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General intelligence predicts memory change across sleep.

Kimberly M Fenn1, David Z Hambrick

  • 1Department of Psychology, Michigan State University, East Lansing, MI, 48824, USA, kfenn@msu.edu.

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Summary
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General intelligence (g) impacts how we consolidate memories during sleep. Higher intelligence is linked to better memory gain and less memory loss after sleep, suggesting intelligence supports offline memory processing.

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Area of Science:

  • Cognitive Neuroscience
  • Psychology

Background:

  • Psychometric intelligence (g) is typically viewed as online information processing capacity.
  • Emerging evidence suggests intelligence may also relate to offline information processing, particularly during sleep.

Purpose of the Study:

  • To investigate the relationship between psychometric general intelligence (g) and sleep-dependent memory consolidation.
  • To determine if g influences memory gain and loss across sleep versus wake periods.

Main Methods:

  • Participants studied paired-associate word lists.
  • Memory recall was tested after a 12-hour interval, either fully awake or including a sleep phase.
  • General intelligence (g) was assessed using a cognitive ability test battery.

Main Results:

  • In the wake condition, g showed no correlation with memory gain or loss.
  • In the sleep condition, g positively correlated with memory gain and negatively with memory loss.
  • Higher general intelligence was associated with greater memory gain and reduced memory loss across sleep.

Conclusions:

  • General intelligence (g) is not only associated with online cognitive processing but also with offline memory consolidation during sleep.
  • The relationship between g and memory loss is specific to sleep intervals, highlighting sleep's role in intelligence-related memory benefits.