Working memory performance will be assessed using the "3-back test", and processing speed evaluated with "words comparison test". The study will be conducted on 2 years. The study should include 18 right-handed females victims of sexual abuse and suffering from PTSD, and 18 controls right-handed females without any history of abuse ad not suffering from PTSD. Brain activation will be measured during performance of working memory tasks (3-back test) and processing speed test using functional magnetic resonance.