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Hemispheric asymmetries in processing emotional expressions.

M Natale, R E Gur, R C Gur

    Neuropsychologia
    |January 1, 1983
    PubMed
    Summary
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    Facial emotion perception shows visual field differences. The left visual field (LVF) processes negative emotions more, while the right visual field (RVF) favors positive judgments, suggesting hemispheric specialization.

    Area of Science:

    • Neuroscience
    • Cognitive Psychology
    • Visual Perception

    Background:

    • Facial expressions are crucial for social interaction and emotional communication.
    • Previous research suggests hemispheric asymmetries in brain function, including emotional processing.

    Purpose of the Study:

    • To investigate visual field asymmetries in the perception and processing of facial emotional expressions.
    • To determine if different brain hemispheres exhibit biases in evaluating emotional valence.

    Main Methods:

    • Three experiments utilized unilateral facial stimuli (full faces, chimeric faces) presented to either the left visual field (LVF) or right visual field (RVF).
    • Participants judged emotional valence (positive/negative) or detected emotional expressions under controlled exposure durations.

    Related Experiment Videos

  • Handedness and writing posture were considered as potential influencing factors.

    • Main Results:

    • Expressions (except happiness) were perceived as more negative in the LVF for right-handers.
    • LVF presentations showed greater differential rating of emotional valence for happy, sad, and mixed stimuli.
    • Right visual field (RVF) presentations biased judgments toward positive emotional valence.

    Conclusions:

    • Evidence supports right hemispheric superiority in processing emotional valence of facial expressions.
    • The left hemisphere demonstrates a perceptual bias towards positive aspects of emotional stimuli.