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Related Concept Videos

Prosopagnosia01:24

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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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Charles Darwin proposed that facial expressions are an evolutionary adaptation for communication. He argued that these expressions are not influenced by culture but are universal across species. For example, a snarling expression with exposed teeth signals a threat in many animals, including humans. Darwin also suggested that displaying an emotion can intensify the feeling. Smiling, for example, could enhance one's sense of happiness. This idea laid the foundation for understanding the role...
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Related Experiment Video

Updated: Feb 23, 2026

Holistic Facial Composite Creation and Subsequent Video Line-up Eyewitness Identification Paradigm
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Normal composite face effects in developmental prosopagnosia.

Federica Biotti1, Esther Wu2, Hua Yang3

  • 1Department of Psychology, City, University of London, UK.

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
|August 30, 2017
PubMed
Summary
This summary is machine-generated.

Individuals with developmental prosopagnosia show normal susceptibility to the composite face effect, challenging theories linking this to holistic face processing deficits. Face recognition ability is not solely dependent on this specific whole-face binding process.

Keywords:
Composite face effectDevelopmental prosopagnosiaHolistic face processing

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Area of Science:

  • Cognitive psychology
  • Neuroscience
  • Visual perception

Background:

  • Upright face perception relies on holistic processing, integrating local features into a unified whole.
  • The composite face effect demonstrates this holistic processing by merging aligned face halves.
  • Previous research suggested developmental prosopagnosia might involve reduced holistic processing, indicated by lower composite effect susceptibility.

Purpose of the Study:

  • To investigate whether developmental prosopagnosia is associated with reduced composite face effects.
  • To examine the relationship between face recognition ability and susceptibility to the composite face effect.

Main Methods:

  • Two independent studies were conducted using different composite face effect procedures.
  • Participants included individuals with developmental prosopagnosia and controls with normal face recognition.
  • Composite face effects were measured for upright and inverted face stimuli.

Main Results:

  • Both developmental prosopagnosia groups and control groups exhibited significant composite face effects.
  • The magnitude of the composite face effect was similar between prosopagnosic and control participants.
  • Composite effects were substantially reduced when face stimuli were inverted, regardless of participant group.

Conclusions:

  • The composite face effect, indexing whole-face binding, is intact in developmental prosopagnosia.
  • Reduced composite face effects are not the cause of developmental prosopagnosia.
  • Face recognition ability likely depends on multiple processes beyond holistic face integration.