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Corrective response times in a coordinated eye-head-arm countermanding task
Gordon Tao1,2,3, Aarlenne Z Khan2,4, Gunnar Blohm1,2,3
1Centre for Neuroscience Studies, Queen's University , Kingston, Ontario , Canada.
Journal of Neurophysiology
|February 22, 2018
Summary
Erroneous movements occur when motor inhibition fails. Corrective movements are initiated rapidly after the inhibition signal reaches a decision threshold, suggesting residual neural effects from failed decisions.
Area of Science:
- Neuroscience
- Motor Control
- Cognitive Science
Background:
- Motor responses involve competing processes of initiation and inhibition.
- Failed inhibition leads to erroneous movements requiring correction (corrective response times, CRTs).
Purpose of the Study:
- Investigate mechanisms of multiple effector coordination (eye-head-arm).
- Determine the timing and neural basis of corrective responses.
Main Methods:
- Used a combined eye-head-arm movement countermanding task.
- Analyzed reaction times (RT), stop-signal reaction times (SSRT), and CRTs.
- Modeled RT, SSRT, and CRT distributions using an extended LATER race model.
Main Results:
- High correlation observed between RT, SSRT, and CRT across effectors.
- Decision processes are strongly interdependent across different motor systems.
- The best-fit model indicates an expedited inhibition process for CRTs.
Conclusions:
- Neural processing of failed decisions impacts subsequent actions.
- Corrective movements in coordinated tasks are triggered by an accelerated inhibition signal.
- This suggests a residual neural effect influencing corrective action timing.
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