Piaget believed that are schemes reflecting an infant's repetition of interesting or enjoyable actions that focus on the infant's own body. An example of this might be an infant putting its thumb in its mouth and sucking.

Primary circular reactions.

Explanation: Primary circular reactions according to Piaget involve activities which makes the infant focused on its own body, while secondary circular reactions involve activities where the infant's actions relate to the outside world, and are both enjoyable, and repeated.