Oct
5
Though the deprivation experiment is hard to do, that very fact means that seeing an animal play already tells us something good about its state. In young squirrel monkeys, low levels of cortisol are associated with high amounts of play, suggesting either that play reduces stress or, possibly, that unstressed monkeys are more likely to play. In bear cubs during their first year of life, survival over the winter is highly correlated to the amount that cubs played during the preceding summer. Play might be an indicator of health or resistance to stress. No matter how you slice it, seeing your child play is a good sign.
Play, Stress, and the Learning Brain - Dana Foundation