H.M.had much of his hippocampus removed to alleviate seizures.An unfortunate side effect was impaired explicit memory,even though later testing revealed that his implicit memory was spared.This result provides one half of a double dissociation.In order to complete the double dissociation,which of the following patients would need to be found?

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A double dissociation occurs when two related mental processes are shown to function independently of each other. In this case, H.M. demonstrated that it's possible to have impaired explicit memory while retaining implicit memory, implicating the hippocampus in explicit memory processing but not in implicit memory. To complete the double dissociation, a patient with the opposite condition—intact explicit memory but impaired implicit memory—would need to be found. This would show that the two types of memory can be affected independently, suggesting they involve different brain mechanisms or areas.

HMHad Much of His Hippocampus Removed to Alleviate Seizures