Assertion: functional amnesia | /r/HasProperty | pathognomic sign
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text: Functional amnesia involving autobiographical memory is a pathognomic sign in a major class of mental illnesses known as dissociative (conversion) disorders , with sudden onset subsequent to physical trauma and/or psychologically stressful events, such as natural disasters (e.g., earthquakes and floods), marital discord, physical assault, personal threats, and war or military-related activities .