Answer :
Eight-month-old Jerome is in the stage of cognitive development. Thus, when his mother shows Jerome a ball and then hides it behind her back, we would expect him to look for the ball.
The baby Jerome is in the first stage of cognitive development which is called Sensorimotor stage. It is a period in which a child starts to learn about their environment. A child tries to experience the world through his or her senses or motor movements.
Sensorimotor stage is one of the four stages of cognitive development theory of Piaget. He calls this stage as sensorimotor because in this stage infants try to gain basic understanding of the world around them using their senses and motor skills.
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