Hyperthymesia, also known as hyperthymestic syndrome or extremely superior autobiographical memory (HSAM), is a condition that leads people to be able to remember an abnormally massive number of their life experiences in vivid detail. A one who has hyperthymesia known as a hyperthymesiac. American neurobiologists Elizabeth Parker, Larry Cahill and James McGaugh (2006) identified two defining traits of hyperthymesia: spending an excessive amount of time desirous about one's past, and displaying an extraordinary skill to recall specific events from one's previous. The authors wrote that they derived the phrase from Historical Greek: hyper- 'extreme' and allegedly thymesis 'remembering', although such a word just isn't attested in Historical Greek, but they may have been pondering of Fashionable Greek thymisi 'memory' or Historical Greek enthymesis 'consideration', which are derived from thymos 'mind'. Hyperthymesiacs can extensively recall the occasions of their lives, as well as public occasions that hold some personal significance to them. These affected describe their reminiscences as uncontrollable associations; after they encounter a date, they "see" a vivid depiction of that day in their heads without hesitation or conscious effort.