The correlation dimension: A useful objective measure of the transient visual evoked potential?
The correlation dimension: A useful objective measure of the transient visual evoked potential?
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DOI：
10.1167/8.1.6
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发表时间：
2008-01-01
影响因子：
1.8
通讯作者：
Dain, Stephen J.
中科院分区：
文献类型：
--
作者：
Boon, Mei Ying;Henry, Bruce I.;Dain, Stephen J.
视觉诱发电位(VEP)可以通过检查其成分的形态来分析，例如负(N)峰和正(P)峰。然而，依赖于成分识别的方法在处理复杂和可变的形态响应时可能不可靠；因此，客观方法也是有用的。视觉诱发电位的一个潜在有用的衡量标准是关联维度。它与视觉系统的相关性是通过检测其在一系列颜色对比(42%，两倍于心理物理阈值的心理物理阈值)和视觉非诱发反应(零对比)下应用于瞬时VEP时的行为来研究的。进行了非线性度测试(例如，替代测试)。相关维度被发现与刺激属性(彩色对比度)和已知的线性测量(傅立叶导出的VEP幅度)呈负相关。它还被发现与对刺激的可见性和知觉有关，以至于对于大多数参与者来说，维度在心理物理阈值时达到了最大值。后者提示，关联维度可作为估计心理物理阈值的有用诊断参数，并可用于有或无相关疾病过程的先天性和获得性色觉缺陷的客观筛查和监测。
Visual evoked potentials (VEPs) may be analyzed by examination of the morphology of their components, such as negative (N) and positive (P) peaks. However, methods that rely on component identification may be unreliable when dealing with responses of complex and variable morphology; therefore, objective methods are also useful. One potentially useful measure of the VEP is the correlation dimension. Its relevance to the visual system was investigated by examining its behavior when applied to the transient VEP in response to a range of chromatic contrasts (42%, two times psychophysical threshold, at psychophysical threshold) and to the visually unevoked response (zero contrast). Tests of nonlinearity (e. g., surrogate testing) were conducted. The correlation dimension was found to be negatively correlated with a stimulus property (chromatic contrast) and a known linear measure (the Fourier-derived VEP amplitude). It was also found to be related to visibility and perception of the stimulus such that the dimension reached a maximum for most of the participants at psychophysical threshold. The latter suggests that the correlation dimension may be useful as a diagnostic parameter to estimate psychophysical threshold and may find application in the objective screening and monitoring of congenital and acquired color vision deficiencies, with or without associated disease processes.