Alcohol consumption's effects on working memory: Examining familial confounding

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.