Baby Jimmy's parent places a brand new rattle in his crib.Instantly, Jimmy picks up the rattle, tries to mouth the rattle, and notices that when it shakes, it makes noise.Jimmy immediately tries shaking the rattle different ways to see how the sound changes, and he seems to enjoy this activity.Piaget would say that this is an example of

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This behavior is an example of Substage 3: Secondary circular reactions, according to Piaget's stages of cognitive development. In this stage, infants become more focused on the world and begin to intentionally repeat an action in order to trigger a response in the environment, such as shaking a rattle to hear the sound it makes.

Baby Jimmy's Parent Places a Brand New Rattle in His