High frequency oscillations in early cortical somatosensory evoked potentials
High frequency oscillations in early cortical somatosensory evoked potentials
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DOI：
10.1016/s0168-5597(98)00032-x
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发表时间：
1998-11-01
期刊：
影响因子：
--
通讯作者：
Hashimoto, I
中科院分区：
文献类型：
--
作者：
Ozaki, I;Suzuki, C;Hashimoto, I
Objective: To evaluate the characteristics of high frequency (HF) components of the early cortical somatosensory evoked potentials (SEPs).Methods: We recorded 8-channel SEPs from the frontal and left centro-parietal scalp after right median nerve stimulation with a wide band-pass (0.5-2000 Hz) and digitized at 40 kHz sampling rate in 12 healthy subjects. KF components were analyzed after digital bandpass filtering (300-1000 Hz). The power spectrum was obtained by a maximum entropy method.Results: HF oscillations (maximum power at 600-800 Hz) consisting of 5 to 8 peaks were discriminated from the preceding P14 far-field in all cases and their phases were reversed between the frontal and contralateral parietal regions. In addition, in subjects with a high amplitude central P22 potential in original wide-band recordings, a single HF oscillation with a maximum at the central region was present. Furthermore, this component showed no phase reversal over the centro-parietal area.Conclusion: We therefore conclude that HF oscillations are superimposed not only on the tangential N20-P20 but on the radial P22 potential, and are generated from both tangential (area 3b) and radial (area 1) current sources. (C) 1998 Elsevier Science Ireland Ltd. All rights reserved.
