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Updated: Mar 1, 2026
09:48
Intracortical Inhibition Within the Primary Motor Cortex Can Be Modulated by Changing the Focus of Attention
Published on: September 11, 2017
10.4K
Perceptual surprise aides inhibitory motor control
1Department of Psychological and Brain Sciences, University of Iowa.
Summary
Unexpected sounds can enhance motor inhibition, but only if timed correctly. Presenting sounds shortly after a NoGo-stimulus improved the ability to withhold responses, supporting the role of inhibitory control.
Area of Science:
- Neuroscience
- Cognitive Psychology
Background:
- Neurophysiological studies indicate unexpected sounds elicit motor inhibition.
- Previous research suggested unexpected sounds improve response inhibition in Go/NoGo tasks.
Purpose of the Study:
- To investigate the critical timing of unexpected sounds for modulating motor inhibition.
- To re-evaluate the effect of unexpected sounds on response inhibition in a Go/NoGo task with adjusted timing.
Main Methods:
- Replication of Leiva et al. (2015) study with a key modification in sound presentation timing.
- Task-irrelevant sounds presented 50 ms after NoGo-stimulus onset across four experiments.
Main Results:
- Unexpected sounds presented 50 ms after NoGo-stimuli significantly increased successful response withholding.
- This timing ensured cortico-motor inhibition coincided with the period of required motor inhibition.
Conclusions:
- The timing of unexpected events is crucial for their influence on motor inhibition.
- Unexpected sounds, when appropriately timed, can engage inhibitory control processes and enhance the ability to withhold motor responses.
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