Advanced memory is the key "superpower" in savant abilities.Approximately half of savants are autistic; the other half often have some form of central nervous system injury or disease. It is estimated that up to 10% of those with autism have some form of savant abilities. Calendrical savants
A calendrical savant (or calendar savant) is someone who – despite having an intellectual disability – can name the day of the week of a date, or vice versa, on a limited range of decades or certain millennia. The rarity of human calendar calculators is possibly due to the lack of motivation to develop such skills among the general population, although mathematicians have developed formulas that allow them to obtain similar skills. Calendrical savants, on the other hand, may not be prone to invest in socially engaging skills. Mechanism
Psychological
No widely accepted cognitive theory explains savants combination of talent and deficit. It has been suggested that individuals with autism are biased towards detail-focused processing and that this cognitive style predisposes individuals either with or without autism to savant talents. Another hypothesis is that savants hyper-systemize, thereby giving an impression of talent. Hyper-systemizing is an extreme state in the empathizing–systemizing theory that classifies people based on their skills in empathizing with others versus systemizing facts about the external world. Also, the attention to detail of savants is a consequence of enhanced perception or sensory hypersensitivity in these unique individuals.
Like idiot savant, the term came to be considered a misnomer because only half of those who were diagnosed with savant syndrome were autistic. Upon realization of the need for accuracy of diagnosis and dignity towards the individual, the term savant syndrome became widely accepted terminology. Society and culture
Notable cases
Aleksander Vinter, known as "Savant", musician and producer
Daniel Tammet, British author and polyglot
Derek Paravicini, British blind musical prodigy and pianist
Henriett Seth F., Hungarian autistic writer and artist
Kim Peek, American "megasavant"
Leslie Lemke, American musician
Rex Lewis-Clack, American pianist and musical savant
Matt Savage, American musician
Stephen Wiltshire, British architectural artist
Temple Grandin, American professor of animal science
David M. Nisson, American scientist
Tom Wiggins, American blind pianist and composer
Tommy McHugh, British artist and poet
Kodi Lee, 2019 Americas Got Talent winner (musician)

Acquired cases
Alonzo Clemons, American acquired savant sculptor
Anthony Cicoria, American acquired savant pianist and medical doctor
Derek Amato, American composer and pianist, he has developed savant syndrome and synesthesia
Patrick Fagerberg, American acquired savant artist, inventor and former lawyer.