Carla was testing the "A,not B" error with her son,Alex.Carla put a ball under a blue blanket several times,and Alex searched for the ball under the blue blanket.Then Carla put the ball under the yellow blanket,and Alex looked at the yellow blanket but again reached under the blue blanket.This suggests that Alex

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This behavior is indicative of the "A, not B" error, where a child knows the correct location of an object but still reaches for the location where the object was previously found. This suggests a developmental stage where the child struggles with executive function, particularly inhibitory control, rather than a lack of object permanence or a simple preference.

Carla Was Testing the "A,not B" Error with Her Son,Alex