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An Emerging Target Paradigm to Evoke Fast Visuomotor Responses on Human Upper Limb Muscles
Published on: August 25, 2020
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Touch automatically upregulates motor readiness in humans.
Freek van Ede1, Tobias Winner2, Eric Maris3
1Donders Institute for Brain, Cognition and Behaviour, Radboud University, Nijmegen, The Netherlands; and Oxford Centre for Human Brain Activity, Department of Psychiatry, University of Oxford, Oxford, United Kingdom.
Journal of Neurophysiology
|September 25, 2015
Summary
Tactile stimuli that match movement location improve reaction speed and accuracy in a button-press task. This sensory-motor integration enhances motor readiness, but not through beta oscillation changes.
Area of Science:
- Neuroscience
- Human Motor Control
- Somatosensory Processing
Background:
- Goal-directed movements rely on integrating sensory information with motor commands.
- Tactile input can influence motor system activity and performance.
Purpose of the Study:
- To investigate how spatially congruent tactile stimuli affect motor task performance in healthy humans.
- To explore the neural mechanisms, specifically somato-motor beta oscillations, underlying this tactile-motor integration using magnetoencephalography (MEG).
Main Methods:
- Healthy participants performed a speeded button-press task while receiving spatially congruent or incongruent tactile stimuli.
- Magnetoencephalography (MEG) was used to measure brain activity, focusing on somato-motor beta oscillations (13-30 Hz).
Main Results:
- Congruent tactile stimuli significantly improved response speed and accuracy, even when task-irrelevant.
- This facilitatory effect on motor readiness was specific to tactile input, independent of hand separation, and persisted for up to one second.
- Tactile-induced modulation of beta oscillations did not correlate with the observed behavioral improvements, suggesting it does not mediate the facilitation.
Conclusions:
- Spatially congruent tactile input automatically enhances motor readiness and task performance.
- The observed behavioral effects are not explained by the modulation of somato-motor beta oscillations, indicating alternative neural pathways or mechanisms are involved.
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