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Visualizing Visual Adaptation
04:43

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Published on: April 24, 2017

High-level face shape adaptation depends on visual awareness: evidence from continuous flash suppression.

Timo Stein1, Philipp Sterzer

  • 1Department of Psychiatry, Charité Campus Mitte, Berlin, Germany. timo.stein@bccn-berlin.de

Journal of Vision
|July 12, 2011
PubMed
Summary

Even invisible faces can influence perception through low-level adaptation, but high-level face processing requires visual awareness. This study explores visual processing during interocular suppression.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Visual Perception

Background:

  • Interocular suppression renders one image invisible when incompatible images are presented to the two eyes.
  • The extent to which complex visual information is processed during suppression, particularly in the ventral visual pathway, remains unclear.

Purpose of the Study:

  • To investigate whether basic face shape can be processed without visual awareness.
  • To determine if high-level visual processing in the ventral stream occurs during interocular suppression.

Main Methods:

  • Utilized continuous flash suppression to induce interocular suppression.
  • Measured aftereffects from prolonged exposure to distorted faces, some of which were fully suppressed from awareness.
  • Varied stimulus presentation (same/different eyes, same/different sizes) to assess adaptation effects.

Main Results:

  • Aftereffects were induced by entirely invisible faces, indicating some processing without awareness.
  • These effects were reduced for invisible adaptors compared to partially visible ones.
  • High-level processing, requiring ventral stream involvement, was eliminated by suppression and necessitated awareness.

Conclusions:

  • A monocular, low-level component of face shape adaptation can occur without visual awareness.
  • High-level face shape encoding, dependent on ventral stream processing, is abolished by interocular suppression and requires conscious perception.