Patients who have impaired memory for events occurring before the onset of their memory loss are said to be suffering from:

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Retrograde amnesia is a type of memory loss that involves the inability to remember events that occurred before the onset of the memory impairment. This is in contrast to anterograde amnesia, which involves the inability to form new memories after the onset of the memory impairment. Proactive and retroactive amnesia refer to the interference of old or new memories with the retention of new or old memories, respectively. Global amnesia refers to a severe and often sudden loss of memory, which can affect both retrograde and anterograde memory.

Patients Who Have Impaired Memory for Events Occurring Before the Onset