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Cortical Source Analysis of High-Density EEG Recordings in Children
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The Cortical Development of Specialized Face Processing in Infancy.

Maggie W Guy1, Nicole Zieber2, John E Richards2

  • 1University of South Carolina. guymw@mailbox.sc.edu.

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Infant brains show distinct electrical activity (ERPs) when processing faces versus toys. Specialized face processing in infants involves specific brain regions, including the middle fusiform gyrus.

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Area of Science:

  • Neuroscience
  • Developmental Psychology
  • Cognitive Science

Background:

  • Early face processing is crucial for social development.
  • Understanding infant brain activity provides insights into cognitive development.

Purpose of the Study:

  • To investigate specialized face processing in infants using event-related potentials (ERPs).
  • To identify the brain's cortical sources for face and object recognition in early development.

Main Methods:

  • Recorded ERPs in 48 infants (4.5-7.5 months old) exposed to faces and toys.
  • Utilized realistic, age-appropriate head models for cortical source analysis.
  • Analyzed ERP components (N290, P400, Nc) during attention and inattention.

Main Results:

  • ERP components (N290, P400, Nc) showed higher amplitude during attention.
  • Face processing elicited a greater N290 amplitude than toys during attention.
  • Toy processing showed a greater P400 amplitude than faces during attention.
  • N290 activity originated in occipital-temporal areas, notably the middle fusiform gyrus.
  • Nc and P400 activity involved frontal, parietal, and temporal brain regions.

Conclusions:

  • Infants exhibit distinct neural responses to faces compared to objects.
  • The middle fusiform gyrus is an early neural substrate for face processing in infants.
  • Attention significantly modulates early visual processing in the infant brain.