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. 2023 Aug 7;17:1206120. doi: 10.3389/fnins.2023.1206120

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Copyright © 2023 Gruenwald, Sieghartsleitner, Kapeller, Scharinger, Kamada, Brunner and Guger.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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High-gamma activity: context and principles. (A) Exemplary cognitive and behavioral tasks involving memory, language, auditory, visual, and motor function. (B) Cortical region corresponding to such a cognitive or behavioral task. Black dots illustrate exemplary locations of implanted ECoG electrodes. (C) Typical task-related spectral change of a brain signal recorded at such a cortical region. Yellow shading illustrates the power increase due to HGA. (D) Typical time course of an ECoG signal acquired by a biosignal amplifier from a cortical region involved in the task. (E) Signal processing pipeline that estimates HGA from ECoG recordings. (F) Typical time course of estimated HGA. (G) HGA types associated with cognitive and behavioral tasks. (H–J) Illustration of the fundamental signal properties, i.e., the high-gamma frequency band, the HGA bandwidth, and the temporal dynamics of HGA.