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https://www.bps.org.uk/research-digest/calendar-calculating-savants-autism-how-do-they-do-it
27 July 2009. By Christian Jarrett. Savants with autism are people who exhibit an exceptional ability whilst also having social and cognitive impairments. One such ability is calendar calculating - being able to say, with astounding accuracy and alacrity, what day of the week a given date falls on. Just how some savants with autism are able

https://www.pbs.org/wgbh/nova/body/savant-brain.html
NOVA scienceNOW. George Widener has been a calendar-calculating savant since childhood, but other savants seem to acquire extraordinary gifts spontaneously, typically following a brain injury

https://www.cbsnews.com/news/meet-a-calendar-savant/
Savants: Mark your calendar 03:04. Dustin Hoffman won the Oscar for Best Actor for his portrayal of a savant in the 1988 film "Rainman." Susan Spencer introduces us to several real-life savants:

http://whoville.ucsd.edu/PDFs/423_Kennedy_Squire.pdf
formance of the calendar savant Donny, Thioux et al. (2006) proposed that his abilities, which extend from year 1 A.D. to 9999 A.D., are based on "a large foundation of memorized date- weekday associations, arithmetic, and some knowledge of the rules of calendars." The calendar ability of some savants covers only a limited set of years.

https://onlinelibrary.wiley.com/doi/full/10.1111/j.1469-8749.2012.04250.x
Savant calendar calculators can name the day of the week of past or future dates at speed, often in the presence of considerable intellectual impairment. 1 Calculation spans vary, but have been reported to be up to 40 000 years in range. 2 Calendar calculation is often associated with autism spectrum disorder (ASD), 3 but is also seen in those with non-specific learning disabilities* 4 and in

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2917639/
Here we present a case of patient AC596, a 25-year old male with severe episodic memory impairments, presumably due to anoxia during a preterm birth. In contrast to his poor episodic memory, he exhibits savant-like memory for calendar information that can be flexibly accessed by day, month, and year cues.

https://www.sciencedirect.com/science/article/pii/S0010027705001447
Calendrical calculation is the unusual skill of identifying weekdays corresponding to past and future dates. Calendrical savants are people with this skill in conjunction with pervasive developmental disorders or severe intellectual impairments. This paper compares calendrical savants to a mathematician and investigates a calendrical savant's

https://www.cambridge.org/core/journals/psychological-medicine/article/abs/date-to-remember-the-nature-of-memory-in-savant-calendrical-calculators/76BD98FEB557019395D1C588949CF5BE
Rather, through exposure to date information, the savants are suggested to develop a structured calendar-related knowledge base with the process of calculation utilizing the interrelations within this knowledge store. The cognitive processing style characteristic of autism may also play a role in the acquisition of this savant ability.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2677581/
Reference books and perpetual calendars do not cover more than 400 years in the Gregorian period, as the Gregorian calendar repeats every 400 years. Typically, they cover fewer. So a savant who can answer questions concerning years more than 400 years in the future must calculate to work out the correspondence between a remote year and a closer

https://royalsocietypublishing.org/doi/abs/10.1098/rstb.2008.0323
De Marco M, Iavarone A, Santoro G and Carlomagno S (2015) Brief Report: Two Day-Date Processing Methods in an Autistic Savant Calendar Calculator, Journal of Autism and Developmental Disorders, 10.1007/s10803-015-2626-z, 46:3, (1096-1102), Online publication date: 1-Mar-2016.

https://www.scientificamerican.com/article/inside-the-mind-of-a-sava/
Inside the Mind of a Savant. Kim Peek--the inspiration for Rain Main --possesses one of the most extraordinary memories ever recorded. Until we can explain his abilities, we cannot pretend to

https://www.sciencedirect.com/science/article/abs/pii/S0278262614001146
Nevertheless, there is also data supporting that savant calendar calculators use strategies and regularities of the Gregorian calendar for CC (Heavey et al., 2012, Hermelin and O'Connor, 1986, O'Connor and Hermelin, 1984, Young and Nettelbeck, 1994). Calendar calculators may also differ with regard to their stage of skill development and

https://listverse.com/2013/07/23/10-fascinating-people-with-savant-syndrome/
5 Flo and Kay Lyman. Florence and Katherine Lyman are also twins who share the same remarkable ability. And oddly enough, they're the only other known set of savant twins with the same calendar-counting talent. But Flo and Kay are remarkable even when compared in the amazing talent pool of savants.

https://learnmem.cshlp.org/content/14/8/533.full
Abstract. We acquired large data sets of calendar performance from two autistic calendar savants, DG and RN. An analysis of their errors and reaction times revealed that (1) both individuals had knowledge of calendar information from a limited range of years; (2) there was no evidence for the use of memorized anchor dates that could, by virtue of counting away from the anchors, allow correct

https://www.researchgate.net/publication/247528306_Neuropsychological_Studies_of_Savant_Skills_Can_They_Inform_the_Neuroscience_of_Giftedness
the savant literature: calendar calculation (i.e., ability to name the day of the week on which a particular date [past, present, or future] has fallen or will fall), lig htning mental

https://www.sciencedirect.com/science/article/pii/S0278262614001146
Using magnetoencephalography (MEG), we presented 126 calendar tasks with dates of the present, past, and future. Event-related magnetic fields (ERF) of 3000 ms duration and brain activation patterns were compared in three savant calendar calculators with ASD (ASDCC) and three typically developing calendar calculators (TYPCC). ASDCC outperformed

https://www.psychologytoday.com/us/blog/explorations-of-the-mind/202310/the-puzzle-of-the-savant-mind
Darold Treffert, a Wisconsin psychiatrist who studied the Savant Syndrome for over 50 years, is of the opinion that the brain of a person who has suffered a severe head injury is capable of

https://www.inf.ed.ac.uk/teaching/courses/ics/Heavey_etal_99.pdf
It is probable that savant date calculation depends on a combination of these different explanations and may vary from individual to individual, depending on initial experience with the calendar and the ability level of the savant. For example, small calculation spans may be achieved on the basis of practice and rote learning.

https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1469-8749.2012.04250.x
It has been suggested that structural knowledge plays a key role in the acquisition and operation of savant date calculation skills. features of the calendar in eight savant calendar calculators (seven males; one female; median age 34y 6mo; age range 27-47y), five of whom had a diagnosis on the autism spectrum.

https://personal.utdallas.edu/~otoole/CGS/R12.pdf
Since then, in almost all cases, savant memory has been linked to a specific domain, such as music, art or mathematics. But phenomenal memory is itself the skill in a 54-year-old man named Kim Peek. His friends call him "Kim-puter.". KIM PEEK stands in front of an image of his brain. He can, indeed, pull a fact from his mental library as

https://www.sciencedirect.com/science/article/abs/pii/0732118X9500003Y
Naming the days of the week for dates in the past and future is a rare talent observed in people with low measured intelligence. The talent and other savant skills are more common in the autistic population, suggesting features of autistic cognition such as obsessive preoccupation and weak central coherence may facilitate development of savant skills.

https://molecularautism.biomedcentral.com/articles/10.1186/s13229-018-0237-1
Methods Participants. One hundred and eleven participants took part in the study. They comprised 44 autistic individuals with savant skills ('autistic-savants': 23 female; mean age 36.52, range 20-55, SD = 9.56), 36 autistic individuals without a savant skill ('autistic-nonsavants': 23 female; mean age 36.67, range 18-51, SD = 9.35), and 31 typical controls with neither autism nor