The brain contains many distinct functional and anatomical regions. Despite these differences, brain tissues are sufficiently uniform in the fact that they can engage in various types of processing. How can functionally different kinds of processes, such as verbal memory and reasoning, visual and auditory memory, and mental imagery, all be supported by the relatively uniform electrochemical activity of a brain's neurons? How are they appropriately segregated and integrated as needed? In Aging, Representation, and Thought, Matthew J. Sharps provides an empirically based, functional...