时间知觉和关联负变化

Time Perception and Contingent Negative Variation

关联负变化（contingent negative variation，CNV）被认为是与时间知觉过程有关的ERP成份。有关研究发现，CNV波幅会随着时间知觉到的长度和时间知觉的准确性而发生变化；CNV波幅的潜伏期与时间比较的判断决策过程有关；时间知觉中所诱发的CNV的脑内源存在历时性激活的特点且存在半球效应。为了进一步揭示时间知觉的神经机制，还需要结合具有高空间分辨率的脑成像技术和神经心理学的研究。

This review examined the relationship Contingent Negative Variation (CNV) and time perception in millisecond-to-second range. Drawn from the ERPs studies on time perception， the conclusions were: the CNV amplitude was an index of temporal accumulator and accuracy; the CNV peak was an index of time-based decision making; and CNV time course differentiated the roles of the hemispheres during time processing. Finally， we suggested that the future research should further dissociate the “true” components of time perception from CNV.