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Secondary motor integration as a final arbiter in sensorimotor decision-making.

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This study reveals motor processes actively shape sensorimotor decisions, not just follow them. A secondary leaky accumulator in motor systems better explains decision-making than single accumulation models.

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Area of Science:

  • Cognitive Neuroscience
  • Computational Neuroscience
  • Human Motor Control

Background:

  • Sensorimotor decision-making models traditionally focus on a single sensory evidence accumulation stage before motor planning.
  • Existing theories often overlook the potential contribution of motor system dynamics during the decision-making process itself.

Purpose of the Study:

  • To propose and test a novel framework where motor processes actively participate in decision formation through a secondary leaky accumulator.
  • To investigate the role of motor leak in adapting temporal smoothing and the lag between sensory and motor evidence integration.

Main Methods:

  • Formal model comparison was employed to contrast the proposed dual-accumulator model against single-accumulator variants.
  • Behavioral data, including choice and response times, were collected from human observers performing a categorical decision task under varying speed-accuracy trade-offs.
  • Electroencephalography (EEG) data were recorded to identify neural correlates of the proposed integration processes.

Main Results:

  • The proposed model with a secondary leaky motor accumulator provided a superior fit to behavioral data compared to single-accumulator models.
  • Behavioral adjustments under speed-accuracy trade-offs were better explained by changes in the motor accumulator's leak rather than decision boundary adjustments.
  • Neural activity patterns derived from EEG data aligned with the predictions of the dual-accumulator model, supporting its neurobiological plausibility.

Conclusions:

  • Sensorimotor decision-making involves a dynamic interplay between sensory evidence accumulation and a secondary leaky motor accumulation process.
  • The motor system's leak is crucial for adapting temporal integration and the timing of decisions, challenging traditional single-accumulator views.
  • This framework offers a neurobiologically grounded explanation for the active role of motor processes in shaping choice behavior.