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Related Experiment Video

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Ex utero Electroporation and Whole Hemisphere Explants: A Simple Experimental Method for Studies of Early Cortical Development
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Hemispheric Organization in Disorders of Development.

Elliot Collins1,2, Eva Dundas1, Yafit Gabay1,3

  • 1Department of Psychology, Carnegie Mellon University and Center for the Neural Basis of Cognition, 5000 Forbes Avenue, Pittsburgh, PA 15213-3890.

Visual Cognition
|November 23, 2018
PubMed
Summary

Developmental dyslexia (DD) and congenital prosopagnosia (CP) impact word and face processing. Findings suggest typical word processing can develop without typical face processing, but not vice versa, supporting interactive perceptual development.

Keywords:
N170developmental dyslexiaface recognitionhemispheric organizationprosopagnosiaword recognition

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Developmental Psychology

Background:

  • Childhood word recognition acquisition involves left hemisphere (LH) visual-language coupling.
  • This coupling may compete with LH face representation, leading to right hemisphere (RH) face lateralization.
  • This hypothesis suggests an interaction between word and face processing development.

Purpose of the Study:

  • To test the hypothesis of interactive perceptual development using behavioral and ERP data.
  • To investigate hemispheric lateralization for words and faces in individuals with developmental dyslexia (DD) and congenital prosopagnosia (CP).

Main Methods:

  • Utilized a hemifield behavioral paradigm with words and faces as stimuli.
  • Employed concurrent electroencephalography (ERP) measurement.
  • Studied adults with DD, adults with CP, and matched control participants.

Main Results:

  • DD group showed deficits in both word and face processing behaviorally and in ERPs.
  • CP group exhibited specific face processing deficits, with typical word processing.
  • DD group lacked typical RH dominance for faces and LH dominance for words; CP group showed typical LH word dominance but not RH face dominance.

Conclusions:

  • Typical hemispheric organization for words can develop independently of typical face processing lateralization.
  • Typical hemispheric organization for faces requires typical word processing lateralization.
  • Findings support an interactive model of perceptual development where word and face processing systems influence each other's lateralization.