Rightward shift of the auditory subjective straight ahead in right- and left-handed subjects
Rightward shift of the auditory subjective straight ahead in right- and left-handed subjects
复制标题
DOI：
10.1016/j.neuropsychologia.2006.05.027
复制
发表时间：
2007-01-01
期刊：
影响因子：
2.6
通讯作者：
Candas, V.
中科院分区：
文献类型：
--
作者：
Dufour, A.;Touzalin, P.;Candas, V.
虽然空间不对称性已被广泛研究的视觉方式，并在较小程度上在触觉方式，有听觉空间不对称性的神经正常的科目没有报告。本研究中的受试者执行了一项听觉中线任务，其中他们必须调整在不同半球空间中同时呈现的两种声音的水平，以便使感知到的融合声音看起来来自中矢状面。结果显示，当声音向左偏侧时，受试者报告声音是中央的（即，在左耳更强烈），就好像在感知的位置上有一个巨大的移动。尽管所有的受试者都必须用双手来调节音量，但这种频率偏移在左撇子受试者中比在右撇子受试者中更为明显。注视方向显著调节感知听觉中线的移位：当受试者的注视方向是中央和向右30度时，听觉中线的移位最大，而当注视方向是向左侧30度时，听觉中线的移位消失。这些结果进行了比较，从忽视患者在以前的研究中获得的数据，并讨论在听觉空间任务的不对称半球激活和注意力的不对称分配之间的相互作用的左，右半球。(c)2006爱思唯尔有限公司保留所有权利。
While spatial asymmetries have been extensively investigated in the visual modality and to a lesser degree in the tactile modality, there are no reports on auditory spatial asymmetries in neurologically normal subjects. The subjects in this study performed an auditory midline task in which they had to adjust the level of two sounds that were presented simultaneously in different hemispaces so as to make the perceived fused sound appear to emanate from the midsagittal plane. The results showed that subjects reported a sound to be central when it was lateralized to the left (i.e., more intense at the left ear), as if there were a rightward shift in the perceived location. This rightward shift was more pronounced in left-handed than in right-handed subjects, even though all the subjects had to use both hands to adjust the sound level. Gaze direction significantly modulated the shift of the perceived auditory midline: the rightward shift was maximal when the subjects' gaze direction was central and 30 degrees to the right, while it disappeared when the gaze was directed 30 degrees to the left side. These results are compared with data obtained from neglect patients in previous studies and are discussed in terms of the interaction between asymmetrical hemispheric activations in auditory spatial tasks and an asymmetrical allocation of attention between the left and right hemispaces. (c) 2006 Elsevier Ltd. All rights reserved.