, such as a synchronizing pulse signal.

Original languageEnglish (US)
Pages (from-to)9658-9664
Number of pages7
JournalJournal of Neuroscience
Volume31
Issue number26
DOIs
StatePublished - Jun 29 2011

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Noise
Photic Stimulation
Memory Disorders
Macaca
Visual Cortex
Autistic Disorder
Cerebral Cortex
Schizophrenia
Brain

ASJC Scopus subject areas

  • Neuroscience(all)

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Is gamma-band activity in the local field potential of v1 cortex a "clock" or filtered noise? / Burns, Samuel P.; Xing, Dajun; Shapley, Robert.

In: Journal of Neuroscience, Vol. 31, No. 26, 29.06.2011, p. 9658-9664.

Research output: Contribution to journalArticle

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