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Decoding dynamic faces and scenes without awareness under dis-continuous flash suppression.

Yen-Ju Feng1, Shao-Min Hung2,3, Po-Jang Hsieh4

  • 1Department of Psychology, National Taiwan University, Taipei, Taiwan, ROC. yenju0115@gmail.com.

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Even when faces are invisible to conscious awareness, the brain processes them deeply. Advanced methods reveal unconscious face recognition in the occipital-temporal region, specifically the fusiform face area (FFA) and occipital face area (OFA).

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Area of Science:

  • Perceptual sciences
  • Cognitive neuroscience
  • Neuroimaging

Background:

  • The extent of unconscious processing remains a key debate in perceptual sciences.
  • Understanding neural correlates of unconscious perception is crucial for cognitive theories.

Purpose of the Study:

  • To investigate the neural basis of unconscious face processing.
  • To refine experimental paradigms for detecting subtle unconscious signals.
  • To explore the depth of visual processing for invisible stimuli.

Main Methods:

  • Utilized improved paradigms, stimuli, and analyses for exploring unconscious face processing.
  • Employed univariate and multivariate analyses, including whole-brain classification and Region of Interest (ROI) analysis.
  • Used interocular suppression to render faces invisible to conscious awareness (n=43).

Main Results:

  • Conscious faces showed broader univariate activation than conscious scenes.
  • Univariate results were absent for invisible faces/scenes.
  • Multivariate classification successfully distinguished invisible faces from scenes in the occipital-temporal region.
  • Bilateral FFA and OFA differentiated dynamic invisible faces from scenes.

Conclusions:

  • Invisible faces undergo in-depth processing within the ventral visual stream.
  • Optimizing experimental design and analysis is vital for revealing unconscious neural signals.
  • The findings contribute to understanding the boundaries of conscious perception.