"Perceived self-efficacy in coping with potential threats leads people to approach such situations anxiously, and experience of disruptive arousal may further lower their sense of efficacy that they will be able to perform skillfully"

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Play is a subset of voluntary behaviour involving a selective mechanism which reverses the usual contingencies of power so as to permit the subject a controllable and dialectical simulation of the moderately unmastered arousals and regulations of everyday life, in a way that is alternatively vivifying and euphoric.

— Brian Sutton-Smith