The decline of unsupervised free play is our fourth explanatory thread. Children, like other mammals, need free play in order to finish the intricate wiring process of neural development. Children deprived of free play are likely to be less competent—physically and socially—as adults. They are likely to be less tolerant of risk, and more prone to anxiety disorders. Free play, according to Peter Gray, is “activity that is freely chosen and directed by the participants and undertaken for its own sake, not consciously pursued to achieve ends that are distinct from the activity itself.” This is
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