SDAM and autobiographical memory

Aphants describing the closely-linked condition where personal past is stored as facts, not relived experience.

What people actually say

Discovering there's a name for it

Many threads hinge on someone naming SDAM and another user recognising themselves in the description.

"I have described myself as having a "weak autobiographical memory" for years now. Glad there's a name for it." 2019 · t1_ek0ppo8 ↗

"Yup. That's me." 2019 · t1_fbfw4rp ↗

"Look into SDAM.. severely deficient autobiographical memory. Your episodic memory (personal memories) are non existent.. It’s common for people with aphantasia to also have it. I just discovered a few days ago that I have this." 2022 · t1_ieb5lb0 ↗

Facts instead of lived experience

The most consistent description is that the past survives as semantic knowledge while the felt re-experiencing is gone.

"You remember facts and stuff, but not your subjective experiences and the like." 2019 · t1_ee8y3t7 ↗

"Many people with SDAM remember their past as a series of facts and bits of knowledge, rather than memories of lived experiences" 2023 · t1_j5m1zuq ↗

"Yeah, I can remember very few events from my life. For example, 7 years in the Navy is reduced to knowing when I was in, general facts about that time, plus three or four significant events I can describe in basic details." 2019 · t1_em7lcdp ↗

Childhood and recent past gone blank

A recurring pattern: the further back, the less remains, sometimes with whole stretches missing even from the last few years.

"Severly deficient certainly describes my autobiographical memory. I can barely remember last week, much less my childhood." 2016 · t1_d7sfv3h ↗

"I don't remember much about my life. I have some memories but the details are barely there. The farther back it goes, the less I remember." 2021 · t1_hdad5af ↗

"My memory outside of the last 3 years or so is incredibly spotty" 2025 · t1_nazemcn ↗

Partial overlap, not identity

Posters are careful to note the comorbidity is high but not total — plenty of aphants don't have SDAM, and some have a milder, "patchy" version.

"A lot of aphants have it, but most do not." 2024 · t1_liysteg ↗

"My autobiographical memory is very patchy. I don't think it's severely deficient though. I've described it in terms of a pie without much filling." 2018 · t1_e4kx2e0 ↗

"there seems to be a quite considerable overlap for aphantasia, prosopagnosia and Severely Deficient Autobiographical Memory Disorder." 2018 · t1_e4pm5eu ↗

Across the years

The pattern is strikingly stable from 2016 through 2025. Early posts (2016, 2018, 2019) already frame SDAM as a probable comorbidity and direct people to /r/SDAM, and later posts (2023, 2024, 2025) repeat the same explanations almost verbatim — a high-comorbidity link, the facts-vs-experience distinction, and the disclaimer that not all aphants are affected. Volume peaks in 2019 (6 chunks) and 2023 (9 chunks), tracking broader spikes in r/Aphantasia activity rather than any shift in how people describe the experience.

Volume

Cross-references

• Related sub-theme: themes/memory_autobiographical.md