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Physiological pharmacokinetic models, often called flow-limited or perfusion models, typically assume a swift drug distribution between tissue and venous blood, creating a rapid drug equilibrium. This premise is based on the idea that drug diffusion is extremely fast, and the cell membrane presents no barrier to drug permeation. In this scenario, where no drug binding occurs, the drug concentration in the tissue equals that of the venous blood leaving the tissue. This greatly simplifies the...
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Reexamining the effects of speed-accuracy instructions with a diffusion-model-based analysis.

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Summary
This summary is machine-generated.

Decision-making components shift under speed or accuracy stress, primarily affecting boundary separation and non-decision time. Changes in drift rate variability compensate for its effects on accuracy and response time.

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Area of Science:

  • Cognitive psychology
  • Computational neuroscience

Background:

  • Understanding how cognitive processes adapt to task demands (speed vs. accuracy) is crucial.
  • Previous research often assumed fixed parameters during speed-accuracy trade-off (SAT) manipulations.

Purpose of the Study:

  • To investigate which parameters of the diffusion model change under speed and accuracy stress.
  • To examine the role of across-trial variability in drift rate.

Main Methods:

  • Applied the standard diffusion model to over one million responses from four large-scale experiments.
  • Allowed all model parameters to vary freely between speed and accuracy conditions.
  • Conducted a secondary analysis fixing across-trial drift rate variance.

Main Results:

  • Boundary separation and non-decision time were the most affected parameters under speed stress.
  • Drift rates showed minimal direct effects, but their across-trial variability changed, canceling out impacts on accuracy and response time.
  • High-stress conditions also reduced drift rates, potentially due to restricted encoding.

Conclusions:

  • Decision-making parameters, particularly boundary separation and non-decision time, are modulated by speed-accuracy instructions.
  • Across-trial variability in drift rate plays a key role in maintaining accuracy and response time consistency.
  • Severe speed stress may impair perceptual encoding, impacting multiple decision-making parameters.