We've all heard about the Stanford marshmallow experiment, but: "Kids from wealthier families waited longer than kids from low-income families. Not because they had more self-control, but because ...

One major criticism of the Stanford Marshmallow Experiment is that it presupposes that the child trusts the adult conducting the experiment to actually deliver the promised reward.

The Stanford Marshmallow Test, conducted by researcher Walter Mischel in the late 1960s, found that children who could delay immediate gratification — by waiting to eat a marshmallow placed ...