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Chronic alcohol use negatively impacts working memory. Using a cotwin control design, researchers found that higher alcohol consumption in twins was linked to poorer performance on working memory tasks, even within genetically similar pairs.

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Area of Science:

  • Neuroscience
  • Psychology
  • Behavioral Science

Background:

  • Chronic alcohol consumption is a widespread issue with known health consequences.
  • Previous research suggests a link between alcohol use and cognitive deficits, but causal relationships are difficult to establish due to confounding factors.

Purpose of the Study:

  • To rigorously test the causal hypothesis that chronic alcohol use impairs working memory performance.
  • To differentiate the effects of alcohol consumption from familial influences on working memory.

Main Methods:

  • Employed a cotwin control design with 158 dizygotic and 278 monozygotic twins.
  • Measured alcohol consumption and working memory accuracy across four tasks (NIH Toolbox List Sorting, NIH Toolbox Picture Sequence, Penn Word Memory, 2-back).
  • Analyzed linear associations between alcohol consumption and working memory before and after controlling for familial confounding.

Main Results:

  • Initial analyses showed no significant association between alcohol use and working memory across the entire sample.
  • Cotwin analyses revealed that twins with higher alcohol consumption performed significantly worse on a latent working memory composite, Picture Sequence, and List Sorting tasks compared to their cotwins.
  • These findings suggest a specific effect of alcohol consumption on working memory after accounting for shared genetic and environmental factors.

Conclusions:

  • The results support a potentially causal relationship between alcohol use and impaired working memory performance.
  • Familial factors can confound the observed relationship, highlighting the importance of designs that control for such influences.
  • Further research is needed to elucidate the mechanisms underlying alcohol's negative impact on cognition and identify factors influencing both alcohol behaviors and cognitive function.