An inability to recall important autobiographical information that is inconsistent with ordinary forgetting.
- Anterograde amnesia. Loss of memory of events that occur after the onset of the etiological condition or agent.
- Retrograde amnesia. Loss of memory of events that occurred before the onset of the etiological condition or agent.

Adapted from American Psychiatric Association. Diagnostic and Statistical Manual of Mental Disorders. 5th ed. Washington, DC. American Psychiatric Association. 2013. Internet. Accessed on May 17, 2016.