Greg Duncan
Greg Duncan is a researcher and co-author of the 2018 Psychological Science paper reporting a conceptual replication of the marshmallow test follow-up.
Who they are
The work of Greg Duncan reaches this site through the paper listed below. On this site the name is tied to Marshmallow Test, Conceptual Replication.
Key papers
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. What it reports: A conceptual replication with children whose mothers had not completed college. An extra minute waited at age 4 went with a small gain in achievement at age 15, about half the size of the original associations and reduced by two thirds once family background, early cognitive ability and the home environment were counted.
Key ideas
Marshmallow Test: A waiting task in which a child is offered one treat now or a larger one after a wait, used to study how children manage delay.
Conceptual Replication: A new study that tests the same idea with a different sample or design and not an identical procedure.
Sources
- 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.