WHAT IS the process of myelination and lateralization and their effects on development during this period?

The period in question is pertaining to a child's play years. Myelination is a condition in which myelin forms around nerve cells allowing difficult thought processes to be transmitted. It is especially important during the teen years. Lateralization refers to localizing of functions to the brain, as far as left and right. A child's intellectual direction during adolescence forms predominately through these two processes.