First unit that allows us to understand the world and be social. Baby able to adapt to determine what is relevant and what is not. Universal citizen: don"t maintain it but not at a loss, speeds up our communication and language ability. Perception of phonemes decline after second year of life. Phonology, and others, brocas, non fluent aphasia: does not maintain syntactical structure. Left hemi: process grammar such as phonology, morph, syntax, comprehension and production. Right: pragmatics: discourse cohesion, anaphora (rhetorical term, repeating a word or phrase at beginning of a verse) There are activation differences in adults and child. Pars opercularis: active in both adult and child. These structures are found posterior or anterior to inferior frontal gyrus of broca"s area. Fine recruitment, child requires refined recruitment but once adult language levels reached, falls off. Better appreciation of rules and nuance of language. After age 4, increased complexity in communication and comprehension and appreciation of it.