Presence of strong harmonics during visual entrainment: a magnetoencephalography study.

Biological Psychology
Elizabeth Heinrichs-Graham, Tony W Wilson

Abstract

Visual neurons are known to synchronize their firing with stimuli that flicker at a constant rate (e.g. 12Hz). These so-called visual steady-state responses (VSSR) are a well-studied phenomenon, yet the underlying mechanisms are widely disagreed upon. Furthermore, there is limited evidence that visual neurons may simultaneously synchronize at harmonics of the stimulation frequency. We utilized magnetoencephalography (MEG) to examine synchronization at harmonics of the visual stimulation frequency (18Hz). MEG data were analyzed for event-related-synchronization (ERS) at the fundamental frequency, 36, 54, and 72Hz. We found strong ERS in all bands. Only 31% of participants showed maximum entrainment at the fundamental; others showed stronger entrainment at either 36 or 54Hz. The cortical foci of these responses indicated that the harmonics involved cortices that were partially distinct from the fundamental. These findings suggest that spatially-overlapping subpopulations of neurons are simultaneously entrained at different harmonics of the stimulus frequency.

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Citations

Jan 28, 2014·PloS One·Kristina L McFaddenDonald C Rojas
Aug 19, 2015·Journal of Cognitive Neuroscience·Yi-Feng WangHua-Fu Chen
Jun 13, 2019·Journal of Neural Engineering·Stefania CoelliAnna Maria Bianchi
Apr 28, 2017·Journal of Neurophysiology·Thomas NguyenVladimir Miskovic
May 7, 2019·Journal of Cognitive Neuroscience·Alex I Wiesman, Tony W Wilson
Jan 4, 2017·Cortex; a Journal Devoted to the Study of the Nervous System and Behavior·Elizabeth Heinrichs-GrahamTony W Wilson

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