Lots of stuff about humans uniquely vocalizing on exhalation. Infants babble a lot because it is easy for them to do. Chapter ends with claim language started with Homo habilis. Unsubstatiated at this point except for brain size arguments. Lots of stuff on prefrontal function mapping and various effects of prefrontal damage.
Some forms impact viewpoint switching.
Symbols are distributed, references are patterns of virtual links. The role of the prefrontal cortex is the construction of the distributed symbolic architecture. This chapter investigates where language is located in the brain. There is a lot of physiological data, PET scans, et cetera and descriptions of different regions. Language processing is distributed hierarchically outward from motor control areas associated with phoneme recognition.