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Interhemispheric switching mediates perceptual rivalry.

S M Miller1, G B Liu, T T Ngo

  • 1Vision, Touch and Hearing Research Centre, Department of Physiology and Pharmacology, The University of Queensland, Brisbane, 4072, Australia. s.miller@vthrc.uq.edu.au

Current Biology : CB
|February 7, 2001
PubMed
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Perceptual rivalry, like binocular rivalry, is mediated by interhemispheric switching between brain hemispheres, not within them. This finding impacts understanding consciousness and bipolar disorder.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Perception

Background:

  • Binocular rivalry involves alternating perceptions when images from both eyes conflict.
  • Previous research suggested rivalry might occur early in the visual pathway.
  • Studies in monkeys indicated neural activity higher in the visual pathway correlates with reported perception.

Purpose of the Study:

  • To investigate whether unilateral brain hemisphere activation or disruption influences binocular rivalry.
  • To explore the role of interhemispheric communication in perceptual alternations.

Main Methods:

  • Unilateral caloric vestibular stimulation in human subjects.
  • Transcranial magnetic stimulation (TMS) timed to specific phases of perceptual switches.
  • Assessment of effects on binocular rivalry and Necker cube perception.

Related Experiment Videos

Main Results:

  • Unilateral caloric vestibular stimulation altered the time spent in each competing perceptual state.
  • TMS disrupted perceptual alternations when applied at specific switch phases.
  • Hemispheric activation by caloric stimulation also affected Necker cube alternations.

Conclusions:

  • Interhemispheric switching, rather than within-hemisphere processes, mediates perceptual rivalry.
  • Competition for awareness in binocular rivalry and reversible figures occurs between hemispheres.
  • This interhemispheric switch hypothesis has implications for consciousness and bipolar disorder.