Baum S R
School of Communication Sciences and Disorders, McGill University, Montreal, Quebec, Canada.
Brain Lang. 2001 Mar;76(3):266-81. doi: 10.1006/brln.2000.2386.
Two experiments examined the influence of context on stop-consonant voicing identification in fluent and nonfluent aphasic patients and normal controls. Listeners were required to label the initial stop in a target word varying along a voice onset time (VOT) continuum as either voiced or voiceless ([b]/[p] or [d]/[t]). Target stimuli were presented in sentence contexts in which the rate of speech of the sentence context (Experiment 1) or the semantic bias of the context (Experiment 2) was manipulated. The results revealed that all subject groups were sensitive to the contextual influences, although the extent of the context effects varied somewhat across groups and across experiments. In addition, a number of patients in both the fluent and nonfluent aphasic groups could not consistently identify even endpoint stimuli, confirming phonetic categorization impairments previously shown in such individuals. Results are discussed with respect to the potential reliance by aphasic patients on higher level context to compensate for phonetic perception deficits.
两项实验研究了语境对流利型和非流利型失语症患者以及正常对照组中塞音浊音识别的影响。要求听众将目标词中沿语音起始时间（VOT）连续体变化的初始塞音标记为浊音或清音（[b]/[p]或[d]/[t]）。目标刺激呈现于句子语境中，其中句子语境的语速（实验1）或语境的语义偏向（实验2）受到操控。结果显示，所有受试组都对语境影响敏感，尽管语境效应的程度在不同组和不同实验中略有差异。此外，流利型和非流利型失语症组中的一些患者甚至无法始终如一地识别端点刺激，证实了此前在此类个体中显示的语音分类损伤。针对失语症患者可能依赖更高层次的语境来弥补语音感知缺陷这一点对结果进行了讨论。
