<unk> (also known as "H.M." and "Henry M.," born 1926 in Connecticut) is an anonymous memory-impaired patient who has been widely studied since the late 1950s and has been very important in the development of theories that explain the link between brain function and memory, and in the development of cognitive neuropsychology, a branch of psychology that studies brain injury to infer normal psychological function. He is still alive today and resides in a care institute located in Hartford, Connecticut, where he remains in ongoing investigation.  Audio-recordings from the 1990s of him talking to scientists were released in early 2007.
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