What is amnesia?
Memory loss, often through accident, disease or injury.
Anterograde Amnesia
A memory condition that means new long-term memories cannot be made.
Retrograde Amnesia
A memory condition that affects recall of memories prior to an injury to the brain.
What happened to Henry Molaison?
He had brain surgery and his hippocampus was damaged which caused him to have retrograde and anterograde amnesia.