Sysoeva Olga V, Lange Elke B, Sorokin Alexander B, Campbell Tom
MEG Center, Moscow State University of Psychology and Education, Russia; Autism Research Laboratory, Moscow State University of Psychology and Education, Russia.
Cognitive Brain Research Unit, Institute of Behavioral Sciences, University of Helsinki, Finland.
Int J Psychophysiol. 2015 Mar;95(3):310-21. doi: 10.1016/j.ijpsycho.2014.12.007. Epub 2014 Dec 16.
Visual search and oddball paradigms were combined to investigate memory for to-be-ignored color changes in a group of 12 healthy participants. The onset of unexpected color change of an irrelevant stimulus evoked two reliable ERP effects: a component of the event-related potential (ERP), similar to the visual mismatch negativity response (vMMN), with a latency of 120-160 ms and a posterior distribution over the left hemisphere and Late Fronto-Central Negativity (LFCN) with a latency of 320-400 ms, apparent at fronto-central electrodes and some posterior sites. Color change of that irrelevant stimulus also slowed identification of a visual target, indicating distraction. The amplitude of this color-change vMMN, but not LFCN, indexed this distraction effect. That is, electrophysiological and behavioral measures were correlated. The interval between visual scenes approximated 1s (611-1629 ms), indicating that the brain's sensory memory for the color of the preceding visual scenes must persist for at least 600 ms. Therefore, in the case of the neural code for color, durable memory representations are formed in an obligatory manner.
视觉搜索和Oddball范式相结合，以研究12名健康参与者对被忽略颜色变化的记忆。无关刺激的意外颜色变化引发了两种可靠的ERP效应：一种事件相关电位（ERP）成分，类似于视觉失配负波反应（vMMN），潜伏期为120 - 160毫秒，在左半球有后部分布；以及晚期额中央负波（LFCN），潜伏期为320 - 400毫秒，在额中央电极和一些后部位置明显。该无关刺激的颜色变化也减缓了视觉目标的识别，表明存在干扰。这种颜色变化vMMN的幅度而非LFCN为这种干扰效应提供了指标。也就是说，电生理和行为测量是相关的。视觉场景之间的间隔约为1秒（611 - 1629毫秒）表明，大脑对先前视觉场景颜色的感觉记忆必须至少持续600毫秒。因此，就颜色的神经编码而言，持久的记忆表征是以一种必然的方式形成的。
