The first convincing experimental evidence for a dissociation between declarative memory ( " knowing what " ) and non-declarative or procedural ( " knowing how " ) memory was from Milner ( 1962 ), by demonstrating that a severely amnesic patient, Henry Molaison, formerly known as patient H . M ., could learn a hand eye coordination skill ( mirror drawing ) in the absence of any memory of having practiced the task before.
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