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Related Experiment Videos

Faces are represented holistically in the human occipito-temporal cortex.

Christine Schiltz1, Bruno Rossion

  • 1Laboratoire de Neurophysiologie, Université catholique de Louvain, Avenue Hippocrate 54-49, 1200 Brussels, Belgium. schiltz@nefy.ucl.ac.be

Neuroimage
|July 28, 2006
PubMed
Summary

The face composite effect shows that identical face parts look different based on their context. Brain imaging reveals that visual cortex areas process faces holistically, integrating features into whole representations.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Visual Perception

Background:

  • The face composite effect demonstrates that perception of a face part is influenced by its surrounding features.
  • This suggests that faces are processed as unified wholes, not isolated components.

Purpose of the Study:

  • To investigate whether brain regions selective for faces process them holistically.
  • To test the hypothesis using functional magnetic resonance imaging (fMRI) and the face composite illusion.

Main Methods:

  • fMRI was used to measure brain activity in participants viewing face stimuli.
  • An adaptation paradigm with the face composite illusion was employed.
  • Stimuli included aligned and misaligned face parts, as well as upright and inverted faces.

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Main Results:

  • A significantly larger neural response was observed in the middle fusiform gyrus (MFG) and inferior occipital gyrus (IOG) when the same top face part was paired with different bottom parts compared to the same bottom part.
  • This holistic processing effect was most pronounced in the right MFG.
  • The effect diminished with spatial misalignment and inversion of faces.

Conclusions:

  • Facial features are integrated into holistic representations within face-selective areas of the human visual cortex.
  • These findings support the notion of whole-based face processing in the brain.
  • The MFG and IOG play a crucial role in this integrated facial representation.