Hemispheric lateralization of bilaterally presented homologous visual and auditory stimuli in normal adults, normal children, and children with central auditory dysfunction.
Two experiments were conducted to examine the performance of normal adults, normal children, and children diagnosed with central auditory dysfunction presumed to involve the interhemispheric pathways on a dichotic digits test in common clinical use for the diagnosis of central auditory processing disorder (CAPD) and its corresponding visual analog. Results of the first experiment revealed a significant right ear advantage (REA) for the dichotic listening task and a left-visual-field advantage (LVFA) for the corresponding visual analog in normal adults and children. In the second experiment, results revealed a significantly larger REA in the children with CAPD as compared to the normal children. Results also revealed a reversed cerebral asymmetry (RVFA) for the children with CAPD on the visual task. Significant cross-modal correlations suggest that the two tasks may reflect, at least in part, similar interhemispheric processing mechanisms in children. Findings are discussed in relation to differential diagnosis and modality-specificity of CAPD.
Bellis
Teri James
TJ
Department of Communication Disorders, 414 East Clark Street, The University of South Dakota, Vermillion, SD 57069, USA. tbellis@usd.edu
Billiet
Cassie
C
Ross
Jody
J
D000161:Acoustic Stimulation; D000293:Adolescent; D000328:Adult; D000704:Analysis of Variance; D001304:Auditory Diseases, Central / Q000503:physiopathology*; D001306:Auditory Pathways / Q000502:physiology*; D016022:Case-Control Studies; D002648:Child; D003337:Corpus Callosum / Q000502:physiology* / Q000503:physiopathology; D004007:Dichotic Listening Tests; D004192:Discrimination, Psychological / Q000502:physiology; D005260:Female; D007839:Functional Laterality / Q000502:physiology*; D006801:Humans; D008297:Male; D010775:Photic Stimulation; D000091402:Prohibitins; D011930:Reaction Time / Q000502:physiology; D012016:Reference Values; D014794:Visual Fields / Q000502:physiology*