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Published on: October 30, 2018
Sensitive periods for the functional specialization of the neural system for human face processing
Brigitte Röder1, Pia Ley, Bhamy H Shenoy
1Division of Biological Psychology and Neuropsychology, University of Hamburg, 20146 Hamburg, Germany.
Summary
Early visual experience shapes the brain's face processing. Congenital cataracts impair the development of the face-sensitive N170 response, highlighting a critical period for neural specialization.
Area of Science:
- Neuroscience
- Developmental Neuroscience
- Visual Perception
Background:
- The brain's ability to process complex visual information, such as human faces, develops over time.
- Early visual input is crucial for the functional specialization of neural systems.
- The N170 event-related potential is a known neural marker for face processing.
Purpose of the Study:
- To investigate sensitive periods in the development of human face processing.
- To examine the impact of early-onset visual deprivation on face-sensitive neural responses.
- To determine if visual experience is necessary for the emergence of specialized face processing.
Main Methods:
- Recorded event-related potentials (ERPs) in individuals blind from birth who had cataract surgery at varying ages (2 months to 14 years).
- Presented images of faces, houses, scrambled versions, and target butterflies.
- Analyzed the N170 component of the ERPs in response to different visual stimuli.
Main Results:
- Participants with a history of developmental or incomplete congenital cataracts showed a typical face-sensitive N170 response.
- Individuals with a history of congenital dense cataracts lacked the face-sensitive N170 response.
- This group exhibited similar N170 responses to all visual stimuli, not specifically faces.
Conclusions:
- The development of specialized neural representations for face processing is experience-dependent.
- A sensitive period exists for establishing the functional differentiation required for proficient face recognition.
- Early visual experience, particularly during critical developmental windows, is essential for neural specialization in face perception.
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