Hypomnesia is a decrease in various forms and types of memory, often progressing at different rates to the degree of amnesia, including systemic. The increase in hypomnesia, points out V.M. Bleicher, is characterized by a well-known sequence. Initially, the weakening of memory concerns voluntary reproduction. Then the retention of information in memory comes to the fore, and only after that does the memorization of current impressions suffer.

The disorder primarily concerns reference information that cannot be systematized and included in the patient’s existing cognitive structures (names, surnames, titles, terms, dates, phone numbers, faces, etc.). Accordingly, the clinical diversity of hypomnesia is quite large. It is important to note that the first signs of memory decline are determined only subjectively; testing in this case does not give definite results. It is also worth paying attention to the fact that by memory loss, patients often mean attention problems. Clinically, the following variants of hypomnesia are more or less clearly distinguished.