Temporal stability of high-frequency brain oscillations in the human EEG
Temporal stability of high-frequency brain oscillations in the human EEG
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DOI：
10.1023/b:brat.0000006334.15919.2c
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发表时间：
2003-12-01
期刊：
影响因子：
2.7
通讯作者：
Müller, MM
中科院分区：
文献类型：
--
作者：
Keil, A;Stolarova, M;Müller, MM
在个体参与者中给定测量的时间稳定性是心理生理测量的理想属性。本研究的目的是检查在人类脑电图（EEG）的高频振荡活动的可靠性在4个会话。卷积的EEG时间序列与Morlet小波产生的时间-频率表示的信号为每个会话。稳定性的地形和时间过程中的伽玛波段活动（GBA）的两名参与者进行了基于功能的选择性注意力任务，在四个单独的会议，以每周为间隔。我们发现高的时间稳定性的非锁相GBA通常发生在200和500毫秒之间的时间范围内呈现的刺激，无论是在地形和时间过程。早期锁相GBA（80-120毫秒）表现出较高的变异性相对于地形，但在时间过程中是一致的。我们的结论是，在认知神经科学中使用的高频振荡活动的措施，满足稳定性的要求，有意义的解释这个参数的脑功能。
Temporal stability of a given measurement within individual participants is a desirable property of psychophysiological measures. The present study aims to examine the reliability of high-frequency oscillatory activity in the human electroencephalogram (EEG) across 4 sessions. Convolution of the EEG time series with Morlet wavelets yielded time-frequency representations of the signal for each session. Stability of both topography and time course of gamma-band activity (GBA) was determined for two participants performing a feature-based selective attention task in four separate sessions, spaced at weekly intervals. We found high temporal stability of non-phase-locked GBA typically occurring in time ranges between 200 and 500 ms following presentation of a stimulus, both in terms of topography and time course. Early phase-locked GBA (80-120 ms) showed higher variability with respect to topography, but was consistent in terms of time course. We conclude that measures of high-frequency oscillatory activity as used in the cognitive neurosciences meet stability requirements necessary for meaningful interpretation of this parameter of brain function.