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EEG differences in neurotic as compared with normal twin pairs

F Vogel, J Krüger, E Schalt

    Human Genetics
    |January 1, 1980
    PubMed
    Summary

    This study found that genetic factors influence electroencephalogram (EEG) patterns, even in individuals with neuroticism. Despite psychological differences, monozygotic twins showed similar EEG readings, suggesting a strong genetic basis for brain activity.

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    Area of Science:

    • Neuroscience
    • Psychiatry
    • Behavioral Genetics

    Background:

    • Neuroticism is a personality trait associated with emotional instability and negative affect.
    • Twin studies are crucial for disentangling genetic and environmental influences on psychological traits and biological markers.
    • Electroencephalography (EEG) measures electrical activity in the brain, offering insights into neural patterns.

    Purpose of the Study:

    • To investigate the relationship between neuroticism and electroencephalogram (EEG) patterns in twins.
    • To determine if genetic factors influencing EEG are altered by neuroticism.
    • To compare EEG concordance in monozygotic (MZ) and dizygotic (DZ) twins with varying neuroticism levels.

    Main Methods:

    • Resting electroencephalograms (EEGs) were recorded from 17 twin pairs (10 MZ, 7 DZ) identified through a neurotic co-twin.

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  • Twins' neuroticism scores were assessed using a standardized scale.
  • EEG data were analyzed using both visual inspection and computerized time-domain (interval-amplitude) analysis.

    • Main Results:

    • Visual EEG comparison revealed no consistent differences between monozygotic (MZ) co-twins, while dizygotic (DZ) pairs often showed discordance.
    • Computerized analysis did not find higher EEG discordance in neurotic MZ twins compared to non-neurotic MZ pairs.
    • No significant correlations were found between EEG differences and neuroticism score differences within MZ pairs.

    Conclusions:

    • The study concludes that individual, genetically determined EEG patterns are evident despite long-lasting psychological alterations associated with neuroticism.
    • Genetic influences on EEG appear robust and are not significantly masked by neuroticism.
    • This suggests that underlying neural predispositions, as reflected in EEG, are largely independent of neuroticism-related psychological changes.