Apr 17, 2020

Turning the stimulus on and off dynamically changes the direction of alpha travelling waves

BioRxiv : the Preprint Server for Biology
Z. PangRufin VanRullen


Travelling waves have been studied to characterize the complex spatiotemporal dynamics of the brain. Several studies have suggested that the propagation direction of travelling waves can be task-dependent. For example, a recent EEG study from our group found that forward waves (i.e. occipital to frontal, FW waves) were observed during visual processing, whereas backward waves (i.e. frontal to occipital, BW waves) mostly occurred in the absence of sensory input. These EEG recordings, however, were obtained from different experimental sessions and different groups of subjects. To further examine how the waves' direction changes between task conditions, 13 participants were tested on a target detection task while EEG signals were recorded simultaneously. We alternated visual stimulation (5 s display of visual luminance sequences) and resting state (5 s of black screen) within each single trial, allowing us to monitor the moment-to-moment progression of travelling waves. As expected, the waves' direction was closely linked with task conditions (visual processing vs. rest state). First, FW waves from occipital to frontal regions, absent during rest, emerged as a result of visual processing, while BW waves in the opposite direction d...Continue Reading

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YARS2 gene
Nerve Degeneration
MAPT protein, human
Alzheimer's Disease
Radiotherapy, Conformal

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