Chapter

Dynamic Spectral Imaging: Online and Offline Functional Brain Mapping Using High-Frequency Activity [50–150 Hz] in SEEG

Jean-Philippe Lachaux

in Invasive Studies of the Human Epileptic Brain

Published on behalf of Oxford University Press

Published in print November 2018 | ISBN: 9780198714668
Published online December 2018 | e-ISBN: 9780191782954 | DOI: https://dx.doi.org/10.1093/med/9780198714668.003.0033
Dynamic Spectral Imaging: Online and Offline Functional Brain Mapping Using High-Frequency Activity [50–150 Hz] in SEEG

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At the end of the twentieth century, a handful of research groups discovered that neural processing leaves a characteristic signature in intracranial EEG recordings: an increase of power in a broad frequency range above 50 Hz, dubbed ‘high-gamma’ of high-frequency activity ([50–150 Hz]). Since then, intracranial EEG research on human cognition has focused primarily on high-gamma activity to reveal the large-scale cortical dynamics of most major cognitive functions, not only offline in well-controlled paradigms, but also online, while patients freely interact with their environment. This chapter introduces that approach, including its recent extension to task-induced neural activity suppressions and functional connectivity mapping, and its clinical application to minimize cognitive deficits induced by epilepsy surgery.

Chapter.  8536 words.  Illustrated.

Subjects: Neurology ; Neuroscience

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