前庭电刺激对视觉运动启动后反应干扰的影响

文献信息

中文摘要

背景： 对无根据运动反应进行反向调节的一个令人印象深刻的例证来自运动点刺激的反应启动：如果参与者先看到与静态箭头目标方向相反运动的点，相比相同方向运动的点，他们对箭头方向的反应更快（即负相容效应，NCE）。这种NCE发生在刺激起始异步性（SOA）大于200毫秒时；当SOA小于200毫秒时，则出现正相容效应（PCE）。本研究旨在探讨前庭系统在NCE中的参与。方法：应用右侧阳极/左侧阴极（R-GVS）或左侧阳极/右侧阴极（L-GVS）刺激或无刺激的前庭电刺激（GVS）。我们预期GVS对PCE无影响，而R-GVS与L-GVS对NCE有不同影响。结果：结果在很大程度上证实了这些预期。在短SOA条件（147毫秒）下，PCE的发生独立于GVS。相反，在较长SOA条件（360毫秒）下的NCE受到前庭刺激的影响：R-GVS存在显著的NCE，而L-GVS以及无前庭刺激时效应不显著。结论：这显著地证明了前庭系统对反应调节过程的重要影响，正如反应启动所反映的那样。

英文摘要

One impressive demonstration of a counter-regulation of unfounded motor responses comes from response priming with moving dot stimuli: Participants respond faster to the direction of static arrow targets if they are preceded by dots moving in the opposite compared to the same direction (i.e., negative compatibility effect, NCE). This NCE occurs with stimulus onset asynchronies (SOAs) above 200 ms; with SOAs below 200 ms, a positive compatibility effect (PCE) occurs. The current research aimed to investigate the involvement of the vestibular system in the NCE. Galvanic vestibular stimulation (GVS) with either right-anodal/left-cathodal (R-GVS) or left-anodal/right-cathodal (L-GVS) stimulation or no stimulation was applied. We expected no influence of GVS on the PCE, and differential influences on the NCE of R-GVS vs. L-GVS. The results largely confirmed these expectations. In a short SOA condition (147 ms), PCEs occurred independent of GVS. In contrast, the NCE in the longer SOA condition (360 ms) was influenced by vestibular stimulation: There was a significant NCE with R-GVS, but non-significant effects with L-GVS as well as with no vestibular stimulation. This strikingly demonstrated the important influence of the vestibular system for response regulation processes as reflected in response priming.