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Related Experiment Videos

Can an analytic/holistic dichotomy explain hemispheric asymmetries?

S Bagnara, D B Boles, F Simion

    Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
    |April 1, 1982
    PubMed
    Summary

    Same responses to letter pairs are faster than different responses, suggesting distinct processing. Both hemispheres analyze and process visual information holistically and analytically.

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    N2pc reflects two modes for coding the number of visual targets.

    Psychophysiology·2018

    Area of Science:

    • Cognitive Psychology
    • Neuroscience
    • Human Visual Processing

    Background:

    • Reaction times (RTs) for 'same' judgments are typically faster than for 'different' judgments.
    • This difference suggests a dual-process model: a rapid holistic process for 'same' and a slower analytic process for 'different' stimuli.
    • Hemispheric specialization posits the right hemisphere (RH) as holistic and the left hemisphere (LH) as analytic.

    Purpose of the Study:

    • To investigate the processing of same-different letter pair judgments across visual fields.
    • To test the hypothesis that RH mediates holistic 'same' processing and LH mediates analytic 'different' processing.
    • To determine if visual field superiority exists for these distinct processing types.

    Main Methods:

    • Subjects performed same-different judgments on successively presented letter pairs.

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  • Stimuli were presented to either the left or right visual field.
  • The degree of difference between letter pairs was systematically varied for 'different' judgments.

    • Main Results:

    • 'Same' responses were consistently faster than 'different' responses.
    • For 'different' responses, RTs decreased as the degree of visual difference between letters increased.
    • No significant visual field superiority was observed for either 'same' or 'different' judgments.

    Conclusions:

    • The findings support the dual-process model, with 'same' pairs processed holistically and 'different' pairs analytically.
    • The absence of visual field superiority indicates that both the left and right hemispheres are capable of both holistic and analytic visual information processing.
    • This challenges strict hemispheric specialization for these specific cognitive tasks.