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Related Experiment Videos

Brain size and intelligence in man.

R E Passingham

    Brain, Behavior and Evolution
    |January 1, 1979
    PubMed
    Summary

    This study explored brain size and intelligence, finding a weak link between cranial capacity and IQ, influenced by height. A slight correlation also emerged between brain size and occupation after controlling for body size.

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    Area of Science:

    • Neuroscience
    • Anthropology
    • Psychology

    Background:

    • The link between brain size and cognitive abilities is a long-standing area of scientific inquiry.
    • Previous research has yielded mixed results regarding the correlation between brain volume and intelligence.

    Purpose of the Study:

    • To investigate the relationship between brain size and intelligence in humans.
    • To examine potential confounding factors, such as body size, in this relationship.

    Main Methods:

    • Measured cranial capacity in individuals with known IQ scores.
    • Analyzed brain size data from a large series of brains, correlating it with occupational group.
    • Employed statistical methods to control for confounding variables like height and weight.

    Main Results:

    • A minimal correlation was observed between cranial capacity and IQ, which was attributed to the confounding effect of height.
    • After controlling for body height and weight, a statistically significant, though very slight, association between brain size and occupational group was identified.

    Conclusions:

    • Body size, particularly height, significantly influences the apparent relationship between cranial capacity and intelligence.
    • A subtle but statistically significant correlation exists between brain size and occupational status when confounding factors are accounted for.

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