Indeed, evidence indicates that play is evolutionarily quite ancient. Rats that have had their neocortex removed—a large brain region that is involved in higher-order thinking such as conscious thought and decision making—still engage in normal play, which suggests that play motivation comes from the brain stem, a structure that precedes the evolution of mammals. “This means that the core, genetically-provided circuitry for play is situated in very ancient regions of the brain,” explains Panksepp, who led the experiment in 1994.

Of course, many parents today believe they are acting in their kids’ best interests when they swap free play for what they see as valuable learning activities. Some mothers and fathers may also hesitate to let their kids play outside unattended, and they may fret about the possibility of the scrapes and broken bones that sometimes arise during play fighting or rambunctious fantasy play, says Sergio M. Pellis, a behavioral neuroscientist at the University of Lethbridge in Alberta. Although those instincts are natural, protecting kids “simply defrays those costs to later, when those same children will have difficulty in dealing with an unpredictable, complex world,” Pellis says. “A child who has had a rich exposure to social play experiences is more likely to become an adult who can manage unpredictable social situations.”

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ABOUT THE AUTHOR(S)
Melinda Wenner is a freelance science writer based in Brooklyn.