Yet, neo-Piagetian theories differ in the original theory in their concept of stage-by-stage transition. Rather than blindly accepting Piaget's stages as absolute truth, much of modern neo-Piagetian theories posit differences within the stages. These new changes to Piaget's stages were aimed primarily at exploring the intra-individual and inter-individual evolutions within the growing cognitive mind of the child. In addition to these changes, neo-Piagetian theory also suggests that development along all lines of stage-by-stage transgression occurs primarily because of an increasing working capacity, where the child is slowly becoming more and more capable of larger memory storages and therefore recalls. With more in the child's memory bank, they are able to process stimuli around them more efficiently.

Piaget has long been known for his theories on egocentric-speech and the role of internalizing language within the progression of the...

According to Piaget, children speak primarily to and about themselves when they are younger. They are expressing their speech primarily to their own ears in order to internalize the external processes going on around them. Eventually, this inner speech is harnassed and perfected enough where they can comfortably use it within a social context, allowing for an internalization of external processes along with proper social interaction regarding the nature of those processes. Within the context of autistic children, however, Piagetian theory would suggest that there was a disconnect within the adaptation of egocentric speech into its ore complex social counterpart. The individual child has mastered egocentric speech, yet they fail to move forward in the progression of development towards a much more social being.
References

Karpov. Yuriy. (2005). The Neo-Vygotskiam Approach to Child Development. Cambridge University.