HM and memory: what does HM tell us about memory?

HM and memory: what does HM tell us about memory?

• A. HM's hippocampus removal had no effect on memory.
• B. HM retained explicit long-term memory but lost implicit memory.
• C. HM's hippocampus removal caused selective retrograde amnesia only.
• D. HM's hippocampus removal caused severe anterograde amnesia, with preserved implicit memory.

Answer: (D)