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Motor decision-making under uncertainty and time pressure.

Samuele Contemori1, Timothy J Carroll1

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|January 21, 2025
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Summary
This summary is machine-generated.

The brain selects one action plan for movement, rather than averaging multiple options, even with rapid responses to uncertain targets. This indicates motor commands are specified after action selection.

Keywords:
decision-makingmotor learningmotor planningtime pressureuncertainty

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Area of Science:

  • Neuroscience
  • Motor Control
  • Cognitive Science

Background:

  • Purposeful movement involves selecting actions from alternatives.
  • The brain's process for representing and selecting actions under uncertainty is debated.
  • Two hypotheses exist: motor averaging versus single optimized plan preparation.

Purpose of the Study:

  • To investigate how the brain represents and selects actions when movement initiation precedes full goal identification.
  • To differentiate between motor averaging and single plan preparation hypotheses.

Main Methods:

  • Modified a previous experiment involving reaching movements towards targets with opposing force fields.
  • Participants initiated movements rapidly (approx. 250 ms reaction time) under target uncertainty.
  • Analyzed reaching dynamics to determine if they reflected averaged or selected motor plans.

Main Results:

  • Reaching dynamics consistently reflected the learned dynamics of the selected reach direction only.
  • No evidence of 'motor averaging' was observed, even with immediate movement initiation.
  • Movement dynamics were specified downstream of action selection.

Conclusions:

  • Action selection precedes the specification of reaching dynamics under target uncertainty.
  • The brain prepares a single, optimized motor plan for execution, not an average of alternatives.
  • Findings support the hypothesis that motor decisions are finalized upstream of motor planning circuits.