Savant syndrome

How it works

Savant skills fall into a small number of areas: calendar calculation, music, art, arithmetic, and spatial or mechanical skill¹. Almost all rest on a huge memory for one kind of material. A calendar savant can name the weekday of any date across centuries. A musical savant can play back a long piece after hearing it once. About half of savants are autistic. The rest have another developmental condition or a brain injury¹.

The cause is not settled. One hypothesis is that damage or unusual development in the left hemisphere leads the right hemisphere to take over and grow stronger in the skills it handles, such as pattern and spatial processing¹. A supporting clue is acquired savant syndrome, in which a person develops a savant skill after a head injury or a dementia that affects the left front of the brain¹. Another hypothesis is unusually direct access to raw sensory detail that most brains filter out. Neither is proven.

Males outnumber females about 6 to 1¹. The skills appear in childhood and usually last. Practice sharpens them but does not create them.

How common it is

Savant syndrome affects about 1 in 1,000,000 people¹. Between 0.5% and 10% of autistic people show some savant skill¹. Prodigious savants, whose skill would be remarkable even in a person without disability, number fewer than 100 alive worldwide¹⁴.

History and culture

Kim Peek, born in 1951, read about 12,000 books and could recall almost all of them. He read two pages at once, one with each eye². He was the inspiration for the 1988 film Rain Man². Stephen Wiltshire, a British artist, drew a detailed panorama of Rome from memory after a single helicopter flight over the city³. Leslie Lemke, who was blind and had cerebral palsy, played Tchaikovsky’s Piano Concerto No. 1 after hearing it once on television¹. The psychiatrist Darold Treffert studied savants for over 50 years and coined the term prodigious savant⁴.