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The Marshmallow Test: How Preschoolers Learn to Wait, and What Mischel's First Study Really Showed

In short
Walter Mischel and Ebbe Ebbesen ran the first study of what became known as the marshmallow test. They expected that seeing the reward would help children wait — the opposite was true: children waited longest when the rewards were out of sight.

How the experiment worked
32 children (16 boys, 16 girls) from the Stanford University nursery school took part, aged 3.5 to almost 6 (median 4.5). Each child was offered two treats, one preferred. If they waited for the adult to return, they would get the preferred treat; if they rang a bell earlier, they got the less preferred one immediately. Children were assigned to four conditions: both rewards in view, only the delayed reward, only the immediate one, or neither. The maximum wait was 15 minutes.

Results
  • With no rewards in view, children waited about 11 minutes on average.
  • With both rewards in view — about 1 minute.
  • Children who waited longer invented ways to distract themselves: covering their eyes, singing, talking to themselves, even trying to sleep.
Conclusions and significance for developmental psychology
Self-control is not simply "willpower" — it is above all control of attention. This finding launched a decades-long research program on self-regulation. Later follow-ups linked preschool waiting time to adolescent achievement and competence (Shoda et al., 1990). A large 2018 replication found the link much weaker, largely explained by family background and early cognitive skills (Watts et al., 2018).
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What it means for parents
If your child struggles to wait, "just be patient" helps less than removing the temptation from view and occupying their attention with a song, game or chat. Waiting is a skill that develops, not a fixed trait.
What it means for professionals
The study supports teaching attention strategies in work on impulsivity, including with ADHD. When citing the marshmallow test's "predictive power", rely on modern replications.

References
  • Mischel, W., & Ebbesen, E. B. (1970). Attention in delay of gratification. Journal of Personality and Social Psychology, 16(2), 329–337. https://doi.org/10.1037/h0029815
  • Mischel, W., Shoda, Y., & Rodriguez, M. L. (1989). Delay of gratification in children. Science, 244(4907), 933–938. https://doi.org/10.1126/science.2658056
  • Shoda, Y., Mischel, W., & Peake, P. K. (1990). Predicting adolescent cognitive and self-regulatory competencies from preschool delay of gratification: Identifying diagnostic conditions. Developmental Psychology, 26(6), 978–986. https://doi.org/10.1037/0012-1649.26.6.978
  • Watts, T. W., Duncan, G. J., & Quan, H. (2018). Revisiting the marshmallow test: A conceptual replication investigating links between early delay of gratification and later outcomes. Psychological Science, 29(7), 1159–1177. https://doi.org/10.1177/0956797618761661
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