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The Trembling Hand Unraveled: Motor Dynamics and Choice Inconsistency.

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Human choice inconsistency is linked to both how we value options and our motor movements. This study reveals that motor dynamics predict inconsistency, even without value computations, suggesting multiple origins for inconsistent decision-making.

Keywords:
choice executionfMRIirrational choicemotor cognitionmouse trackingvalue-based decision–making

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Behavioral Economics

Background:

  • Humans exhibit significant inconsistency in decision-making.
  • The neural underpinnings of choice inconsistency are not fully understood.

Purpose of the Study:

  • To investigate the neural mechanisms of inconsistent choice.
  • To determine the role of valuation processes and motor dynamics in choice inconsistency.

Main Methods:

  • Conducted two behavioral and one neuroimaging study with 206 human participants.
  • Utilized a validated risky-choice task to measure inconsistency.
  • Analyzed mouse trajectories from novel tasks to assess motor dynamics independent of value computation.

Main Results:

  • Motor dynamics significantly predict choice inconsistency, independent of valuation.
  • Neuroimaging revealed that inconsistency is represented in both value and motor brain regions.
  • Findings were robust across different analysis strategies and studies.

Conclusions:

  • Inconsistent choice behavior likely arises from multiple cognitive processes, including valuation and motor control.
  • Models of choice inconsistency should incorporate heterogeneous sources of stochasticity.