A classic study on this
Development of the Ability to Use Recall to Guide Action, as Indicated by Infants' Performance on AB
Adele D. Diamond · 1985 · Child Development
- Children
- About 25 babies
- Where
- Boston, United States
- Ages
- 6 to 12 months
- How
- Researchers tested the same babies every 2 weeks as they grew
- What it found
- Babies first uncovered a toy they had watched being hidden at about 7½ months on average, all between 6½ and 8½ months. Girls tended to start a little earlier than boys.
- Limits
- A small group of mostly well-off families in one city. Read from a scanned copy, so the figures need checking against a clean copy.