Jean Piaget Observes That at 1 Year and 2 Months

Essay

Jean Piaget observes that at 1 year and 2 months, his daughter Jacqueline holds in her hands an object which is new to her: a round, flat box which she turns all over, shakes, and rubs against the bassinet. She lets it go and tries to pick it up. But she only succeeds in touching it with her index finger, without grasping it. She nevertheless tries and presses on the edge. The box then tilts up and falls again. Jacqueline shows an interest in this result and studies the fallen box. Which of Piaget's six substages of sensorimotor development does this behavior reflect?