Ability to calculate rapidly {calculating genius} depends on knowing numerical facts and short-cut methods. It does not develop by prolonged, cumulative experience. It atrophies with disuse. Calculating geniuses generate answers right-to-left, in same way as if using paper-and-pencil procedure.
Developmentally disabled people can have special right-brain talents {idiot savant}|, such as music, painting, or procedural memory. Idiot savant typically has left-hemisphere damage.
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Date Modified: 2022.0225