Westerhausen René, Woerner Wolfgang, Kreuder Frank, Schweiger Elisabeth, Hugdahl Kenneth, Wittling Werner
Center for Neuropsychological Research, University of Trier, Trier, Germany.
Neuropsychology. 2006 May;20(3):272-9. doi: 10.1037/0894-4105.20.3.272.
The objective of the present study was to examine the role of the corpus callosum (CC) in dichotic listening. For this purpose, 40 right-handed healthy male participants were assessed with morphological and diffusion tensor imaging, which yielded macrostructural (midsagittal area) and microstructural (mean diffusion, fractional anisotropy) measures of the total CC and predefined subregions. Applying the standard consonant-vowel Bergen Dichotic Listening Test (including 3 different attentional instructions), the authors found dichotic listening performance to be substantially related to the integrity of the CC at both macro- and microstructural levels. Results indicate a dual role of the CC; it is relevant not only for the stimulus-driven (bottom-up) transfer of left-ear input to the left hemisphere but also for its attentional (top-down) modulation.
本研究的目的是检验胼胝体（CC）在双耳分听中的作用。为此，对40名右利手健康男性参与者进行了形态学和扩散张量成像评估，得出了总CC及预定义子区域的宏观结构（矢状面中部面积）和微观结构（平均扩散率、分数各向异性）测量值。应用标准的辅音-元音卑尔根双耳分听测试（包括3种不同的注意力指示），作者发现双耳分听表现与CC在宏观和微观结构层面的完整性密切相关。结果表明CC具有双重作用；它不仅与左耳输入到左半球的刺激驱动（自下而上）传递有关，还与其注意力（自上而下）调节有关。
