How the brain integrates affective and propositional language into a unified behavioral function. Hypothesis based on clinicoanatomic evidence
E. D. Ross, J. H. Harney, C. deLacoste-Utamsing and P. D. Purdy
Recent publications suggest that the right hemisphere dominates in
modulating the affective components of language. Disorders of language form
right-sided focal brain lesions have been called "aprosodias" and can be
classified in a manner similar to the aphasias. We describe a patient with
motor aprosodia who subsequently died and underwent neuropathologic
examination. From the neuropathologic findings and recent observations
concerning the neurology of depression, we hypothesize that the motor
integration of propositional and affective language takes place in the
brainstem, whereas their higher-order integration takes place via the
callosal connections between Wernicke's area on the left and its homologue
on the right. Direct application of these functional and anatomic relations
can help clinicians to properly interpret the often incongruous and
disparate behavioral and language responses encountered in brain-damaged
patients.
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