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Visual Salience Controls the Speed of Evidence Accumulation in Value-Based Decisions by Rats.

Jensen A Palmer, Kevin Chavez Lopez, Mark Laubach

    Biorxiv : the Preprint Server for Biology
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    Visual cue salience, not just reward value, influences rodent decisions. Changes in stimulus brightness altered decision speed and accuracy, showing perception shapes evidence accumulation in value-based choices.

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    Area of Science:

    • Neuroscience
    • Decision Science
    • Animal Behavior

    Background:

    • Value-based decision-making research often struggles to separate cue salience from reward value.
    • Understanding how sensory perception influences choice behavior is critical.

    Purpose of the Study:

    • To investigate the independent effect of visual cue salience on value-based decision-making in rats.
    • To differentiate the roles of sensory perception and reward value in guiding choices.

    Main Methods:

    • Rats performed a two-alternative forced-choice task with varying visual cue luminances and constant reward values.
    • A "luminance shift" test introduced intermediate cues to assess perceptual similarity effects.
    • Drift diffusion modeling was used to analyze decision dynamics, specifically drift rate and decision threshold.

    Main Results:

    • Rats maintained preference for higher-value options despite luminance shifts.
    • Introducing perceptually similar cues reduced choice preference and eliminated latency differences.
    • Drift diffusion modeling indicated luminance shifts primarily reduced drift rate (evidence accumulation speed), not decision threshold.

    Conclusions:

    • Visual salience significantly impacts the efficiency of evidence accumulation in value-based decisions.
    • Low-level perceptual features shape the computational dynamics of choice, distinct from prefrontal cortex roles.
    • Sensory input and cognitive control (prefrontal cortex) have separate, identifiable contributions to decision processes.