Reversal-rate dependent differences in the EEG gamma-band during multistable visual perception
Reversal-rate dependent differences in the EEG gamma-band during multistable visual perception
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DOI：
10.1016/s0167-8760(00)00168-9
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发表时间：
2000-12-01
影响因子：
3
通讯作者：
Stadler, M
中科院分区：
文献类型：
--
作者：
Strüber, D;Basar-Eroglu, C;Stadler, M
这是一个经常报告的观察文献中的多稳态知觉的逆转率在一个给定的观察时间是受一个高的个体间变异性。最近，我们报道了额叶伽玛波段增强多稳态视觉感知。本研究的目的是调查是否在伽马波段的变化对应的逆转率的变化。因此，在400 s观察期内，根据基于表观运动的可逆模式的逆转率，将总共25名观察者分为两个亚组。在400-s内逆转超过40次的受试者被定义为高速率转换者（HRS）。逆转率低于40次转换的受试者被定义为低速率转换者（LRS）。EEG记录从额叶，中央，顶叶，枕叶位置的两个半球。结果表明，HRS在锁相和非锁相振荡中的γ活性显著更高。两个亚组均显示额叶位置的伽马振幅最高。研究结果支持注意自上而下加工参与图形反转的观点。得出的结论是，较高的伽玛活动的HRS反映了较高的觉醒，警觉性和/或注意力的状态，根据其快速逆转率。(C)2000爱思唯尔科技有限公司。保留所有权利。
It is an often reported observation in the literature on multistable perception that the reversal rate within a given observation time is subject to a high interindividual variability. Recently, we reported frontal gamma-band enhancement during multistable visual perception. The aim of the present study was to investigate whether changes in the gamma-band correspond to the variability of the reversal rate. Therefore, a total of 25 observers were divided into two subgroups according to their reversal rate during a 400-s observation period of a reversible pattern based on apparent motion. Subjects with more than 40 reversals within the 400-s were defined as high-rate switchers (HRS). Subjects with a reversal rate below 40 switches were defined as low-rate switchers (LRS). EEG was recorded from frontal, central, parietal, and occipital locations of both hemispheres. The results showed significantly higher gamma activity for the HRS in both phase-locked and non-phase-locked oscillations. Both subgroups showed the highest gamma amplitudes at frontal locations. The results support the involvement of attentional top-down processing in figure reversal. It is concluded that the higher gamma activity for the HRS reflects states of higher arousal, alertness and/or attention according to their fast reversal rate. (C) 2000 Elsevier Science B.V. All rights reserved.