The dynamic concept of the reticulum is very useful in helping to understand drive development and its relationship to relational development, as was seen in the previous chapter. The characteristics of the P-I dynamics are even more interesting, however, as they permit a thorough analysis of Edelman/Tononi's hypotheses about neuronal selection in cerebral mapping, and suggest other more complete explanations of how maternal interaction can modify the child's brain. The widely held belief that mother-child relations necessarily produce cerebral changes (Schore, 1994; Hadley, 1989) has a plausible explanation in the effects that maternal patterns can have on the development of the "s-o" pathways of the reticulum, as will now be illustrated.