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It is a scientific principal developed by psychologists Robert M. Yerkes and J. D. Dodson in 1908 and is grounded within the discourses of biopsychology and neuroscience.
The process is often demonstrated graphically as an inverted U-shaped curve, increasing and then decreasing with higher levels of arousal.
It has been proposed that different tasks may require different levels of arousal. For example, difficult or intellectually demanding tasks may require a lower level of arousal for optimal performance to facilitate concentration, whereas tasks demanding stamina or persistence may be performed better with higher levels or arousal (to increase motivation).
There has been research indicating that the correlation suggested by Yerkes and Dodson exists (such as that of Broadhurst, 1959; Duffy, 1962; Anderson, 1988) but a cause of the correlation has not yet successfully been established (Anderson, Revelle and Lynch, 1989).
Despite some evidence existing in contrast to it, the law is generally respected.