The functional neuroanatomy of metrical stress evaluation of perceived and imagined spoken words
The functional neuroanatomy of metrical stress evaluation of perceived and imagined spoken words
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DOI：
10.1093/cercor/bhh124
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发表时间：
2005-02-01
期刊：
影响因子：
3.7
通讯作者：
Kahn, RS
中科院分区：
文献类型：
--
作者：
Aleman, A;Formisano, E;Kahn, RS
我们假设，颞叶中与口语语音处理有关的区域也会在想象语音的生成和语音处理过程中被激活。我们测试了这一假设，使用功能性磁共振成像在行为控制任务的测量压力评估。受试者呈现双音节词，并确定强弱音节的交替。因此，他们被要求区分弱首词和强首词。在一种情况下，刺激被呈现给受试者（通过耳机）。在另一种情况下，刺激物被视觉呈现在屏幕上，受试者被要求想象听到这个词。结果表明，激活的辅助运动区，额下回（布罗卡区）和颞叶在这两种情况下。在上级颞回（STG）和上级颞沟（STS）的强烈激活期间观察到的听觉（知觉）的条件。然而，位于STS/STG后部的区域在成像条件下也有反应。在控制条件下，也涉及视觉呈现的单词的处理，但需要从受试者的语义决定，没有观察到STS的同一区域的激活。我们认为，测量应力的处理，有或没有听觉输入，部分依赖于皮质界面系统位于后部的STS/STG。这些结果证实了行为证据的语音回路参与的词汇-言语意象。
We hypothesized that areas in the temporal lobe that have been implicated in the phonological processing of spoken words would also be activated during the generation and phonological processing of imagined speech. We tested this hypothesis using functional magnetic resonance imaging during a behaviorally controlled task of metrical stress evaluation. Subjects were presented with bisyllabic words and had to determine the alternation of strong and weak syllables. Thus, they were required to discriminate between weak-initial words and strong-initial words. In one condition, the stimuli were presented auditorily to the subjects (by headphones). In the other condition the stimuli were presented visually on a screen and subjects were asked to imagine hearing the word. Results showed activation of the supplementary motor area, inferior frontal gyrus (Broca's area) and insula in both conditions. In the superior temporal gyrus (STG) and in the superior temporal sulcus (STS) strong activation was observed during the auditory (perceptual) condition. However, a region located in the posterior part of the STS/STG also responded during the imagery condition. No activation of this same region of the STS was observed during a control condition which also involved processing of visually presented words, but which required a semantic decision from the subject. We suggest that processing of metrical stress, with or without auditory input, relies in part on cortical interface systems located in the posterior part of STS/STG. These results corroborate behavioral evidence regarding phonological loop involvement in auditory-verbal imagery.