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Developmental prosopagnosics have widespread selectivity reductions across category-selective visual cortex.

Guo Jiahui1, Hua Yang2, Bradley Duchaine2

  • 1Department of Psychological and Brain Sciences, Dartmouth College, Hanover, NH 03755 jiahui.guo.gr@dartmouth.edu.

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|June 27, 2018
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Summary

Developmental prosopagnosia (DP) involves impaired facial recognition. This study found widespread deficits across the face network in individuals with DP, challenging previous theories and indicating broader visual processing issues.

Keywords:
developmental disorderface perceptionprosopagnosiascene perceptionvisual recognition

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Visual Perception

Background:

  • Developmental prosopagnosia (DP) is a neurodevelopmental disorder impacting facial identity recognition.
  • The specific cortical areas involved and the function of other category-selective areas in DP remain unclear.

Purpose of the Study:

  • To investigate the neural basis of face processing deficits in DP.
  • To examine the function of category-selective areas beyond face processing in DP.

Main Methods:

  • Utilized fMRI with a dynamic localizer task presenting faces, scenes, bodies, objects, and scrambled objects.
  • Analyzed category selectivity in 22 individuals with DP and 27 controls.

Main Results:

  • Individuals with DP showed reduced face selectivity across all tested face areas, with significant reductions in both posterior and anterior regions.
  • Face processing in other category-selective areas was comparable between DPs and controls.
  • DPs exhibited reduced scene selectivity and marginal reductions in body selectivity in their respective category-selective areas.

Conclusions:

  • DP involves widespread deficits within the face processing network, contradicting theories suggesting normal posterior face areas.
  • Reduced selectivity in other category-selective areas suggests broader high-level visual cortex dysfunction in many individuals with DP.