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The "Motor" in Implicit Motor Sequence Learning: A Foot-stepping Serial Reaction Time Task
Published on: May 3, 2018
Motor preparation in an anticipation-timing task.
Anthony N Carlsen1, Romeo Chua, J Timothy Inglis
1School of Human Kinetics, University of British Columbia, Vancouver, BC, Canada. carlsen@interchange.ubc.ca
Experimental Brain Research
|July 24, 2008
Summary
A startling stimulus was used to investigate motor preparation in anticipation-timing tasks. Results show that motor commands are not fully pre-programmed in subcortical pathways before movement initiation, even with startling stimuli.
Area of Science:
- Neuroscience
- Motor Control
- Human Movement Science
Background:
- Anticipation-timing tasks reveal a potential point of no return for pre-programmed movements.
- Startling stimuli may trigger pre-programmed responses in reaction time tasks, potentially bypassing the cerebral cortex.
Purpose of the Study:
- To investigate the temporal course of motor preparation during a stop-signal anticipation-timing task using a startling stimulus.
- To determine if subcortical pathways complete motor command pre-programming and storage before response production.
Main Methods:
- Participants performed a key release task timed to a clock hand's sweep.
- A stop signal was presented on some trials, accompanied by either a startling (124 dB) or control (82 dB) acoustic stimulus.
- The temporal window for motor command preparation was examined.
Main Results:
- Advance preparation of motor circuits was observed.
- Subcortical pre-programming and storage of motor commands were not completed substantially in advance of response production.
- This suggests a limited window for motor command finalization in common pathways.
Conclusions:
- Motor preparation in anticipation-timing tasks involves complex temporal dynamics.
- Subcortical pathways may not fully pre-program and store motor commands long before voluntary or startle-elicited movements.
- The findings contribute to understanding the neural basis of motor timing and response inhibition.
