Ismet Berkan

“As I demonstrated this on Bob, he fell backwards onto me, completely inert and passive, with no hint of any reflexive reaction. Startled, I pushed him gently forward to the upright position, but now he started to topple forward; I could not balance him. I had a sense of bewilderment mixed with panic. For a moment, I thought that there had suddenly been a neurological catastrophe, that he had actually lost all his postural reflexes. Could acting like this, I wondered, actually alter the nervous system? The next day I was talking with him in his dressing room before the day’s shooting began, and as we talked, I noticed that his right foot was turned in with precisely the dystonic curvature it was held in when he portrayed Leonard L. on the set. I commented on this, and Bob seemed rather startled. “I didn’t realize,” he said. “I guess it’s unconscious.” He sometimes stayed in character for hours or days; he would make comments at dinner which belonged to Leonard, not himself, as if residues of the Leonard mind and character were still adhering to him.”
― Oliver Sacks, On the Move: A Life