Impact of Deprivation and Preferential Usage on Functional Connectivity Between Early Visual Cortex and...

Area of Science:

• Neuroscience
• Visual Neuroscience
• Brain Plasticity

Background:

• Human behavior and brain function adapt to sensory input loss.
• Studies often examine how sensory deprivation alters brain function.
• The brain's ability to reallocate connectivity for remaining inputs after sensory loss is less understood.

Purpose of the Study:

• To investigate if the brain changes functional connectivity to prioritize remaining sensory inputs after central vision loss.
• To examine plasticity in the intrinsic functional connectivity of the sensory cortex in individuals with macular degeneration.

Main Methods:

• Resting-state functional magnetic resonance imaging (fMRI) was used in total darkness.
• The study included individuals with late-stage macular degeneration and selective vision loss.
• Functional connectivity was analyzed between visual areas and retinal representations (lesioned, preferentially used, and non-preferentially used peripheral areas).

Main Results:

• Cortical regions representing spared peripheral retina demonstrated plasticity in intrinsic functional connectivity.
• These spared peripheral areas showed stronger connectivity to area MT (motion processing), irrespective of preferential usage.
• The findings suggest widespread effects throughout the visual cortex due to long-term central vision loss.

Conclusions:

• The brain exhibits plasticity in functional connectivity within the visual cortex following central vision loss.
• Spared visual representations adapt their connections, even if not preferentially used.
• These results highlight the visual cortex's capacity for change beyond critical developmental periods.