H.M. had deep and long-lasting anterograde amnesia. Thus, the right term is amnesia.
<h3>What is amnesia?</h3>
Amnesia is a temporary loss of memory caused by brain injury or disease, but it can also be caused by the use of sedatives and hypnotic medicines. Due to the level of the injury, the memory may be completely or partially lost. Amnesia is classified into two types: retrograde amnesia and anterograde amnesia. Retrograde amnesia is the inability to recall knowledge gained prior to a specific date, generally the date of an accident or procedure. In some cases, the memory loss can last decades, whereas, in others, the person may only lose a few months of memory. The failure to transmit new knowledge from the short-term store to the long-term store is referred to as anterograde amnesia. Anterograde amnesia is the inability to recall things for extended periods of time. These two categories are not mutually exclusive; they can coexist.
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