Large-scale network-level processes during entrainment

Brain Research
Chrysa LithariNathan Weisz

Abstract

Visual rhythmic stimulation evokes a robust power increase exactly at the stimulation frequency, the so-called steady-state response (SSR). Localization of visual SSRs normally shows a very focal modulation of power in visual cortex and led to the treatment and interpretation of SSRs as a local phenomenon. Given the brain network dynamics, we hypothesized that SSRs have additional large-scale effects on the brain functional network that can be revealed by means of graph theory. We used rhythmic visual stimulation at a range of frequencies (4-30 Hz), recorded MEG and investigated source level connectivity across the whole brain. Using graph theoretical measures we observed a frequency-unspecific reduction of global density in the alpha band "disconnecting" visual cortex from the rest of the network. Also, a frequency-specific increase of connectivity between occipital cortex and precuneus was found at the stimulation frequency that exhibited the highest resonance (30 Hz). In conclusion, we showed that SSRs dynamically re-organized the brain functional network. These large-scale effects should be taken into account not only when attempting to explain the nature of SSRs, but also when used in various experimental designs.

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Citations

Oct 5, 2016·Psychophysiology·Matthias J WieserAndreas Keil
Jul 19, 2018·Experimental Brain Research·Roxane De KeyserValéry Legrain
Apr 28, 2017·Journal of Neurophysiology·Thomas NguyenVladimir Miskovic
May 29, 2021·Psychophysiology·Valeria BekhterevaMatthias M Müller
May 21, 2021·Cortex; a Journal Devoted to the Study of the Nervous System and Behavior·Marius KeuteTino Zaehle

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