Functional heterogeneity of inferior frontal gyrus is shaped by linguistic experience
Functional heterogeneity of inferior frontal gyrus is shaped by linguistic experience
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DOI：
10.1006/brln.2000.2382
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发表时间：
2001-03-01
影响因子：
2.5
通讯作者：
Hutchins, GD
中科院分区：
文献类型：
--
作者：
Hsieh, L;Gandour, J;Hutchins, GD
通过跨语言的正电子发射断层扫描（PET）研究，确定语言经验对音段（辅音和元音）和超音段（音调）信息感知的影响。中文和英文受试者（每组10人）以双耳方式呈现由5个中文单音节语素（语音）或相同刺激的低通过过滤版本（非语音）组成的列表。第一项和最后一项是有针对性的比较：目标音调之间的时间间隔充满了不相关的干扰音调。快速反应、选择性注意范式要求被试在忽略干扰性干扰音的情况下对目标项目做出辨别判断。对五项任务进行两次PET扫描：一项被动听音高（非言语），四项主动听（言语=辅音）。冯埃尔，和语气；Nonspeech = pitch)。与被动倾听相比，主动任务组平均图像的比较发现了显著的血行区域变化。在四项任务中，中国受试者的左运动前皮层、包部和三角部的活动增加。另一方面，英语受试者仅在元音任务中表现出左侧额下回区域的活动增加，在音调任务中表现出右侧额下回区域的活动增加。研究结果表明，参与语言感知的功能回路依赖于语言经验。所有由韵律线索发出的语言信息都与左半球机制有关。与语音加工有关的工作记忆的存储和执行过程是在左额叶的离散区域进行调节的。(C) 2001学术出版社。
A crosslinguistic, positron emission tomography (PET) study was conducted to determine the influence of linguistic experience on the perception of segmental (consonants and vowels) and suprasegmental (tones) information. Chinese and English subjects (10 per group) were presented binaurally with lists consisting of five Chinese monosyllabic morphemes (speech) or low-pass-filtered versions of the same stimuli (nonspeech). The first and last items were targeted for comparison: the time interval between target tones was filled with irrelevant dis tractor tones. A speeded-response, selective attention paradigm required subjects to make discrimination judgments of the target items while ignoring intervening distractor tones. PET scans were acquired for five tasks presented twice: one passive listening to pitch (nonspeech) and four active (speech = consonant. von el, and tone; nonspeech = pitch). Significant regional changes in blood Row were identified from comparisons of group-averaged images of active tasks relative to passive listening. Chinese subjects show increased activity in left premotor cortex, pars opercularis, and pars triangularis across the four tasks. English subjects, on the other hand, show increased activity in left inferior frontal gyrus regions only in the vowel task and in right inferior frontal gyrus regions in the pitch task. Findings suggest that functional circuits engaged in speech perception depend on Linguistic experience. All linguistic information signaled by prosodic cues engages left-hemisphere mechanisms. Storage and executive processes of workings memory that are implicated in phonological processing are mediated in discrete regions of the left frontal lobe. (C) 2001 Academic Press.