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Related Experiment Videos

Brain asymmetry and human electrodermal conditioning.

K Hugdahl1, B H Johnsen

  • 1Department of Somatic Psychology, University of Bergen, Norway.

Integrative Physiological and Behavioral Science : the Official Journal of the Pavlovian Society
|January 1, 1991
PubMed
Summary
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Brain laterality influences emotional conditioning. The right hemisphere showed stronger learning effects, particularly for angry facial expressions, suggesting differential brain regulation of emotional classical conditioning.

Area of Science:

  • Neuroscience
  • Psychology
  • Cognitive Science

Background:

  • Classical conditioning is a fundamental learning process.
  • Brain laterality, or hemispheric specialization, plays a role in cognitive functions.
  • Emotional stimuli can modulate learning and memory processes.

Purpose of the Study:

  • To investigate the role of brain laterality in human classical conditioning of emotional stimuli.
  • To determine if different brain hemispheres exhibit differential processing of emotional conditioned stimuli (CSs).

Main Methods:

  • Two experiments utilized classical conditioning paradigms with facial emotional expressions (angry, happy) as CSs and shock as the unconditioned stimulus (UCS).
  • Bilateral electrodermal responses were recorded.

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  • Lateralized presentation of CSs to either the left or right cerebral hemisphere during acquisition or extinction phases.

    • Main Results:

    • The right hemisphere demonstrated superior retention of conditioned responses, especially to angry facial expressions.
    • Lateralized presentation during acquisition showed that stimuli presented to the right hemisphere led to greater skin conductance responses (SCRs) during extinction.
    • Emotional conditioning appears to be differentially regulated by the brain's hemispheres.

    Conclusions:

    • The findings support the hypothesis that brain laterality differentially regulates emotional classical conditioning.
    • The right hemisphere shows a particular sensitivity to negative emotional stimuli, like angry faces, in conditioning paradigms.