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.
Epiblepharon is a condition characterised by a congenital horizontal fold of skin near the margin of the upper or lower eyelid caused by the abnormal insertion of muscle fibres. This extra fold of skin redirects the lashes into a vertical position, where they may contact the globe of the eye. This is found most commonly in Asian individuals, especially children. One estimate puts the percentage of affected Asian children aged 7–14 years old at 12.6%. References


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