Quantification and rejection of ocular artifacts in auditory evoked fields in schizophrenics

T. Meier , T. Rosburg , M. Arnold , I. Kreitschmann-Andermahr , H. Sauer , H. Nowak , H. Witte
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引用次数: 24

Abstract

Results: In a magnetoencephalographic investigation of the auditory evoked field (AEF) in 17 schizophrenics and 17 controls, 37% of the schizophrenics and 12% of the controls showed eye artifacts in every second trial or even more frequently. In the uncorrected average fields, the ratio between the power of artifacts and the power of the magnetoencephalogram (MEG) exceeded the value of 0.1 for 48% of the schizophrenics and for 29% of the controls. Ocular artifacts biased the locations of equivalent current dipoles of the M100 component towards deeper positions. A regression algorithm for the correction of ocular artifacts in raw data and an identification technique of ocular artifacts based on the topography of transmission coefficients is described.

Conclusions: A linear dependence of ocular artifacts in AEF on the electrooculogram (EOG) was confirmed. Possible errors introduced by the correction are discussed. Transmission coefficients should be calculated for several individual trials with the same type of artifact. Errors due to evoked potentials in the EOG were found to be comparable in amplitude to noise in the AEF. Examples of transmission coefficients from the EOG to the MEG are given.

精神分裂症患者听觉诱发场中眼伪影的量化和排斥
结果:对17名精神分裂症患者和17名对照组的听觉诱发场(AEF)进行了脑磁图调查,其中37%的精神分裂症患者和12%的对照组每隔一秒甚至更频繁地出现眼伪影。在未校正的平均视场中,48%的精神分裂症患者和29%的对照组的伪影功率与脑磁图(MEG)功率之比超过0.1。眼伪影使M100分量的等效电流偶极子的位置偏向更深的位置。介绍了一种原始数据眼伪影校正的回归算法和一种基于透射系数地形的眼伪影识别技术。结论:AEF的眼伪影与眼电图(EOG)呈线性关系。讨论了修正可能带来的误差。透射系数应计算几个单独的试验与相同类型的人工制品。EOG中诱发电位引起的误差在振幅上与AEF中的噪声相当。给出了从眼电图到脑电图传输系数的例子。
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