Was der Marshmallow -Test über Kinderpsychologie falsch gemacht hat

A little bit longer:
“although performance on the task was correlated with achievement in adolescence, this relationship all but vanished when we accounted for other important factors in a child’s life, such as their general cognitive ability and socioeconomic status. In other words, we found that, if children were matched on these other factors, their ability to delay gratification was no longer related to their behavioural or academic outcomes later in life. We also recently followed up on this work and found the same was true for success in adulthood – once other factors are taken into account, the marshmallow test loses its predictive power.”