A classic study on this
Addition and subtraction by human infants
Karen Wynn · 1992 · Nature
- Children
- Not given in the summary we read
- Where
- Not given in the summary we read
- Ages
- 5 months
- How
- Researchers measured how long babies looked at puppet shows
- What it found
- Babies of 5 months looked longer when one puppet plus one more seemed to make one, as if they expected two.
- Limits
- We have only read the summary. Other studies couldn't always repeat it.