Research has found that guitarists have much larger motor cortices in the hemisphere controlling the hand that does the fingering. The most likely cause of this increase in brain area is that guitarists play so much that they:

Question

Quizplus · Accepted Answer

Playing guitar involves repetitive and complex movements, which can lead to the creation of new synaptic connections in the motor cortex controlling the hand that does the fingering. This results in an increase in the size of the motor cortex, as it has to accommodate these new connections.

Research Has Found That Guitarists Have Much Larger Motor Cortices