r/SDAM

2.2K archived posts · Nov 2017 – Sep 2026

Severely Deficient Autobiographical Memory

r/SDAM

Severely Deficient Autobiographical Memory (SDAM) refers to a lifelong inability to vividly recollect or re-experience personal past events from a first-person perspective. Many people who have r/Aphantasia have SDAM.

Created Nov 10, 2017

9.9KMembers (last snapshot)

2.2KArchived posts

SDAM (Severely Deficient Autobiographical Memory) is a relatively new discovery of the inability of a person to recall events in the past. It is not memory loss, Alzheimer's, or dementia. It is associated with the inability to vividly recall experiences, such as not having many, if any at all, childhood memories. Another example would be not remembering many details about your wedding day. SDAM seems to be related somewhat with r/Aphantasia (the inability to vividly picture things in your mind). Both though seem to exist on a spectrum. Obviously it does not seem to limit normal functioning or learning ability. We are here to find out more about it and its impacts.

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