easy · MCAT psych-soc

A 10-month-old infant watches as a researcher hides a ball under a red blanket. The infant successfully retrieves the ball. However, when the ball is then hidden under a nearby blue blanket in plain sight, the infant still searches under the red blanket.

This 'A-not-B error' is characteristic of which stage?

  1. Formal Operational
  2. Sensorimotor
  3. Preoperational
  4. Concrete Operational

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