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Related Experiment Videos

Binocular rivalry and visual awareness in human extrastriate cortex

F Tong1, K Nakayama, J T Vaughan

  • 1Department of Psychology, Harvard University, Cambridge, Massachusetts 02138, USA. frank@wjh.harvard.edu

Neuron
|November 10, 1998
PubMed
Summary

Functional magnetic resonance imaging (fMRI) revealed that the human fusiform face area (FFA) and parahippocampal place area (PPA) respond to perceived stimuli during binocular rivalry, not just retinal input.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Visual Perception

Background:

  • The fusiform face area (FFA) and parahippocampal place area (PPA) are key regions for processing faces and places, respectively.
  • Binocular rivalry is a phenomenon where perception alternates between two different stimuli presented to each eye.

Purpose of the Study:

  • To investigate whether the FFA and PPA respond to the physically presented stimulus or the subjectively perceived stimulus during binocular rivalry.
  • To determine if neural competition in binocular rivalry is resolved at the level of the FFA and PPA.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to measure brain activity.
  • Participants viewed competing face and house stimuli presented to different eyes (binocular rivalry).

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  • Neural activity in the FFA and PPA was correlated with subjective reports of perception.

    • Main Results:

    • Activity in the FFA increased when faces were perceived and decreased when houses were perceived.
    • Activity in the PPA showed the opposite pattern, increasing for perceived houses and decreasing for perceived faces.
    • The magnitude of these activity changes matched those seen with non-rivalrous stimulus alternation.

    Conclusions:

    • FFA and PPA activity reflects the subjectively perceived stimulus, not the constant retinal input, during binocular rivalry.
    • Neural competition underlying binocular rivalry appears to be resolved at the level of the FFA and PPA.
    • These findings support the role of FFA and PPA in conscious visual perception.