[Plastic changes in the intact cerebral cortex resulting from local damage to its symmetrical section]

Area of Science:

• Neuroscience
• Neurophysiology
• Biochemistry

Background:

• The brain exhibits plasticity, allowing for functional reorganization after injury.
• Understanding how sensory representations adapt is crucial for recovery research.

Purpose of the Study:

• To investigate the expansion of the radial nerve's representation in the opposite hemisphere after parietal cortex damage.
• To analyze associated biochemical changes during this neuroplasticity period.

Main Methods:

• Recording focal potentials in cats to map the radial nerve representation.
• Inducing electrolytic lesions in the associative parietal cortex.
• Assessing lactate dehydrogenase and malate dehydrogenase activity and isoenzyme spectrum.

Main Results:

• Radial nerve representation expanded in the contralateral hemisphere 3-4 months post-lesion.
• Changes in lactate dehydrogenase and malate dehydrogenase activity and isoenzyme patterns were observed concurrently.

Conclusions:

• The study demonstrates significant neuroplasticity in sensory cortex representation following cortical injury.
• Biochemical markers correlate with functional reorganization, suggesting a link between metabolic changes and brain adaptation.