de Bode Stella, Sininger Yvonne, Healy Eric W, Mathern Gary W, Zaidel Eran
Department of Communication Sciences and Disorders, Arnold School of Public Health, University of South Carolina, Columbia, SC 29208, USA.
Neuropsychologia. 2007 Jun 18;45(11):2461-6. doi: 10.1016/j.neuropsychologia.2007.03.026. Epub 2007 Apr 8.
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. (1961). 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 lambda 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.
我们使用常见的偏侧性指数f和λ，对两种常用的双耳分听测试进行了研究，以测量接受过大脑半球切除术的个体语言半球特化程度：辅音-元音（CV）无意义音节测试和融合词（FW）测试。任何一侧的半球切除术都会导致明显的对侧耳优势，在右半球切除术组中，几乎完全抑制了左耳的同侧反应，但在左半球切除术组中，对右耳的抑制略不完全。这些结果与耳优势的解剖学模型一致[木村，D.（1961年）]。大多数音节或单词是对剩余半球对侧的耳朵报告的，而对剩余半球同侧的耳朵报告很少或没有。在双耳存在竞争性输入的情况下，较强的对侧耳-半球连接会主导/抑制较弱的同侧耳-半球连接。λ指数在两项测试中相似，但CV测试中的指数f高于FW测试。CV测试的两个指数对切除侧敏感，在右半球切除术组中高于左半球切除术组。
