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1. H.M. had moderate retrograde amnesia which is loss of memory for events in the past for about a year or two leading up to the surgery.
2. H.M.’s memory for remote events (such as events of his childhood) was intact.
3. H.M. had profound anterograde amnesia or memory loss for events that occurred following surgery.
--He can’t form any new Long Term memories!!!!
Formal Assessment of H.M.’s Anterograde Amnesia:
1. Digit Span +1 Test —5 digits were read to H.M. at 1 sec. intervals. If he got all 5 correct, on the next trial the same 5 digits were presented in the same sequence with 1 new digit added at the end & so forth for additional trials.
-After 25 trials of this task, H.M. still could not successfully repeat more than 7 digits (beyond STM span).
-Most normal Ss can learn up to 18 digits!!!
2. Verbal and Nonverbal Matching to sample tests :
The S is presented with a sample item & then after a delay, an array of test items is presented from which the S must select the one that matches the sample.
With verbal stimuli, H.M. did very well & could match the items! In contrast, H.M. performed very poorly with non-verbal stimuli.
He rehearsed the verbal material thereby keeping it in STM, but couldn’t do this with the non-verbal stimuli. Thus, his STM appeared to be working.