Psychosurgery refers to surgical procedures performed on brain tissue to alleviate psychological disorders.
Other /More definition:
Psychosurgery refers to a kind of surgery that entails the cutting of fibers connecting particular parts of the brain or the removal or destruction of areas of brain tissue with the goal of modifying severe behavioral or emotional disturbances.

Moreover, Psychosurgery refers to a form of brain surgery, the purpose of which is to reduce psychological disturbance. It is the use of brain surgery to treat mental disorders.
Other /More definition:
Psychosurgery refers to a form of brain surgery, the purpose of which is to reduce psychological disturbance.