Highly Superior Autobiographical Memory (HSAM) is characterized by an exceptional ability to recall personal past events with remarkable accuracy and detail.
Compared to existing data from ordinary folks, KCL had a “markedly elevated” frequency of involuntary autobiographical memories arising during his tests.
He described having exceptionally early autobiographical memories, including recollections dating back to approximately three months of age.
the growing evidence suggests HSAM is not so much a case of generally superior memory, but “a shift in the dynamics of retrieval, characterized by heightened cue sensitivity and a lowered threshold for accessing autobiographical information.”
https://www.sciencedirect.com/science/article/pii/S0010945226002364