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EEG correlates of hemisphere differences during a rapid calculation task

R Shepherd, A Gale

    British Journal of Psychology (London, England : 1953)
    |February 1, 1982
    PubMed
    Summary
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    Cortical arousal, measured by electroencephalography (EEG), increased with task difficulty in male subjects. Left hemisphere EEG activity specifically correlated with reaction time, suggesting its role in mental effort and calculation.

    Area of Science:

    • Neuroscience
    • Cognitive Psychology
    • Human Electrophysiology

    Background:

    • Previous research on hemispheric differences in cognitive tasks has faced methodological challenges.
    • Understanding the neural correlates of mental effort and calculation is crucial for cognitive science.

    Purpose of the Study:

    • To investigate the relationship between electroencephalography (EEG) parameters and cognitive load during a numerical task.
    • To explore potential differences in brain activity between the left and right hemispheres during mental effort and calculation.

    Main Methods:

    • Twenty male participants performed a continuous task requiring responses to digit sets.
    • EEG data was recorded to measure cortical arousal and hemispheric activity.
    • Task involved identifying odd number sets with sums greater than or equal to 20.

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    Main Results:

    • EEG abundance in both hemispheres was inversely related to the number of odd digits, indicating increased cortical arousal.
    • This arousal effect was more pronounced in the left hemisphere across certain frequency bands.
    • Reaction time showed a significant correlation with left hemisphere EEG parameters only.

    Conclusions:

    • Hemispheric differences in EEG activity reflect both general mental effort and specific rapid calculation processes.
    • The findings suggest a specialized role for the left hemisphere in tasks involving numerical computation.
    • This study provides robust evidence, overcoming limitations of prior research in cognitive neuroscience.