[From a chapter on corpus callosotomy in my big fat textbook o' epilepsy, a.k.a. The Treatment of Epilepsy: Principles and Practice, 3rd ed, pp. 1178-1179]
A disturbing complication known as alien hand syndrome has been reported. In this syndrome, poor cooperation or even antagonistic behavior between the left and right hand is noted. The verbally dominant hemisphere may express displeasure with the actions of the ipsilateral extremities. The phenomenon is usually short lived and is usually seen only in the immediate postoperative period; however, on rare occasions it may persist....Is your non-dominant hemisphere plotting revolution? And how would you know?