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Department of Psychology, University of Tulsa, Oklahoma.
In an effort to objectify neuropsychologic evaluations, consideration of a patient's emotional behavior has often been neglected. An extensive literature review is undertaken in an effort to document lateralized emotional behaviors commonly found in brain injury populations. This evidence is contrasted with the psychiatric symptoms and lateralized neuropsychologic impairments seen in major depression and schizophrenia. A theoretical model is then proposed that attempts to integrate these "functional" vs. "organic" symptoms based upon reciprocal inhibition of lateralized emotional functioning in brain injury and psychiatric disorders. This opponent process model not only seems to account for some of the discrepant findings in the literature, but additionally provides a cogent and useful marker to neurophychologically differentiate "neuronal" vs. "metabolic" disorders. The model further suggests new ways of envisioning treatment and recovery from both psychiatric illness and brain injury.
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