قسم بياجيه المرحلة الحسية إلى ستة مراحل فرعية.. Sub-Stage Age Description 1 Simple Reflexes: Birth-6 weeks "Coordination of sensation and action through reflexive behaviors". Three primary reflexes are described by Piaget: sucking of objects in the mouth, following moving or interesting objects with the eyes, and closing of the hand when an object makes ...