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Prosopagnosia01:24

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Analyzing Neural Activity and Connectivity Using Intracranial EEG Data with SPM Software
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Acquired prosopagnosia abolishes the face inversion effect.

Thomas Busigny1, Bruno Rossion

  • 1Universite Catholique de Louvain, Faculté de Psychologie et des Sciences de l'Education, Louvain-la-Neuve, Belgium. thomas.busigny@uclouvain.be

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
|August 18, 2009
PubMed
Summary

Individuals with acquired prosopagnosia (AP) often lack the face inversion effect (FIE), impacting their ability to recognize upside-down faces. This study confirms a significantly reduced or absent FIE in AP, suggesting a disruption in holistic face representation.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Visual Perception

Background:

  • Recognizing individual faces is impaired when inverted.
  • Acquired prosopagnosia (AP) is linked to impaired expert face processing.
  • Previous studies show inconsistent findings regarding the face inversion effect (FIE) in AP.

Purpose of the Study:

  • To investigate face and non-face object processing in a patient with acquired prosopagnosia (AP).
  • To determine the impact of face inversion on recognition in AP.
  • To clarify the pattern of the face inversion effect (FIE) in prosopagnosia.

Main Methods:

  • Conducted five experiments on a patient (PS) with face-selective AP.
  • Assessed performance on upright and inverted face discrimination tasks.
  • Included experiments on familiar faces and non-face object (car) discrimination.

Main Results:

  • The patient (PS) showed no face inversion effect (FIE) for individual faces.
  • A small inversion cost was observed for non-face objects (cars), similar to controls.
  • Familiar face recognition also lacked an inversion effect in the patient.

Conclusions:

  • The face inversion effect (FIE) is generally absent or reduced in acquired prosopagnosia (AP).
  • This supports the hypothesis that AP involves a disruption of holistic face representation.
  • Paradoxical superior performance with inverted faces may relate to other visual field defects.