Visual field asymmetries for motion processing in deaf and hearing signers
Visual field asymmetries for motion processing in deaf and hearing signers
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DOI：
10.1006/brcg.2001.1498
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发表时间：
2002-06-01
影响因子：
2.5
通讯作者：
Dobkins, KR
中科院分区：
文献类型：
--
作者：
Bosworth, RG;Dobkins, KR
最近，我们报道了聋人手语者在运动处理方面具有较强的右视野/左半球优势，而听力不识别者则表现出轻微的反向不对称(Bosworth&Dobkins，1999)。聋人手语者的这种视野不对称可能是由于听觉剥夺或使用视觉-手册语言造成的。美国手语(ASL)。以便将这两个可能的来源分开。在这项研究中，我们增加了第三个群体，听力正常的本地手语者，他们的听力正常，并从他们的聋人父母那里学习了ASL。就像我们宝贵的书房一样。受试者在视野中的不同位置执行运动方向辨别任务。除了调查不同受试者左右视野不对称性的差异外，我们还询问了上级视野和下级视野以及外周视野和中央视野的表现是否存在差异。重复我们之前的研究，在聋人手语者中观察到了强大的右视野优势，但在听力正常的人中没有观察到。与聋人手语者一样，听障手语者也表现出较强的右视野优势。这表明这种影响与使用手语的经验有关。这些结果表明，习得和理解语言所需的知觉过程(在ASL的情况下是运动处理)是由左脑招募的，语言占主导地位的半球。失聪受试者也表现出比听力组中的任何一组明显更大的劣势视野优势。此外，失聪受试者在外周刺激上的表现有相对好于中枢刺激的趋势，而两组听力受试者的表现则相反。由于聋人手语者在这些领域不同于前听者和非听觉者，在聋人受试者中观察到的下部和外围视野优势可能与听觉剥夺有关。最后，对于任何受试者组，这些视野不对称性都不受注意力的影响。这表明它们是感官因素的结果，而不是注意力因素。(C)2002年埃尔塞维尔科学公司(美国)。
Recently we reported a strong right visual field/left hemisphere advantage for motion processing in deaf signers and a slight reverse asymmetry in hearing nonsigners (Bosworth & Dobkins, 1999). This visual field asymmetry in deaf signers may be due to auditory deprivation or to experience with a visual-manual language. American Sign Language (ASL). In order to separate these two possible sources. in this studs we added a third group, hearing native signers, who hake normal hearing and have learned ASL from their deaf parents. As in our precious study. subjects performed a direction-of-motion discrimination task at different locations across the visual field. In addition to investigating differences in left vs right visual field asymmetries across subject groups, we also asked whether performance differences exist for superior vs inferior visual fields and peripheral vs central visual fields. Replicating our previous study, a robust right visual field advantage was observed in deaf signers, but not in hearing nonsigners. Like deaf signers, hearing signers also exhibited a strong right visual field advantage. suggesting that this effect is related to experience with sign language. These results suggest that perceptual processes required for the acquisition and comprehension of language (motion processing in the case of ASL) are recruited by the left, language-dominant, hemisphere. Deaf subjects also exhibited an inferior visual field advantage that was significantly larger than that observed in either hearing group. In addition, there was a trend for deaf subjects to perform relatively better on peripheral than on central stimuli, while both hearing groups showed the reverse pattern. Because deaf signers differed front hearing signers and nonsigners along these domains, the inferior and peripheral visual field advantages observed in deaf subjects is presumably related to auditory deprivation. Finally, these visual field asymmetries were not modulated by attention for any subject group. suggesting them are a result of sensory, and not attentional, factors. (C) 2002 Elsevier Science (USA).