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Question 46 Patient H.M. had part of his medial temporal lobes, including the hippocampus, removed to eliminate seizures. After his surgery, H.M. could no longer remember his life before the surgery. retrieve old implicit memories. form new explicit memories. form new implicit memories.

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Form new explicit memories.

Explanation: Removal of the hippocampus caused severe anterograde amnesia for declarative (explicit) memory — H.M. could not form new conscious memories of events or facts. He retained many older (remote) memories and could learn new implicit (procedural) skills (e.g., mirror‑tracing), showing implicit memory was relatively preserved.