Ontheonehandismaturation,whichdependsdirectlyonthedevelopmentofthenervoussystem;ontheotherhandislearning,whichitselfis also adevelopmenta
This idea reminds me of Lawrence Kohlberg's stages of moral development, which is actually based on Piaget's work.
All his ideas started from the research he performed with very young children as his subjects. He found out that children are faced with different moral issues, and their judgments on whether they are to act positively or negatively over each dilemma are heavily influenced by several factors. These factors also effect learning.