Which type of memory was least impaired in patient H.M.?

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Patient H.M. had damage to his medial temporal lobe, which is critical for the formation of declarative memories (memory for facts and events) and thus had severe impairments in episodic and explicit memory. However, his procedural memory (memory for skills and habits) was relatively intact, as evidenced by his ability to learn and improve on motor tasks despite not remembering doing the tasks before.

Which Type of Memory Was Least Impaired in Patient H