Human Growth and Development / Unit 3 HGD 0353 short lesson, about 20 seconds
The A-Not-B Error
Captions available
The idea
In the A-not-B error, an infant who has repeatedly found a toy at A keeps searching there after watching it hidden at B.
In practice
A toy moved in plain view, and the infant reaching back to the old spot.
Where people slip
By seven and a half months infants pass if the delay is under two seconds for reaching, or fifteen for looking.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
Builds on
Unlocks
- Nothing yet depends on this.
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