 The unit ceased operating in 1994.A team at Kings College Hospital under psychiatrist Stuart Checkley took over the work of the unit and performed 23 stereotactic subcaudate tractotomies over the next five years, using radiofrequency to destroy brain tissue.Capsulotomy, or anterior capsulotomy, in which part of the internal capsule in the frontal lobe is destroyed, was first used in France in the late 1940s and used extensively in Sweden.