Relationship between N1 evoked potential morphology and the perception of voicing.
Relationship between N1 evoked potential morphology and the perception of voicing.
复制标题
N1 诱发电位形态与发声感知之间的关系。
DOI：
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发表时间：
2000
影响因子：
2.4
通讯作者：
M. Dorman
中科院分区：
文献类型：
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作者：
Anu Sharma;Catherine M. Marsh;M. Dorman
听觉诱发电位（AEP）相关的神经表征的刺激沿着a /ga/-/ka/和a /ba/-/pa/连续检查，以确定是否语音启动时间（VOT）相关的变化，在N1起始反应从一个单一的双峰分量是一个可靠的指标的感知浊音和清音。从十个科目的行为识别结果显示，平均类别边界的/ga/-/ka/连续体的VOT为46毫秒，在/ba/-/pa/连续体的VOT为27.5毫秒。在相同的受试者中，电生理记录显示，一个单一的N1组件被视为与30 ms及以下的刺激，和两个组件（N1'和N1）被视为与40 ms及以上的刺激，两个连续的VOT。也就是说，N1形态的变化（从单峰到双峰）与/ba/-/pa/连续统刺激从有声到无声的感知变化相吻合，但与/ga/-/ka/连续统刺激不一致。这项研究的结果表明，N1形态不能可靠地预测语音识别的刺激不同的VOT。这些研究结果还表明，先前报道的出现“双峰”的起始反应，从听觉皮层的总记录并不表明皮质相关的感知的无意义。
Auditory evoked potential (AEP) correlates of the neural representation of stimuli along a /ga/-/ka/ and a /ba/-/pa/ continuum were examined to determine whether the voice-onset time (VOT)-related change in the N1 onset response from a single to double-peaked component is a reliable indicator of the perception of voiced and voiceless sounds. Behavioral identification results from ten subjects revealed a mean category boundary at a VOT of 46 ms for the /ga/-/ka/ continuum and at a VOT of 27.5 ms for the /ba/-/pa/ continuum. In the same subjects, electrophysiologic recordings revealed that a single N1 component was seen for stimuli with VOTs of 30 ms and less, and two components (N1' and N1) were seen for stimuli with VOTs of 40 ms and more for both continua. That is, the change in N1 morphology (from single to double-peaked) coincided with the change in perception from voiced to voiceless for stimuli from the /ba/-/pa/ continuum, but not for stimuli from the /ga/-/ka/ continuum. The results of this study show that N1 morphology does not reliably predict phonetic identification of stimuli varying in VOT. These findings also suggest that the previously reported appearance of a "double-peak" onset response in aggregate recordings from the auditory cortex does not indicate a cortical correlate of the perception of voicelessness.