Hickok Gregory, Pickell Herbert, Klima Edward, Bellugi Ursula
Department of Cognitive Sciences, University of California, Irvine, CA 92697, USA.
Neuropsychologia. 2009 Jan;47(2):382-7. doi: 10.1016/j.neuropsychologia.2008.09.009. Epub 2008 Sep 19.
We examine the hemispheric organization for the production of two classes of ASL signs, lexical signs and classifier signs. Previous work has found strong left hemisphere dominance for the production of lexical signs, but several authors have speculated that classifier signs may involve the right hemisphere to a greater degree because they can represent spatial information in a topographic, non-categorical manner. Twenty-one unilaterally brain damaged signers (13 left hemisphere damaged, 8 right hemisphere damaged) were presented with a story narration task designed to elicit both lexical and classifier signs. Relative frequencies of the two types of errors were tabulated. Left hemisphere damaged signers produced significantly more lexical errors than did right hemisphere damaged signers, whereas the reverse pattern held for classifier signs. Our findings argue for different patterns of hemispheric asymmetry for these two classes of ASL signs. We suggest that the requirement to encode analogue spatial information in the production of classifier signs results in the increased involvement of the right hemisphere systems.
我们研究了用于生成两类美国手语手势（词汇手势和分类手势）的半球组织。先前的研究发现，在生成词汇手势方面存在强烈的左半球优势，但几位作者推测，分类手势可能在更大程度上涉及右半球，因为它们可以以拓扑的、非分类的方式表示空间信息。我们让21名单侧脑损伤的手语者（13名左半球损伤，8名右半球损伤）完成一项故事叙述任务，旨在引出词汇手势和分类手势。将这两种错误类型的相对频率制成表格。左半球损伤的手语者产生的词汇错误明显多于右半球损伤的手语者，而在分类手势方面则呈现相反的模式。我们的研究结果表明，这两类美国手语手势存在不同的半球不对称模式。我们认为，在生成分类手势时对模拟空间信息进行编码的要求导致右半球系统的参与增加。
