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Literature DB >> 25279772

Human intracranial high-frequency activity during memory processing: neural oscillations or stochastic volatility?

John F Burke¹, Ashwin G Ramayya¹, Michael J Kahana².

Abstract

Intracranial high-frequency activity (HFA), which refers to fast fluctuations in electrophysiological recordings, increases during memory processing. Two views have emerged to explain this effect: (1) HFA reflects a synchronous signal, related to underlying gamma oscillations, that plays a mechanistic role in human memory and (2) HFA reflects an asynchronous signal that is a non-specific marker of brain activation. We review recent data supporting each of these views and conclude that HFA during memory processing is more consistent with an asynchronous signal. Memory-related HFA is therefore best conceptualized as a biomarker of neural activation that can functionally map memory with high spatial and temporal precision.

Entities: Chemical Disease Gene Species

Mesh：

Year: 2014 PMID： 25279772 PMCID： PMC4675136 DOI： 10.1016/j.conb.2014.09.003

Source DB: PubMed Journal: Curr Opin Neurobiol ISSN： 0959-4388 Impact factor: 6.627

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