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Using diffusion models for symbolic numeracy tasks to examine aging effects.

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This summary is machine-generated.

Older adults show increased non-decision time in numeracy tasks. While decision evidence increased for some tasks, decision speed decreased in memory tasks, revealing age-related cognitive changes.

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Area of Science:

  • Cognitive Psychology
  • Neuroscience of Aging
  • Quantitative Psychology

Background:

  • Symbolic numeracy is crucial for daily life.
  • Aging impacts cognitive functions, including numerical processing.
  • Diffusion models offer a framework to analyze decision-making processes.

Purpose of the Study:

  • To investigate age-related changes in symbolic numeracy using model-based analysis.
  • To examine how aging affects different components of decision-making in number tasks.
  • To identify consistent individual differences in cognitive processes across tasks.

Main Methods:

  • Utilized three symbolic numeracy tasks: number discrimination, number memory, and number line.
  • Applied the standard two-choice diffusion model and the spatially continuous diffusion model.
  • Analyzed accuracy and response time distributions across three age groups (young adults, 60-69, 70-90).

Main Results:

  • Non-decision time (encoding/response) increased with age across tasks.
  • Boundary settings (evidence needed) increased in discrimination and memory tasks, but not on the number line task.
  • Drift rates (decision evidence accumulation) decreased in older adults for the number memory task, but not for easier tasks.

Conclusions:

  • Model-based analysis successfully resolved age-related discrepancies in performance.
  • Aging affects different components of cognitive tasks distinctly.
  • Consistent individual differences in decision-making processes were observed across tasks, highlighting the utility of diffusion models.