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Expert face processing requires visual input to the right hemisphere during infancy
Richard Le Grand1, Catherine J Mondloch, Daphne Maurer
1Department of Psychology, McMaster University, 1280 Main Street West, Hamilton, Ontario L8S 4K1, Canada.
Nature Neuroscience
|September 6, 2003
Summary
Early visual experience is crucial for developing expert face processing abilities, particularly in the right hemisphere. The right hemisphere requires this early input to achieve face processing expertise.
Area of Science:
- Neuroscience
- Developmental Neuroscience
- Visual Perception
Background:
- Adult face processing relies heavily on right-hemisphere neural networks.
- The role of early visual input in establishing this hemispheric specialization is not fully understood.
Purpose of the Study:
- To investigate the contribution of early visual experience to the development of expert face processing.
- To determine if hemispheric specialization for face processing is innate or experience-dependent.
Main Methods:
- Comparison of visually normal individuals with patients experiencing early visual input restriction to one hemisphere.
- Assessment of face processing expertise in relation to the pattern of visual deprivation during infancy.
Main Results:
- Severe impairment in expert face processing observed in individuals with early right-hemisphere visual deprivation.
- No significant impairment in face processing for individuals with early left-hemisphere visual deprivation.
- Evidence suggests face processing circuitry is not pre-specified but requires early visual input.
Conclusions:
- Early visual experience is essential for developing the neural substrate of adult face expertise.
- The right hemisphere is uniquely capable of developing face processing expertise using early visual input, indicating hemispheric asymmetry in this function.