�y��vlog

He was now suffering from anterograde amnesia, remembering all the events before the surgery but unable to form new memories.

A 1953 operation to remove his hippocampus left H.M. with nearly perfect anterograde amnesia, meaning he could form short- but not long-term recollections, rendering him the ideal subject for memory studies.

In medical terms this memory loss is a form of temporary anterograde amnesia, a condition where the ability to form new memories is, for a limited time, impaired.

H.M. developed anterograde amnesia: from the age of 27 he never formed a new long-term memory.

H.M.’s inability to form new memories is characteristic of what is called anterograde amnesia.