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Body dynamics of gait affect value-based decisions.

Eric Grießbach1, Francesca Incagli2, Oliver Herbort2

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Value-based decisions are influenced by our movements. Even while walking, the body's gait dynamics can bias choices, sometimes leading to less reward.

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Area of Science:

  • Cognitive Neuroscience
  • Decision Science
  • Biomechanics

Background:

  • Decision-making research often assumes choices are made with known costs and benefits.
  • Real-life decisions, like grocery shopping, occur dynamically during movement.
  • Action costs can change during locomotion.

Purpose of the Study:

  • To investigate if gait dynamics influence value-based choices.
  • To determine if concurrent action dynamics affect decision-making processes.

Main Methods:

  • Three experiments were conducted where participants made choices while walking.
  • Participants decided between lateral targets associated with different rewards.
  • Stepping behavior and choice outcomes were recorded.

Main Results:

  • Choice selection was significantly biased by alternating stepping patterns.
  • This bias occurred even when it led to lower rewards.
  • Gait dynamics demonstrably affected value-based decision outcomes.

Conclusions:

  • Whole-body action dynamics, specifically gait, are integral to value-based decision-making.
  • Movement and decision processes are coupled, not independent.
  • Future research should consider motor dynamics in decision models.