Final answer:
Patient H.M. did not show a dissociation between working memory and long-term memory because he retained his short-term memory abilities. His anterograde amnesia due to medial temporal lobe damage prevented forming new long-term episodic and semantic memories, not affecting his immediate working memory. The correct option is D.
Step-by-step explanation:
Patient H.M. displayed dissociations between many types of memory, but not between working memory vs. long-term memory. This is because H.M. retained his short-term (working) memory abilities, such as what is assessed with tasks like repeating three words immediately after they were presented.
Although H.M. could not convert short-term memories into long-term ones due to his surgery, which impacted his medial temporal lobes leading to anterograde amnesia, he could still utilize working memory for brief periods. It is important to differentiate his condition from the other types of memory dissociations. H.M. could not form new explicit memories (such as episodic and semantic memories), evidenced by his inability to recall reading the same magazine or meeting new people post-surgery.
Nonetheless, he exhibited an ability to form certain types of implicit memories, as he became faster at solving puzzles with repeated exposure despite not recalling previous attempts. The correct answer to the question is thus (d) working memory vs. long-term memory.