Abstract
The regional cerebral blood flow (rCBF) of nine healthy male subjects (dextrals) was used as an index of local neuronal activity to measure the effects of repeated monaural verbal stimulation in 32 hemispheric cortical locations. In contrast to more complex mental activations, processing and analysis of verbal auditory stimuli did not result in significant increases from the resting flow level. Differences were, however, obtained when the rCBF of homologous regions of the two hemispheres were compared. A significant blood flow asymmetry with higher flows in the left hemisphere was found in a temporoparietal location during left-as well as right-ear-stimulation measurements. In addition, significantly higher flows were found in a frontotemporal area of the right hemisphere but only during left-ear stimulation. These results were interpreted as a participation of the posterior language area of the left hemisphere in verbal processes regardless of the laterality of the stimulus input and as a possible indication of cross-hemispheric transfer of a partially processed verbal material from a right frontotemporal region.
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