Shore David I, Barnes Morgan E, Spence Charles
Department of Psychology, Neuroscience & Behaviour, McMaster University, 1280 Main Street West, Hamilton, Ont., Canada L8S 4K1.
Neurosci Lett. 2006 Jan 9;392(1-2):96-100. doi: 10.1016/j.neulet.2005.09.001. Epub 2005 Oct 6.
We report an experiment designed to investigate the temporal dynamics of the visuotactile crossmodal congruency effect. Vibrotactile targets were presented randomly to the index finger (top side of a hand-held cube) or thumb (bottom side) of either hand while visual distractors were presented randomly from one of the same four possible locations. The stimulus onset asynchrony (SOA) between the vibrotactile target and the visual distractor was varied on a trial-by-trial basis. Participants made speeded discrimination responses regarding the elevation of the vibrotactile targets (i.e., upper versus lower) while trying to ignore the visual distractors. The largest crossmodal congruency effects (defined as the difference in performance between incongruent and congruent elevation distractor trials) were obtained when the visual distractor preceded the vibrotactile target by 50-100 ms, although significant effects were also reported when the distractor followed the target by as much as 100 ms. These results are discussed in terms of the conjoint influence of response competition, crossmodal perceptual interactions (i.e., the ventriloquism effect), and exogenous spatial attention on the crossmodal congruency effect. The distinct temporal signatures of each of these effects are also highlighted.
我们报告了一项旨在研究视觉触觉跨通道一致性效应的时间动态的实验。振动触觉目标随机呈现于任一只手的食指（手持立方体的顶面）或拇指（底面），同时视觉干扰物从相同的四个可能位置之一随机呈现。振动触觉目标与视觉干扰物之间的刺激起始异步性（SOA）在每次试验中变化。参与者对振动触觉目标的高度（即上方与下方）进行快速辨别反应，同时试图忽略视觉干扰物。当视觉干扰物比振动触觉目标提前50 - 100毫秒呈现时，获得了最大的跨通道一致性效应（定义为不一致和一致高度干扰物试验之间的表现差异），尽管当干扰物跟随目标多达100毫秒时也报告了显著效应。根据反应竞争、跨通道感知相互作用（即口技效应）和外源性空间注意对跨通道一致性效应的联合影响对这些结果进行了讨论。还强调了这些效应各自独特的时间特征。
