### Thinking hot and cool

**In the 1960s, Mischel** and colleagues at Stanford launched a series of delayed-gratification experiments with young children using a method that later came to be known as “the marshmallow test.” A researcher whom the child knew and trusted, after playing some fun games together, suggested playing a “waiting game.” The researcher explained that the child could have either one or two of the highly attractive treats the child had chosen and was facing (marshmallows, cookies, pretzels)--depending on how long the child waited for them after the researcher left the room. The game was: at any time the child could ring a bell, and the researcher would come back immediately and the child could have _one_ treat. To practice, the researcher left the room, the child rang the bell and the researcher came right back, saying, “You see, you brought me back. Now if you wait for me to come back by myself without ringing the bell or starting to eat a treat you can have _both_ of them!!” The wait might be as long as 15 or 20 minutes. (About one third made it that far.)

The kids varied widely in how long they could stand it before ringing the bell. Mischel emphasizes that the focus of the research was to identify the specific cognitive strategies and mental mechanisms, as well as the developmental changes, that make delay of gratification possible--not to “test” or pigeonhole children. Between the ages of 4 and 6 years, for example, the older kids could delay their gratification longer, apparently as the impulse-overriding “executive function” of their maturing brains kicked in. And in some conditions it was easy for the children to wait, while under other conditions it was very difficult. The research sought to identify the cognitive skills that underlie willpower and long-term thinking and how they can be enhanced.

Longitudinal studies of the tested children suggested that something profound was going on. By the time they were adolescents, the kids who had been able to hold out longer for the bigger reward in some conditions were also likelier to have higher SAT scores, to function better socially, and to manage temptation and stress better. On into their adulthood, they were less likely to show extreme aggression, less likely to over-react if they became anxious about social rejection, and less likely to become obese. For the kids who did not hold out well and took the quick reward, Mischel said the findings suggested that “the inability to delay gratification can have quite serious potential negative effects.” (Mischel cautions that the longitudinal results are only correlations that describe group findings and do not allow accurate predictions for individual children.)

Can “delay ability” be trained? Mischel thinks it can, if we understand how our mind works. He and colleagues postulated a “Hot System” and a “Cool System” in the brain. (They are similar to Daniel Kahneman’s “System 1” and “System 2” in his book _Thinking Fast and Slow_.) The Hot System (Go!) is: emotional, simple, reflexive, fast, and centered in the amygdala. It develops early in the child and is exacerbated by stress. The Cool System (Know), on the other hand, is: cognitive rather than emotional, complex, reflective, slow, and centered in the frontal lobes and hippocampus. It develops later in the child and is made weaker by stress. In the Hot System the stimulus controls us; in the Cool System we control the stimulus.

You can chill a hot object of desire by representing it to yourself in Cool, abstract terms. Don’t think of the marshmallow as _yummy and chewy_ ; imagine it as _round and white_ like a cotton ball. One little girl became patient by pretending she was looking at a picture of a marshmallow and “put a frame around it” in her head. “You can’t eat a picture,” she explained. (Girls were better handling temptation than boys.)

While coolly defusing a temptation, you can also make Hot the delayed consequences of yielding to it. Mischel was a three-pack-a-day smoker ignoring all warnings about cancer until one day he saw a man on a gurney in Stanford Hospital. “His head was shaved, with little green X’s, and his chest was bare, with little green X’s.” A nurse told him the X’s were for where the radiation would be targeted. “I couldn’t shake the image. It made hot the delayed consequences of my smoking.” Mischel kept that image alive in his mind while reframing his cigarettes as sources of poison instead of relief, and he quit.

“If you don’t know how to delay gratification,” he said, “you don’t have a choice. If you do know how, you have a choice.”