Pettit, John M.

The exact nature of ipsilateral auditory pathway suppression under dichotic stimulation remains controversial. To help resolve this controversy, the distinctive feature confusions (blend vs nonblend errors) made on a dichotic listening CV test by two hemispherectomees were analyzed. Results support ipsilateral auditory pathway suppression under dichotic CV stimulation. Ipsilateral auditory pathway suppression is discussed in terms of stimulus specificity, subject, and task difference.

This study compared the hemispheric dominance for language of three groups of 6- to 9-year-olds (10 language-disordered, 10 articulation-disordered, and 10 normal children). Two dichotic listening tests (digits and animal names) were administered. Statistical analysis revealed a left hemisphere dominance for the control and articulation-disordered groups but no significant hemisphere differences for the language-disordered group. The results support the hypothesis that the language-disordered child has an unlateralized cerebral dominance for language, while the articulation-disordered child has normal left cerebral hemisphere dominance for language. Furthermore, there is some evidence to suggest that the language-disordered child does not process auditory stimuli in the left hemisphere as efficiently as the articulation-disordered or normal child. These results also suggest the importance of developing strategies in the management of these disorders.