Abstract
The concept of criminal responsibility was almost established one hundred years ago in Japan. But it was mainly conceived as the legal concept not as the medical one. Recently a lot of information about the frontal lobe function has been utilized in accordance with the development of the brain functional image or the neuropsychological assessment. Although these methods are still under developing, they give us a lot of useful information about the human behaviors including the criminal conducts. In this current situation of psychiatry, the criminal responsibility should be judged by these methods. This paper presents two cases of psychiatric testimonies.
