期刊
CLINICAL NEUROPHYSIOLOGY
卷 112, 期 4, 页码 565-582出版社
ELSEVIER SCI IRELAND LTD
DOI: 10.1016/S1388-2457(00)00545-9
关键词
electrocorticography; gamma; induced rhythms; event-related desynchronization; auditory cortex; speech perception
资金
- NIDCD NIH HHS [R29-DC03081] Funding Source: Medline
- NINDS NIH HHS [NS29973, K08 NS01821, NS26553] Funding Source: Medline
Objective: To define the spatial, temporal, and functional characteristics of induced gamma (>30 Hz) activity during functional activation of the left superior temporal gyrus. Methods: Electrocorticographic (ECoG) recordings were made in 4 clinical subjects during auditory tone and phoneme discrimination tasks, and event-related changes in the ECoG band power were calculated. The topography and temporal sequence of event-related power changes in different gamma bands were contrasted with those of auditory evoked potentials (AEPs), and with those of event-related power changes in the alpha band (8-12 Hz). Results: Auditory stimuli induced a broadband power augmentation that included 40 Hz, as well as higher (80-100 Hz) gamma frequencies. The topography of gamma augmentation was similar, but not identical, to that of the AEP, and was more focused than that of alpha power suppression. Its temporal onset coincided with the N100. but outlasted it. Phonemes produced greater gamma augmentation than tones, while a similar difference was not observed in the N100. Conclusions: Auditory perception induces ECoG gamma activity not only at 40 Hz, but also in higher gamma frequencies. This activity appears to be an index of cortical activation that reflects task-specific processing in the human auditory cortex more closely than the AEP or alpha power suppression. (C) 2001 Elsevier Science Ireland Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据