Outside of pathology, the mechanism of forgetting seems pretty important: https://en.wikipedia.org/wiki/Hyperthymesia https://en.wikipedia.org/wiki/Hyperthymesi

Outside of pathology, the mechanism of forgetting seems pretty important: https://en.wikipedia.org/wiki/Hyperthymesia https://en.wikipedia.org/wiki/Hyperthymesia >Hyperthymesia, or highly superior autobiographical memory (HSAM), is a condition that leads people to be able to remember an abnormally large number of their life experiences in vivid detail. >Hyperthymestic abilities can have a detrimental effect. The constant, irrepressible stream of memories has caused significant disruption to Price's life. She described her recollection as "non-stop, uncontrollable and totally exhausting" and as "a burden".[1] Price is prone to getting lost in remembering. This can make it difficult to attend to the present or future, as she is permanently living in the past. Others who have hyperthymesia do not display any of these traits, however.