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Teen Remembers Every Day of Life
22 Sep
Summary
- A 16-year-old boy possesses Highly Superior Autobiographical Memory.
- He can recall personal life events in vivid detail from infancy.
- 87% of his spontaneous thoughts are involuntary memories of his past.

A 16-year-old boy, identified as KCL, exhibits Highly Superior Autobiographical Memory (HSAM), a rare condition also known as hyperthymesia. This allows him to recall personal life events with exceptional clarity and detail, unlike most individuals whose memories fade over time.
Researchers observed that KCL can access memories from as early as three months old. His spontaneous thoughts are predominantly involuntary autobiographical memories, accounting for 87% of his mind-wandering states. This contrasts sharply with typical individuals, where only 39% of such thoughts are memories.
This condition means memories readily become accessible, though HSAM does not equate to a perfect or infallible memory. Scientists are exploring whether this increased accessibility of memories is common among others with HSAM and if their threshold for memories entering consciousness is lower.