Humans are determined reward-seekers. It’s a built-in motivation that keeps us on the hunt for food, water, sex and nurturing — things that keep us alive and thriving.

We also universally prefer those rewards to come sooner rather than later. In some people, however, that preference is more pronounced than in others. And we have a word for it: impulsivity.

In large part, impulsivity is a reward deficiency — a tendency to value immediate gratification over future rewards,...
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