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Face-sensitive brain responses in the first year of life
Stefania Conte1, John E Richards1, Maggie W Guy2
1Department of Psychology, University of South Carolina, United States.
Insights
Infant brain responses to faces show developmental changes in the first year. Specific brain regions, like the lingual and fusiform gyri, are involved in processing faces from 4.5 months old.
Area of Science:
- Developmental neuroscience
- Cognitive neuroscience
- Visual processing
Background:
- Infant face processing abilities develop significantly within the first year of life.
- Event-related potentials (ERPs) like the N290 show early face specificity.
- Limited knowledge exists on the developmental trajectory and cortical localization of infant face processing neural responses.
Purpose of the Study:
- To investigate age-related changes in ERP responses to faces versus objects in infants.
- To determine the cortical localization of face-processing ERP components in infants.
- To explore the developmental course of neural precursors for face recognition.
Main Methods:
- Cross-sectional study of ERPs in infants aged 4.5 to 12 months.
- Presentation of faces and objects to elicit neural responses.
- Application of cortical source localization techniques to identify brain regions.
Main Results:
- Enhanced P1 and N290 ERP amplitudes for faces compared to objects were observed.
- P1 and N290 components were localized to the lingual and fusiform gyri, respectively.
- The Nc component's amplitude varied with stimulus type and attentional state, localizing to medial-anterior brain areas.
Conclusions:
- The study identifies specific ERP components (P1, N290) and their cortical origins in early face processing.
- Findings reveal developmental changes in neural responses underlying face recognition in infancy.
- Results contribute to understanding the neural basis of face processing development.
Abstract:
Cortical areas in the ventral visual pathway become selectively tuned towards the processing of faces compared to non-face stimuli beginning around 3 months of age and continuing over the first year. Studies using event-related potentials in the EEG (ERPs) have found an ERP component, the N290, that displays specificity for human faces. Other components, such as the P1, P400, and Nc have been studied to a lesser degree in their responsiveness to human faces. However, little is known about the systematic changes in the neural responses to faces during the first year of life, and the localization of these responses in infants' brain. We examined ERP responses to pictures of faces and objects in infants from 4.5 months through 12 months in a cross-sectional study. We investigated the activity of all the components reported to be involved in infant face processing, with particular interest to their amplitude variation and cortical localization. We identified neural regions responsible for the component through the application of cortical source localization methods. We found larger P1 and N290 responses to faces than objects, and these components were localized in the lingual and middle/posterior fusiform gyri, respectively. The amplitude of the P400 was not differentially sensitive to faces over objects. The Nc component was different for faces and objects, was influenced by the infant's attentional state, and localized in medial-anterior brain areas. The implications of these results are discussed in the identification of developmental ERP precursors to face processing.
