Extensive complex neocortical movement topography devolves to simple output following experimental stroke in mice.

Area of Science:

• Neuroscience
• Motor control
• Stroke research

Background:

• The neocortex is crucial for motor output in mammals.
• Neocortical reorganization after stroke influences motor recovery.
• Understanding these changes is vital for optimizing clinical care.

Purpose of the Study:

• To investigate alterations in neocortical motor output topography post-stroke.
• To correlate these changes with motor function recovery in mice.

Main Methods:

• Middle cerebral artery occlusion (MCAo) model in mice.
• Long-duration intracortical microstimulation (LD-ICMS) to map motor outputs.
• Single pellet reaching (SPR) task to assess forelimb motor function.

Main Results:

• MCAo injury altered neocortical motor maps 6 weeks post-stroke.
• Reduced area for complex movements, increased area for simple movements.
• Motor recovery correlated positively with the area of specific motor outputs.

Conclusions:

• Stroke significantly reorganizes the neocortical motor map.
• Specific changes in motor map area relate to functional recovery.
• Findings inform strategies for stroke rehabilitation and neuroplasticity research.