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Trends Cogn Sci. 2015 Feb;19(2):78-85. doi: 10.1016/j.tics.2014.12.002. Epub 2014 Dec 30.

Do gamma oscillations play a role in cerebral cortex?

Author information

1
Centre for Neuroscience, Indian Institute of Science, Bangalore 560012, India.
2
Department of Neurobiology, University of Chicago, 5812 South Ellis Avenue, MC0912 Chicago, IL 60637, USA. Electronic address: maunsell@uchicago.edu.

Abstract

Gamma rhythm (which has a center frequency between 30 and 80 Hz) is modulated by cognitive mechanisms such as attention and memory, and has been hypothesized to play a role in mediating these processes by supporting communication channels between cortical areas or encoding information in its phase. We highlight several issues related to gamma rhythms, such as low and inconsistent power, its dependence on low-level stimulus features, problems due to conduction delays, and contamination due to spike-related activity that makes accurate estimation of gamma phase difficult. Gamma rhythm could be a potentially useful signature of excitation-inhibition interactions in the brain, but whether it also provides a mechanism for information processing or coding remains an open question.

KEYWORDS:

coherence; communication through coherence; excitation–inhibition; gamma; phase coding; spike–LFP relationship

PMID:
25555444
PMCID:
PMC5403517
DOI:
10.1016/j.tics.2014.12.002
[Indexed for MEDLINE]
Free PMC Article
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