Sanjit hides an interesting object in a certain place several times, and his 10-month-old niece finds it. But, when she watches Sanjit hide it in second place, she looks in the first location. This is called an A-not-B error.
The A-Not-B error sometimes referred to as a perseverative error, is a mistake in how young children perceive things they observe mentally. An illustration of a typical A-side concealment event from a task study of the classic A-not-B mistake. The constant image is made up of the box and the hiding places.
This behavior can be seen in bigger spatial setups that call for diversions and reaching tasks.
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