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  3. The Relationship Between Intelligence, Working Memory Capacity, And Information Processing Speed During Encoding.
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  3. The Relationship Between Intelligence, Working Memory Capacity, And Information Processing Speed During Encoding.

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Assessing Working Memory in Children: The Comprehensive Assessment Battery for Children – Working Memory (CABC-WM)
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The relationship between intelligence, working memory capacity, and information processing speed during encoding.

Kathrin Sadus1, Anna-Lena Schubert2, Sven Lesche1

  • 1Institute of Psychology, Heidelberg University.

Journal of Experimental Psychology. General
|January 12, 2026

View abstract on PubMed

Summary
This summary is machine-generated.

The link between mental speed and intelligence is not fully understood. This study found that information processing speed during working memory encoding does not significantly correlate with intelligence or working memory capacity.

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Area of Science:

  • Cognitive Neuroscience
  • Psychology
  • Intelligence Research

Background:

  • The mental speed hypothesis suggests intelligence differences stem from information processing speed variations.
  • Reaction time studies show weak correlations, but event-related potential (ERP) component latencies reveal stronger links (-.49 to -.89).
  • Previous research focused on decision-related processes, leaving the role of non-decisional working memory (WM) speed unclear.

Purpose of the Study:

  • To investigate if information processing speed during working memory (WM) encoding generalizes to intelligence.
  • To examine the relationship between WM encoding speed, WM capacity, and general intelligence.
  • To extend prior findings by incorporating WM capacity into the mental speed-intelligence framework.

Main Methods:

  • Collected electroencephalographic (EEG) data, WM capacity, and intelligence measures from 141 participants.
  • Analyzed latent correlations using a latent state-trait model to control for measurement error and situational variance.
  • Focused on the latencies of late ERP components as a measure of WM encoding speed.

Main Results:

  • Information processing speed during WM encoding showed no significant relationship with intelligence.
  • WM encoding speed was also not significantly related to WM capacity.
  • Latent correlations between WM encoding speed and intelligence/WM capacity were non-significant.

Conclusions:

  • The relationship between mental speed and intelligence may not extend to the speed of working memory encoding.
  • Findings suggest that the mental speed-intelligence link might be specific to certain cognitive processes, possibly decision-making.
  • Further research is needed to identify the factors influencing the mental speed-intelligence relationship, particularly concerning working memory.