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Sound-encoded faces activate the left fusiform face area in the early blind
Paula L Plaza1, Laurent Renier1,2, Stephanie Rosemann1
1Laboratory of Integrative Neuroscience and Cognition, Department of Neuroscience, Georgetown University Medical Center, Washington, DC, United States of America.
Plos One
|November 22, 2023
Summary
Early blind individuals can learn to recognize faces using sound-encoded stimuli via a sensory substitution device (SSD). This suggests the fusiform face area (FFA) develops based on facial geometry, not visual input.
Area of Science:
- Neuroscience
- Cognitive Science
- Sensory Perception
Background:
- Face perception relies on specialized cortical regions, with development debated.
- Sighted individuals primarily use vision for faces; early blind individuals use auditory and tactile cues for shapes.
Purpose of the Study:
- To investigate if early blind individuals can learn face recognition using auditory stimuli.
- To determine if the fusiform face area (FFA) responds to non-visual face representations.
Main Methods:
- Utilized a sensory substitution device (SSD) to convert schematic faces into sound-encoded stimuli.
- Employed functional magnetic resonance imaging (fMRI) to measure brain activity.
Main Results:
- Early blind participants successfully distinguished faces from other shapes using the SSD.
- Functional MRI revealed preferential activation of the left fusiform face area (FFA) by sound-encoded faces.
Conclusions:
- FFA development is not solely dependent on visual face experience.
- Experience with facial configuration geometry may be crucial for FFA specialization.
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