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Illusory brightness under unconscious processing: Evidence from continuous flash suppression.

Hirotaka Senda1, Michael Makoto Martinsen1, Hideki Tamura1

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Consciousness and Cognition
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Summary
This summary is machine-generated.

Illusory brightness, like the glare illusion, can be processed unconsciously. However, it does not always speed up conscious awareness unless specific contextual cues are present.

Keywords:
Brightness PerceptionContinuous Flash SuppressionIllusion

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Area of Science:

  • Visual perception
  • Cognitive neuroscience
  • Psychophysics

Background:

  • Brightness perception is influenced by contextual cues, leading to discrepancies with physical luminance.
  • The role of unconscious processing and awareness in illusory brightness perception remains largely unexplored.

Purpose of the Study:

  • To investigate whether illusory brightness, specifically the glare illusion, is processed unconsciously.
  • To determine if illusory brightness accelerates entry into conscious awareness.
  • To examine the influence of contextual cues on the awareness of illusory brightness.

Main Methods:

  • Continuous flash suppression (CFS) was employed to control visual awareness.
  • Breakthrough time (BT) was measured to assess the speed of conscious access.
  • Experiments involved manipulating the visibility of the glare illusion's inducer gradients and central luminance.

Main Results:

  • Subjective brightness alone did not reliably hasten conscious awareness (Experiment 1).
  • Suppression of inducer gradients facilitated detection, shortening breakthrough times (Experiment 2).
  • Participants could discriminate illusory brightness unconsciously above chance levels (Experiment 3).

Conclusions:

  • Illusory brightness can be encoded unconsciously, dissociating it from conscious awareness.
  • Contextual structure, not just subjective brightness, is crucial for accelerating conscious awareness.
  • Visual system's processing of contextual cues influences the emergence of illusory brightness into consciousness.