I was talking about this a few weeks ago and realized I would eat the damn marshmallow. Researchers do not act in good faith. Maybe they're testing me for delayed gratification. Maybe they're measuring my anxiety levels as I wait for someone to come back with a promised reward. Maybe they want to know how angry I'd get if they come back and said they were out of marshmallows - or come back and flat out ate the marshmallow in front of me. A lot of researchers would happily trick me into thinking I was killing someone if they thought they could get away with it.
Its the truth that demolishes all the hand-waving about the marshmallow test - it relies on the subject's trust of the person running the experiment. I wouldn't trust them, why should anyone else?
When evaluated that way - particularly when testing on children - the outcome is painfully predictable.
- Children who have adults in life that they trust have better outcomes.
- Children who do not have adults in their lives who they trust have worse outcomes.