The amnesia patient H.M. had an operation that accidentally caused memory damage and consequently he showed a mild memory loss for the events in his life that occurred one to two years before the operation. This type of memory loss is an example of what is called:

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Retrograde amnesia refers to the loss of pre-existing memories to conscious recollection, beyond ordinary forgetfulness, typically due to an injury or the onset of a disease. H.M.'s mild memory loss for events before the operation is an example of retrograde amnesia.

The Amnesia Patient H