Cortical thickness differences between hearing and perinatally deaf cats using ultra-high field MRI

Area of Science:

• Neuroscience
• Neuroimaging
• Comparative Anatomy

Background:

• The cerebral cortex exhibits plasticity, allowing regions to adapt to sensory input changes.
• Cortical thickness differences can reveal regional adaptations in sensory processing following sensory deprivation.

Purpose of the Study:

• To investigate cortical thickness changes in perinatally deafened cats compared to hearing cats.
• To identify specific brain regions affected by auditory deprivation and explore potential lateralization.

Main Methods:

• Acquisition of T1-weighted MRI scans from hearing (n=38) and deaf (n=31) cats using a 7T scanner.
• Comparative analysis of cortical gray matter thickness between the two groups.

Main Results:

• Deaf cats showed thicker cortices in sensory-related areas and thinner cortices in specific non-sensory regions compared to hearing cats.
• The left hemisphere exhibited greater susceptibility to cortical thickness changes after auditory deprivation.
• Findings suggest distinct mechanisms for sensory versus non-sensory cortical adaptations.

Conclusions:

• Auditory deprivation induces significant structural changes in the feline brain, supporting crossmodal plasticity.
• The results reinforce the task-retainment model of brain adaptation following sensory loss.