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Corticospinal Excitability Modulation During Action Observation

Corticospinal Excitability Modulation During Action Observation

Published on: December 31, 2013

Shared Physiological Correlates of Multisensory and Expectation-Based Facilitation.

Stephanie J Kayser^1,2, Christoph Kayser^3,4

¹Department for Cognitive Neuroscience, Faculty of Biology, Bielefeld University, Bielefeld 33615, Germany.

|February 21, 2020

Summary

This summary is machine-generated.

Both multisensory cues and symbolic cues improve visual perception by enhancing neural encoding. This suggests overlapping brain mechanisms process both types of information, indicating a flexible neural system for expectation.

Keywords:

EEG cueing expectation multisensory visual perception

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Area of Science:

Cognitive Neuroscience
Human Perception
Electrophysiology

Background:

Perceptual performance can be enhanced by multisensory information or by symbolic cues that create expectations.
It remains unclear whether these distinct cueing methods rely on shared or separate neurophysiological processes.

Purpose of the Study:

To investigate the neural mechanisms underlying the benefits of multisensory versus symbolic cues on visual perception.
To compare the influence of acoustic motion, premotion visual symbolic cue, and postmotion symbolic cue on visual motion discrimination.

Main Methods:

Human participants performed a visual motion discrimination task.
Electroencephalography (EEG) data were recorded and analyzed using multivariate techniques.
The influence of three types of auxiliary probabilistic cues (acoustic motion, premotion visual symbolic, postmotion symbolic) was assessed.

Main Results:

Both multisensory (acoustic motion) and preceding visual symbolic cues enhanced the encoding of visual motion direction.
This enhancement was reflected in occipital EEG activity between 200-400 ms post-stimulus onset.
Prestimulus alpha power differentially modulated the integration of acoustic cues but not visual symbolic cues.

Conclusions:

A common or overlapping neural mechanism supports the processing of both cross-modal and intramodal auxiliary information.
The brain exhibits a neural mechanism sensitive to both multisensory and abstract probabilistic cues.
Prestimulus activity plays a differential role in integrating multisensory versus abstract symbolic cues.