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Related Experiment Videos

Developmental functions for speeds of cognitive processes.

R Kail1

  • 1Department of Psychological Sciences, Purdue University, West Lafayette, IN 47907.

Journal of Experimental Child Psychology
|June 1, 1988
PubMed
Summary

Cognitive development in children and adolescents shows significant improvements in visual and memory search speeds, alongside other cognitive tasks. These developmental changes in processing speed are consistent across various tasks and suggest a central limiting mechanism.

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Area of Science:

  • Cognitive Psychology
  • Developmental Psychology
  • Neuroscience

Background:

  • Human cognitive abilities undergo significant development throughout childhood and adolescence.
  • Understanding the developmental trajectory of cognitive processing speed is crucial for identifying underlying mechanisms.

Purpose of the Study:

  • To investigate the developmental changes in cognitive processing speed across various tasks in individuals aged 8 to 22.
  • To determine if developmental changes in different cognitive tasks follow similar patterns and rates.

Main Methods:

  • Experiment 1: Visual search and memory search tasks administered to 8- to 21-year-olds.
  • Experiment 2: Memory search, mental rotation, analogical reasoning, and mental addition tasks administered to 8- to 22-year-olds.

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  • Data analysis involved fitting exponential functions to describe age-related changes in task performance.

    • Main Results:

    • Processing speeds for visual search and memory search tasks increased with age, well-described by exponential functions.
    • Three out of four tasks in Experiment 2 also showed developmental changes best modeled by exponential functions with a similar rate.
    • The rate of developmental change was comparable across the different cognitive tasks studied.

    Conclusions:

    • A central mechanism, likely related to processing speed limitations, underlies cognitive development.
    • This central mechanism undergoes age-related changes that influence performance across a range of cognitive tasks.
    • The findings suggest a unified model for cognitive development driven by a common rate-limiting factor.