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What and How the Deaf Brain Sees.

Caroline D C Alencar¹, Blake E Butler¹, Stephen G Lomber¹

¹University of Western Ontario.

Journal of Cognitive Neuroscience

|May 22, 2019

Summary

Deaf individuals exhibit enhanced visual processing due to crossmodal plasticity. Their auditory cortex reorganizes, improving functions like motion detection and facial discrimination compared to hearing individuals.

Area of Science:

Neuroscience
Sensory Processing
Crossmodal Plasticity

Background:

Sensory deprivation, such as deafness, can lead to compensatory enhancements in remaining sensory systems.
The brain's ability to reorganize (crossmodal plasticity) is a key area of interest in understanding sensory compensation.

Purpose of the Study:

To investigate enhanced visual processing abilities in deaf individuals.
To identify the specific cortical regions involved in crossmodal plasticity in the deaf brain.

Main Methods:

Review of psychophysical studies.
Analysis of functional imaging data.
Examination of reversible deactivation studies.

Main Results:

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Deaf individuals show superior performance in central visual functions (object/facial discrimination) and peripheral visual functions (motion detection, localization, visuomotor synchronization, Vernier acuity).

These enhanced visual functions are mediated by reorganized auditory cortex regions (e.g., BA 41, 42, 22 in humans; various auditory fields in cats, ferrets, and mice).

Conclusions:

Crossmodal reorganization within the auditory cortex is responsible for the superior visual abilities observed in deaf individuals.
These findings highlight the brain's remarkable adaptability in response to sensory loss.