This chapter reviews neuropsychological evidence concerning representational processes and dual coding theory. The evidence is provided by studies of functional differences between the two cerebral hemispheres and different regions within each hemisphere as inferred from performance on tasks that implicate verbal and nonverbal processes in different degrees. The theoretical emphasis is on observations that bear on the verbal-nonverbal symbolic distinction, the more specific sensorimotor systems of which the symbolic systems are comprised, and the different levels of processing within and between systems. Evidence relevant to specific functional distinctions, such as sequential as compared to synchronous or parallel processing, is also considered.
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