Journal
TRENDS IN COGNITIVE SCIENCES
Volume 19, Issue 2, Pages 78-85Publisher
ELSEVIER SCIENCE LONDON
DOI: 10.1016/j.tics.2014.12.002
Keywords
gamma; excitation-inhibition; communication through coherence; phase coding; spike-LFP relationship; coherence
Funding
- Wellcome Trust/DBT India Alliance
- National Institutes of Health (NIH) [R01EY005911]
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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.
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