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首页> 外文期刊>Journal of Neuroscience Methods >Method for detection of changes in the EEG induced by the presence of sensory stimuli.
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Method for detection of changes in the EEG induced by the presence of sensory stimuli.

机译:检测由感觉刺激引起的脑电图变化的方法。

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摘要

The onset and offset of sensory stimuli evoke transient changes in the electroencephalogram (EEG) that can be detected by linear and/or nonlinear analysis. However, there is presently no systematic procedure to quantify the brain-electrical-activity correlate of the presence of a stimulus (as opposed to its onset evoked potential). We describe a method for detecting a stimulus-related change in brain electrical activity that persists while the stimulus is present (presence effect). The method, which is based on phase-space embedding of the EEG time series followed by quantitative analysis of the recurrence plot of the embedded signal, was used to demonstrate the occurrence of a presence effect in separate groups of human subjects exposed to sound, a magnetic field, and light. Any form of law-governed dynamical activity induced in the EEG can be detected, particularly activity that is nonlinearly related to the stimulus. Salient mathematical features of the method were reproduced in a model EEG system containing known nonlinear determinism.
机译:感觉刺激的发生和偏移会引起脑电图(EEG)的瞬时变化,该变化可通过线性和/或非线性分析来检测。但是,目前尚没有一种系统的程序来量化刺激存在(与它的诱发电位相反)的脑电活动相关性。我们描述了一种检测与刺激有关的大脑电活动的变化的方法,该变化在存在刺激时持续存在(临场感)。该方法基于脑电图时间序列的相空间嵌入,然后对嵌入信号的重复图进行定量分析,该方法用于证明在暴露于声音,磁场和光。可以检测到在脑电图中诱发的任何形式的法律动态活动,特别是与刺激非线性相关的活动。该方法的重要数学特征在包含已知非线性确定性的模型EEG系统中得以再现。

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