Learning face perception without vision: Rebound learning effect and hemispheric differences in congenital vs...

Area of Science:

• Neuroscience
• Cognitive Science
• Psychology

Background:

• Investigating the existence of an innate face schema in individuals blind from birth.
• Understanding the neural mechanisms of non-visual face learning and plasticity.
• Exploring interhemispheric differences in face processing among the blind.

Purpose of the Study:

• To determine if congenitally blind individuals have a pre-existing face schema.
• To examine plasticity mechanisms in non-visual face learning.
• To identify interhemispheric differences in face processing in blind populations.

Main Methods:

• Utilized a novel Cognitive-Kinesthetic Drawing approach for non-visual training.
• Trained congenitally blind (CB), late-blind (LB), and blindfolded-sighted (BF) adults.
• Conducted functional MRI scans before and after a five-day haptic face exploration and drawing training.

Main Results:

• Tactile face perception activated the occipito-temporal cortex in all groups.
• Blind groups showed predominantly left-hemispheric reorganization, while blindfolded-sighted showed right-hemispheric changes.
• Positive learning effects for face perception in CB and BF groups, but negative in LB group, indicating category-specific plasticity.

Conclusions:

• Results suggest a pre-existing face schema in congenitally blind individuals, unmasked and tuned by training.
• Demonstrated significant interhemispheric differences in non-visual face processing.
• The Cognitive-Kinesthetic Training is effective in driving brain plasticity and offers insights into non-visual learning and neurorehabilitation.