Dissociation of broadband high-frequency activity and neuronal firing in the neocortex

Marcin Leszczyński, Annamaria Barczak, Yoshinao Kajikawa, Istvan Ulbert, Arnaud Y. Falchier, Idan Tal, Saskia Haegens, Lucia Melloni, Robert T. Knight, Charles E. Schroeder

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Broadband high-frequency activity (BHA; 70 to 150 Hz), also known as “high gamma,” a key analytic signal in human intracranial (electrocorticographic) recordings, is often assumed to reflect local neural firing [multiunit activity (MUA)]. As the precise physiological substrates of BHA are unknown, this assumption remains controversial. Our analysis of laminar multielectrode data from V1 and A1 in monkeys outlines two components of stimulus-evoked BHA distributed across the cortical layers: an “early-deep” and “late-superficial” response. Early-deep BHA has a clear spatial and temporal overlap with MUA. Late-superficial BHA was more prominent and accounted for more of the BHA signal measured near the cortical pial surface. However, its association with local MUA is weak and often undetectable, consistent with the view that it reflects dendritic processes separable from local neuronal firing.

Original languageEnglish
Article numbereabb0977
JournalScience advances
Issue number33
StatePublished - Aug 2020
Externally publishedYes

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