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Published on: November 11, 2011
Cancellation of a planned movement in monkey motor cortex
Alexa Riehle1, Franck Grammont, William A MacKay
1Mediterranean Institute of Cognitive Neuroscience (INCM), National Center for Scientific Research (CNRS) and Aix-Marseille University, Marseille, France. alexa@incm.cnrs-mrs.fr
Neuroreport
|February 8, 2006
Summary
Researchers discovered that stopping planned movements involves activating opposite-direction neurons in the monkey motor cortex. This anti-directional activity halts the intended action, revealing a new mechanism for movement cancellation.
Area of Science:
- Neuroscience
- Motor Control
- Cognitive Neuroscience
Background:
- Stopping planned actions is vital for goal-directed behavior.
- The neural mechanisms underlying rapid movement cancellation are not fully understood.
Purpose of the Study:
- To investigate the neural activity in the motor cortex during the cancellation of planned movements.
- To identify the neuronal populations involved in inhibiting premature actions.
Main Methods:
- Electrophysiological recordings were performed in the motor cortex of monkeys.
- Monkeys were trained to prepare for an arm reach movement upon a GO signal.
- The GO signal was sometimes omitted to elicit movement cancellation.
Main Results:
- Abrupt cancellation of a prepared movement was associated with transient activation of anti-directional neurons.
- This anti-directional neural activity coincided with the cessation of movement-preparation signals.
- The findings suggest a neural mechanism for rapid action inhibition.
Conclusions:
- Functional interactions between opposing neuronal populations can rapidly alter motor cortex dynamics.
- This mechanism allows for the effective and abrupt cancellation of planned movements.
- Understanding movement cancellation offers insights into motor control and decision-making processes.
