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Related Experiment Videos

What bilateral displays do.

D B Boles1

  • 1Department of Psychology, Rensselaer Polytechnic Institute, Troy, NY 12180.

Brain and Cognition
|March 1, 1990
PubMed
Summary

Bilateral stimulation creates larger asymmetries than unilateral stimulation, across senses. This study supports the homolog activation hypothesis, suggesting similar bilateral stimuli disrupt communication between homologous brain areas.

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Area of Science:

  • Cognitive Neuroscience
  • Visual Perception
  • Hemispheric Interaction

Background:

  • Bilateral stimulus presentation causes larger asymmetries than unilateral presentation across sensory modalities.
  • Previous research has eliminated non-interaction hypotheses and some hemispheric interaction mechanisms for this effect.

Purpose of the Study:

  • To test the remaining hypotheses explaining the bilateral advantage in perception.
  • To identify the specific mechanism underlying enhanced asymmetries with bilateral stimuli.

Main Methods:

  • Four experiments were conducted to investigate visual field differences.
  • Hypotheses regarding hemispheric interaction were systematically tested.

Main Results:

  • The results provide strong support for the homolog activation hypothesis.
  • This hypothesis posits that bilateral stimulation of similar stimuli activates homologous brain regions, interfering with inter-hemispheric communication.

Conclusions:

  • The homolog activation hypothesis is the most plausible explanation for the observed bilateral advantage.
  • Disruption of communication between homologous areas is key to understanding this perceptual asymmetry.

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