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Inversion effects for faces and objects in developmental prosopagnosia: A case series analysis.

Solja K Klargaard1, Randi Starrfelt2, Christian Gerlach1

  • 1Department of Psychology, University of Southern Denmark, Denmark.

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Summary

Developmental prosopagnosia (DP) does not show a greater impairment for inverted faces compared to inverted cars, challenging theories of specialized face processing. DPs exhibit deficits in both upright and inverted face and car recognition.

Keywords:
Developmental prosopagnosiaFace inversion effectFace recognitionHolistic face processing

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Area of Science:

  • Cognitive Neuroscience
  • Neuropsychology
  • Visual Perception

Background:

  • The disproportionate face inversion effect (dFIE) suggests specialized neural operations for face recognition.
  • Developmental prosopagnosia (DP) may show altered inversion effects, with some studies suggesting superiority for inverted faces.

Purpose of the Study:

  • To investigate if the altered inversion effect in DP is specific to faces by comparing face and car inversion effects.
  • To directly compare inversion effects for faces and non-face objects (cars) in individuals with DP.

Main Methods:

  • A case series design was used, comparing 16 individuals with DP to a matched control group.
  • Inversion effects for faces and cars were assessed using identical recognition tasks.
  • Face processing without recognition was also evaluated in DPs.

Main Results:

  • Both groups showed inversion effects for faces and cars, but only controls exhibited a significant dFIE (larger effect for faces).
  • DPs were not significantly more affected by inversion than controls in a non-recognition face task.
  • DPs showed impairments in recognizing both upright and inverted faces and cars compared to controls.

Conclusions:

  • Results do not support face inversion superiority in DP.
  • The face recognition deficit in DP appears not to be limited to operations specialized for upright faces.
  • Altered face inversion effects in DP may not be specific to faces.