<Li> an early numerical cognition, that is, an ability to represent number and even compute the outcomes of addition and subtraction operations; </Li> <Li> an ability to infer the goals of people in their environment; </Li> <Li> an ability to engage in simple causal reasoning . </Li> <P> There are critical periods in infancy and childhood during which development of certain perceptual, sensorimotor, social and language systems depends crucially on environmental stimulation . Feral children such as Genie, deprived of adequate stimulation, fail to acquire important skills and are unable to learn in later childhood . The concept of critical periods is also well - established in neurophysiology, from the work of Hubel and Wiesel among others . </P>

Who came up with psychosocial moral and cognitive stages of development