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Motor costs, not just visual stimuli, influence perceptual decisions. Even when accuracy suffers, people favor movements with lower biomechanical effort, impacting decision-making processes.

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Motor Control

Background:

  • Perceptual decision-making research typically assumes motor reports are independent of the decision process.
  • Recent findings suggest biomechanical costs can influence movement selection.
  • The influence of motor costs on perceptual decision accuracy remains largely unexplored.

Purpose of the Study:

  • To investigate if motor costs, independent of visual stimulus information, bias perceptual decisions.
  • To determine if biomechanical effort influences choice in a visual discrimination task, potentially at the expense of accuracy.

Main Methods:

  • A psychophysical experiment was conducted with human subjects.
  • Participants performed a random dot motion discrimination task.
  • Decisions were reported using movements with varying biomechanical costs.

Main Results:

  • A significant bias in decisions was observed favoring movements with lower biomechanical cost.
  • This bias persisted even when it led to reduced performance accuracy.
  • Decision-making was demonstrably influenced by motor costs, not solely by visual input.

Conclusions:

  • Motor costs play a significant role in perceptual decision-making during visual discrimination tasks.
  • This influence can occur even when motor costs are not instructed or beneficial.
  • Perceptual decisions are not entirely orthogonal to motor execution costs.