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Gaze-dependent evidence accumulation predicts multi-alternative risky choice behaviour.

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Gaze allocation influences choices, with longer fixation increasing selection probability. A gaze-dependent evidence accumulation model accurately predicts complex decision-making, incorporating value discounting for unfixed alternatives.

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Area of Science:

  • Cognitive psychology
  • Neuroscience
  • Decision science

Background:

  • Gaze allocation during deliberation influences choice probability.
  • Gaze-dependent evidence accumulation models explain simple decision scenarios.
  • Complex choice patterns, like attraction and compromise effects, require further investigation.

Purpose of the Study:

  • To test if gaze-dependent evidence accumulation predicts complex context-dependent choices.
  • To model choices and eye movements in a three-alternative risky choice task.
  • To evaluate gaze-dependence and other mechanisms in decision-making.

Main Methods:

  • A three-alternative risky choice task was used.
  • Choices and eye movements were recorded.
  • A gaze-dependent evidence accumulation model was applied and compared against a large model space.

Main Results:

  • Choices were best described by a gaze-dependent evidence accumulation model.
  • Subjective values were discounted when alternatives were not fixated.
  • Strong attraction effects were associated with an additional similarity-dependent inhibition mechanism.

Conclusions:

  • Gaze-dependent evidence accumulation is a key mechanism in complex choices.
  • Value discounting based on fixation is crucial.
  • Additional mechanisms, like similarity-dependent inhibition, are employed in specific contexts.