| Summary: | There is an important hemispheric distinction in the functional organization of prefrontal cortex (PFC) that has not been fully recognized and explored. Research with split-brain patients provides considerable evidence for a left hemisphere interpreter that abhors indeterminacy and automatically draws inferences to complete patterns (real or imaginary). It is suggested that this interpreter function may be a byproduct of the linguistic capabilities of the left hemisphere. This same literature initially limited the role of the right hemisphere to little more than visual organization. Recent reviews have garnered evidence for several different roles for the right prefrontal cortex in reasoning, problem solving, and decision-making. We here focus on the beneficial but neglected role of indeterminacy in real-world problem solving and argue that the right PFC complements the left PFC interpreter by maintaining, and even enhancing indeterminacy. Successful real-world functioning is a delicate balancing act between these two systems.
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