In every aspect of sensorimotor intelligence, the brain and the senses interact with experiences, each shaping the other. Sensation, perception, and cognition cycle in what Piaget called circular reactions. The first two stages of sensorimotor intelligence involve primary circular reactions, which involve the infant’s own body.Stage one, called the stage of reflexes, lasts only for a month. It includes senses as well as motor reflexes, the foundations of infant thought. Reflexes become deliberate; sensation leads to perception and then to cognition. Sensorimotor intelligence begins.As reflexes adjust, the 1-month-old enters stage two, first acquired adaptations (also called the stage of first habits). Adaptation is cognitive; it includes both assimilation and accommodation, which people use to understand their experience. Infants adapt their reflexes as repeated responses provide information about what the body does and how that action feels.