Korsakoff's psychosis is diagnosed by -

Memory impairment in korsakoff's syndrome Antegrade amnesia → New learning impaired. Retrograde amnesia → (Loss of memory of past events) Impaired recent memory Relatively preserved remote memory Impairment of explicit (conscious or declarative) type of long-term memory Relatively preserved implicit (unconscious or non-declarative) type of long-term memory Don’t get confuse remote memory with long-term memory. All remote memories are long-term memories. However, not all long-term memories are remote memories. Read below:- Recent memory includes both short-term (immediate) and long-term (delayed) memory. In Korsakoff's syndrome, recent memory is impaired, that means both short term and long term memories are involved. However, only long-term memory of recent past involved (say, for example, 20-30 minutes or 1 hour). Remote memory is long-term memory of more distant past, which is not impaired in Korsakoff's syndrome. Therefore, long-term memory of the distant past (say for example, before the onset of illness) is not impaired.