Simos P G, Diehl R L, Breier J I, Molis M R, Zouridakis G, Papanicolaou A C
Department of Neurosurgery, The University of Texas-Houston Medical School, 6431 Fannin Suite 7.148, Houston, 77030, TX, USA.
Brain Res Cogn Brain Res. 1998 Oct;7(2):215-9. doi: 10.1016/s0926-6410(98)00037-8.
Event-related magnetic fields (ERFs) were recorded from the left hemisphere in nine normal volunteers in response to four consonant-vowel (CV) syllables varying in voice-onset time (VOT). CVs with VOT values of 0 and +20 ms were perceived as /ga/ and those with VOT values of +40 and +60 ms as /ka/. Results showed: (1) a displacement of the N1m peak equivalent current dipole toward more medial locations; and (2) an abrupt reduction in peak magnetic flux strength, as VOT values increased from +20 to +40 ms. No systematic differences were noted between the 0 and +20 ms stimuli or between the +40 and +60 ms CVs. The findings are in agreement with the results of multiunit invasive recordings in non-human primates regarding the spatial and temporal pattern of neuronal population responses in the human auditory cortex which could serve as neural cues for the perception of voicing contrasts.
在9名正常志愿者中，记录了左半球对四个在声门起始时间（VOT）上不同的辅音-元音（CV）音节的事件相关磁场（ERF）。VOT值为0和+20毫秒的CV被感知为/ga/，而VOT值为+40和+60毫秒的CV被感知为/ka/。结果显示：（1）N1m峰值等效电流偶极向更内侧位置的位移；（2）随着VOT值从+20毫秒增加到+40毫秒，峰值磁通量强度急剧降低。在0和+20毫秒的刺激之间或+40和+60毫秒的CV之间未发现系统差异。这些发现与非人类灵长类动物的多单位侵入性记录结果一致，涉及人类听觉皮层中神经元群体反应的空间和时间模式，可以作为语音对比感知的神经线索。
