Macar F, Besson M
Biol Psychol. 1985 Dec;21(4):293-307. doi: 10.1016/0301-0511(85)90184-x.
The contingent Negative Variation (CNV) was compared in four paradigms inducing distinct processes. All paradigms comprised empty intervals of 4 sec bounded by two 100 msec stimuli (S1 and S2) or by S1 and the response (a button press). In paradigm ID (Intensity Discrimination), the S1-S2 interval was followed, after another delay, by a choice response depending on the intensity of S2. In paradigm RT (Reaction Time), the S1-S2 interval was followed by a simple reaction time. In paradigm TP (Time Production), the subjects had to produce a response 4 sec after S1. In paradigm TR (Time Reproduction), the duration of the S1-S2 interval was estimated by the subjects and was to be reproduced after S2. Electrodes were placed on Cz, Fz and Pz in 12 human subjects. The largest CNVs were obtained in paradigm TR. Motor preparation before S2 had no effect on CNV amplitude. Discussion focuses upon the relations between CNV, temporal processes and activation.
在四种引发不同过程的范式中对伴随负变化（CNV）进行了比较。所有范式都包含由两个100毫秒刺激（S1和S2）或由S1和反应（按键）界定的4秒空时间间隔。在范式ID（强度辨别）中，S1 - S2间隔之后，经过另一段延迟，会根据S2的强度做出选择反应。在范式RT（反应时间）中，S1 - S2间隔之后是简单反应时间。在范式TP（时间产生）中，受试者必须在S1之后4秒做出反应。在范式TR（时间再现）中，S1 - S2间隔的持续时间由受试者估计，并在S2之后进行再现。在12名人类受试者的Cz、Fz和Pz放置了电极。在范式TR中获得了最大的CNV。S2之前的运动准备对CNV幅度没有影响。讨论集中在CNV、时间过程和激活之间的关系上。
