顶下叶在汉语声调感知中的作用：fNIRS导航的TMS研究
fNIRS-guided TMS technique reveals a critical role of the left inferior parietal lobule in Chinese tone perception
刘淑娟 1谭丽柔 1齐芸 1胡帅 1王小娟 1杨剑峰1
作者信息
摘要
左侧顶下叶(IPL)是语音范畴感知的重要脑区，它同样参与了汉语声调感知，但是对 其功能认识还没有得到一致的结论。本研究使用功能性近红外光谱(fNIRS)技术对左侧 IPL 参与声调感知进行功能定位(实验一)，然后使用经颅磁刺激(TMS)技术对左侧IPL进行虚拟 损伤(实验二)，建立左侧IPL与声调范畴感知的因果联系。实验一发现左侧IPL背侧通道不 仅对声调范畴敏感，范畴间比范畴内刺激对诱发了更强的氧合血红蛋白(HbO)浓度变化；还 对声学间隔敏感，小声学间隔比大声学间隔刺激对诱发了更强的HbO浓度变化。实验二分 别虚拟损伤左侧IPL的背侧和腹侧通道，发现当左侧IPL背侧通道虚拟受损后，该通道对声 调范畴的敏感性消失，而左侧IPL腹侧通道和前运动皮层通道对声学特征变得敏感。但是当 左侧IPL腹侧通道虚拟受损后，仅左侧额下回通道出现了功能代偿性地对声调范畴敏感。结 果表明左侧 IPL 背侧在汉语声调范畴感知中起到重要作用，而腹侧区域在语音感知的神经 生理模型背侧通路中起着门控作用。研究结果从声调语言的角度丰富了语音感知加工的神 经生理模型，阐明了背侧/腹侧语音加工通路在范畴感知中的协作机制。
Abstract
The left inferior parietal lobe (IPL) is a critical brain region for categorical perception of speech, and some studies have shown that it is involved in the categorical perception of Chinese tones. However, its specific role in tone perception remains unclear. The current study manipulated both tonal categories (intercategory vs. intracategory) and acoustic features (large vs. small acoustic intervals) in successively presented stimulus pairs to examine whether the IPL is sensitive to acoustic features or to the abstract representation of tonal categories during Chinese tone perception. Experiment 1 used functional near-infrared spectroscopy (fNIRS) to localize functional activation in the IPL during tone perception. Experiment 2 used transcranial magnetic stimulation (TMS) to virtually impair the IPL and establish a causal neural link between the IPL and tonal categorical perception. Experiment 1 showed that the dorsal IPL channel was sensitive to tonal categories, exhibiting more robust IPL activation induced by intercategory stimulation than intracategory stimulation. This region was also sensitive to acoustic intervals, with stronger activation induced by small acoustic intervals than by large ones. In Experiment 2, the dorsal and ventral IPL channels were virtually disrupted separately using TMS. When the dorsal IPL channel was inhibited, its sensitivity to tonal categories disappeared. In contrast, the ventral IPL channel and the left premotor cortex (PMC) channel were sensitive to acoustic intervals, with stronger activation induced by large acoustic intervals than by small ones. However, when TMS inhibited the ventral IPL channel, only functional compensation in the left inferior frontal gyrus channels showed sensitivity to tonal categories and induced greater intercategory activation than intracategory stimulation did. In summary, these findings demonstrate a critical role of the left dorsal IPL in the categorical perception of Chinese tone. In contrast, the ventral IPL plays an essential gating role in the dorsal stream of speech perception. The results enrich the neurophysiological model of speech perception from a tonal language perspective, elucidating the collaborative mechanism between dorsal and ventral speech streams in categorical perception.关键词
语音范畴知觉/声调/顶下叶/fNIRS/TMSKey words
speech category/tone/inferior parietal lobule/fNIRS/TMS引用本文复制引用
刘淑娟,谭丽柔,齐芸,胡帅,王小娟,杨剑峰.顶下叶在汉语声调感知中的作用：fNIRS导航的TMS研究[EB/OL].(2026-02-06)[2026-02-08].https://chinaxiv.org/abs/202602.00116.学科分类
语言学/汉语/汉藏语系
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