The missing piece may relate to what Zentall described as the optimal stimulation model. “It says that animals and we humans have a level of stimulation that we prefer,” he said. “And when it gets below that, we search for stimulation.” As he explained, “When you think of humans today, I think a lot of us get bored with how easy it is to get resources. We spend less of our time exploring and foraging for food. We spend less time outside. Our social worlds have changed. So we search for other ways to fill this gap in stimulation, to distract or comfort ourselves….We gamble, we shop online, we
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