In the most, ahem, shocking study, subjects were wired up and given the chance to shock themselves during the thinking period if they desired. They’d all had a chance to try out the device to see how painful it was. And yet, even among those who said they would pay money not to feel the shock again, a quarter of the women and two thirds of the men gave themselves a zap when left with their own thoughts. (One outlier pressed the button 190 times in the 15 minutes.)

Maybe subjects just couldn’t decide where to steer their thoughts? Nope. In several studies, some were offered topics to fantasize about (going on a beautiful hike, etc.), but that tweak had no effect

Maybe modern technology is rotting our brains? Nope. Enjoyment was unrelated to age or the use of smart phones or social media. Wilson says if anything, use of technology is more a symptom than a cause

Wilson favors the “scanner hypothesis”: Mammals have evolved to monitor their environments for dangers and opportunities, and so focusing completely internally for several minutes is unnatural.

Wilson noted that the researchers don’t yet have strong evidence, but, he said, “I’m convinced it’s correct.”