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Human genetics provides a profound framework for understanding the interplay between genetic predispositions and human psychology. At the heart of this discipline lies the study of how genes influence physical traits, behaviors, and susceptibility to diseases. Each person carries a unique genetic code that subtly or significantly shapes their psychological and behavioral landscape.
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Intelligence is often thought to be linked to brain size, but the relationship is more complex than that. While brain size does correlate modestly with some abilities, like verbal skills, the connection is weaker for others, such as spatial reasoning. Other factors, like brain structure, also play crucial roles. For instance, despite Einstein's smaller-than-average brain, his parietal cortex, which is involved in spatial reasoning, was 15% wider, suggesting that neural density might matter...
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Heritability is a statistical concept that measures the degree to which genetic differences among individuals contribute to trait variations within a population. It is a fundamental idea in genetics, often prone to misinterpretation. Heritability is expressed as a percentage, reflecting the proportion of variation in a specific trait across a population that can be linked to genetic differences. However, it's important to understand that heritability does not determine how "genetic"...
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Genetic insights into the causal relationship between physical activity and cognitive functioning.

Boris Cheval1,2, Liza Darrous3,4, Karmel W Choi5

  • 1Swiss Center for Affective Sciences, University of Geneva, Geneva, Switzerland. boris.cheval@unige.ch.

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Engaging in moderate and vigorous physical activity (MVPA) causally enhances cognitive functioning. This study found no evidence that cognitive function influences physical activity levels, highlighting MVPA

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Area of Science:

  • Neuroscience
  • Genetics
  • Public Health

Background:

  • Physical activity and cognitive function are linked, but causal pathways are unclear.
  • Cognition may influence physical activity, and vice versa.
  • Understanding this bidirectional relationship is crucial for health interventions.

Purpose of the Study:

  • To investigate the causal relationship between physical activity and cognitive functioning.
  • To assess if physical activity influences cognition or if cognition influences physical activity.

Main Methods:

  • Latent Heritable Confounder Mendelian Randomization (LHC-MR) was employed.
  • Data from UK Biobank and COGENT genome-wide association studies were used.
  • Accelerometer-measured physical activity and cognitive functioning data were analyzed.

Main Results:

  • Increased moderate physical activity showed a causal link to enhanced cognitive functioning.
  • Increased vigorous physical activity also causally improved cognitive functioning.
  • No evidence found for cognitive functioning causally affecting physical activity.

Conclusions:

  • Moderate and vigorous physical activity (MVPA) have a beneficial causal effect on cognitive functioning.
  • The findings support promoting MVPA for cognitive health.
  • Bidirectional causal links were not supported by the data.