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Large-scale network-level processes during entrainment
VerfasserLithari, Chrysa ; Sánchez-García, Carolina ; Ruhnau, Philipp ; Weisz, Nathan
Erschienen in
Brain Research, Amsterdam, 2016, Jg. 2016, H. 1635, S. 143-152
ErschienenElsevier, 2016
DokumenttypAufsatz in einer Zeitschrift
Schlagwörter (EN)Visual steady-state / Graph theory / Global density / Node degree / Seeded connectivity / Functional connectivity / Entrainment
URNurn:nbn:at:at-ubs:3-6924 Persistent Identifier (URN)
 Das Werk ist frei verfügbar
Large-scale network-level processes during entrainment [4.37 mb]
Zusammenfassung (Englisch)

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 (430 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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