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Electroencephalographic Study on Sensory Integration in Visually Induced Postural Sway.

Takahiro Kagawa¹, Scott Makeig², Makoto Miyakoshi²

¹Aichi Institute of Technology.

Journal of Cognitive Neuroscience

|December 7, 2020

Summary

Visually induced postural sway (VIPS) involves early visual cortex activity, not the dorsal stream. Light finger touch suppresses VIPS by modulating alpha band activity in the occipital cortex.

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Area of Science:

Neuroscience
Human Physiology
Visual Perception

Background:

Visually induced postural sway (VIPS) is an involuntary body sway triggered by optic flow.
VIPS is known to be suppressed by light tactile input.
The neural underpinnings of VIPS, particularly the involvement of the dorsal visual stream, remain unclear.

Purpose of the Study:

To investigate whether VIPS is mediated by parietal cortex activity in the dorsal visual stream or by early visual areas.
To explore the differences in cortical processing between VIPS and voluntary visuomotor control.

Main Methods:

A mobile brain/body imaging study using high-density electroencephalography (EEG).
Participants stood while exposed to reversing optic flow, with and without light finger touch.
Visuo-postural tracking movements were recorded to compare voluntary visuomotor control.

Main Results:

Alpha band activity (8-13 Hz) in the occipital cortex was modulated by optic flow and increased with light touch during VIPS.
Parietal cortex activity showed no modulation related to optic flow or touch during VIPS.
Voluntary postural sway involved different theta (4-7 Hz) and beta (14-35 Hz) band activity in sensorimotor areas compared to VIPS.

Conclusions:

VIPS appears to involve dynamic changes in the early visual cortex.
The posterior parietal cortex of the dorsal visual stream is likely not the primary mediator of VIPS.
Tactile input modulates VIPS through changes in early visual processing.