Abstract
I encountered two girls with "handedness involuntary movement" who were diagnosed as having a conversion disorder, and treated by psychotherapy. They had histories of sexual abuse. Patient 1 was 13 years old. Six months after psychotherapy was started, she told her mother that she had been forced to lend a hand to masturbate her mother's lover during the time between the ages of 10 to 12. Patient 2 was 15 years old. She was suspected of having a history of sexual abuse because her disorder was similar to Patient 1. When asked whether she had been sexually abused, she responded that she had also been forced to masturbate. The "handedness involuntary movement" in these two patients was considered to have been caused by being forced to masturbate.