We should never underestimate the role of spoken and written language in early child development. Psychological tools allow us to close the gap between lower and higher mental functions. These include various systems for counting, mnemonic techniques, algebraic symbol systems, works of are, writing, schemes, diagrams, maps, and technical drawings, conventional signs, etc. The parent says yes or no to the small child. The child internalizes this, later understanding right or yes from wrong or no .
Culture is the basic orientation, which structures behavioral environment of the self.
A child must be able to appraise their own performance according to what is socially acceptable for them, to voluntarily control their own actions. What a child learns will depend on the psychological tools available to them. Each culture has a different set of tools available to them. What a child thinks, does, and experiences depend on their culture. The central fact about our psychology is the fact of mediation.