when a branch of psychology, sometimes called performance psychology, began to...

when a branch of psychology, sometimes called performance psychology, began to systematically explore what separates experts {in many different fields} from everyone else. In the early 1990s, K. Anders Ericsson, a professor at Florida State University, pulled together these strands into a single coherent answer, consistent with the growing research literature, that he gave a punchy name: deliberate practice.

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