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Prosopagnosia, also known as face blindness, is the inability to recognize faces. In severe cases, individuals with prosopagnosia may not recognize close family members, including parents and spouses, by their faces. For instance, someone with prosopagnosia might walk past their child in a crowd, only realizing their mistake upon noticing their child's distinctive backpack or favorite jacket. Prosopagnosia specifically impairs facial recognition, while the recognition of other objects or...
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Appearance is a multidimensional aspect of self-presentation that encompasses observable attributes such as clothing, grooming, speech, and nonverbal behavior. These elements are often strategically managed to align with socially constructed expectations in different settings. For instance, individuals tailor their appearance during job interviews, social gatherings, or athletic events to meet the perceived norms of those environments.Contextual Adaptation and Social SignalsThe research...
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Related Experiment Video

Updated: Dec 31, 2025

Conscious and Non-conscious Representations of Emotional Faces in Asperger's Syndrome
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Conscious and Non-conscious Representations of Emotional Faces in Asperger's Syndrome

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Search for Face Identity or Expression: Set Size Effects in Developmental Prosopagnosia.

Sara Djouab1,2, Andrea Albonico1, Shanna C Yeung1

  • 1University of British Columbia.

Journal of Cognitive Neuroscience
|January 7, 2020
PubMed
Summary

Individuals with developmental prosopagnosia exhibit significant inefficiencies in searching for face identity, but not face expression. This visual search difference highlights a selective perceptual deficit in processing facial identity.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Vision Science

Background:

  • The set size effect in visual search measures processing load and perceptual efficiency.
  • Developmental prosopagnosia (DP) is a condition characterized by difficulties in recognizing familiar faces.

Purpose of the Study:

  • To investigate if individuals with DP show increased set size effects when searching for face identity compared to face expression.
  • To compare visual search efficiency for facial identity and expression in individuals with and without DP.

Main Methods:

  • Tested 29 healthy controls and 13 individuals with DP on visual search tasks.
  • Participants judged identity or expression sameness across arrays of 3–7 faces.
  • Set size effect calculated as the slope of response time versus array size.

Main Results:

  • DP participants showed significantly larger set size effects for face identity search than controls.
  • No significant difference in set size effects for face expression search between groups.
  • Single-participant analyses indicated impairments specific to identity search in most DP participants.
  • Signal detection analysis reliably distinguished DP from controls based on identity search set size effects.

Conclusions:

  • The face set size effect reveals a prevalent and selective perceptual inefficiency in processing face identity in developmental prosopagnosia.
  • Findings suggest distinct neural mechanisms for processing facial identity versus expression.
  • DP is characterized by specific deficits in the perceptual processing of facial identity information.