Dichotic listening after cerebral hemispherectomy: Methodological and theoretical observations

被引:21
作者
de Bode, Stella
Sininger, Yvonne
Healy, Eric W.
Mathern, Gary W.
Zaidel, Eran
机构
[1] Univ S Carolina, Dept Commun Sci & Disorders, Arnold Sch Publ Hlth, Columbia, SC 29208 USA
[2] Univ Calif Los Angeles, Div Neurosurg, David Geffen Sch Med, Los Angeles, CA USA
[3] Univ Calif Los Angeles, Mental Retardat Res Ctr, David Geffen Sch Med, Los Angeles, CA USA
[4] Univ Calif Los Angeles, Div Head & Neck Surg, David Geffen Sch Med, Los Angeles, CA USA
[5] Univ Calif Los Angeles, Div Head & Neck Surg, David Geffen Sch Med, Los Angeles, CA USA
[6] Univ Calif Los Angeles, Brain Res Inst, Los Angeles, CA 90024 USA
[7] Univ Calif Los Angeles, Dept Psychol, Los Angeles, CA 90024 USA
关键词
dichotic listening; laterality indices; hemispherectomy; ipsilateral suppression;
D O I
10.1016/j.neuropsychologia.2007.03.026
中图分类号
B84 [心理学]; C [社会科学总论]; Q98 [人类学];
学科分类号
03 ; 0303 ; 030303 ; 04 ; 0402 ;
摘要
We examined two commonly used dichotic listening tests for measuring the degree of hemispheric specialization for language in individuals who had undergone cerebral hemispherectomy: the consonant-vowel (CV) nonsense syllables and the fused words (FW) tests, using the common laterality indices f and lambda Hemispherectomy on either side resulted in a massive contralateral ear advantage, demonstrating nearly complete ipsilateral Suppression of the left ear in the right hemispherectomy group but slightly less complete suppression of the right ear in the left hemispherectomy group. The results are consistent with the anatomical model of the ear advantage [Kimura, D. (196 1). Most syllables or words are reported for the ear contralateral to the remaining hemisphere, while few or none are reported for the ear ipsilateral to the remaining hemisphere. In the presence of competing inputs to the two ears, the stronger contralateral ear-hemisphere connection dominates/suppresses the weaker ipsilateral ear-hemisphere connection. The; index was similar in the two tests but the index f was higher in the CV than the FW test. Both indices of the CV test were sensitive to side of resection, higher in the right hemispherectomy than in the left hemispherectomy groups. Published by Elsevier Ltd.
引用
收藏
页码:2461 / 2466
页数:6
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