SDAM
Severely Deficient Autobiographical Memory. A lifelong pattern of not being able to mentally re-experience past events, while still remembering facts about them.
First described in a 2015 paper by Palombo and colleagues at the Rotman Research Institute in Toronto. People with SDAM typically retain the semantic scaffolding of their lives — where they grew up, who their family is, what school they went to — but cannot re-experience the events those facts describe. The knowledge persists; the re-living does not.
SDAM is lifelong. It is not dementia, which is a change from a higher baseline. It often co-occurs with aphantasia but is distinct from it.