Teramoto Wataru, Watanabe Hiroshi, Umemura Hiroyuki
Institute for Human Science and Biomedical Engineering, National Institute of Advanced industrial Science and Technology, 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan.
Perception. 2008;37(11):1649-66. doi: 10.1068/p5692.
The perceived temporal order of external successive events does not always follow their physical temporal order. We examined the contribution of self-motion mechanisms in the perception of temporal order in the auditory modality. We measured perceptual biases in the judgment of the temporal order of two short sounds presented successively, while participants experienced visually induced self-motion (yaw-axis circular vection) elicited by viewing long-lasting large-field visual motion. In experiment 1, a pair of white-noise patterns was presented to participants at various stimulus-onset asynchronies through headphones, while they experienced visually induced self-motion. Perceived temporal order of auditory events was modulated by the direction of the visual motion (or self-motion). Specifically, the sound presented to the ear in the direction opposite to the visual motion (ie heading direction) was perceived prior to the sound presented to the ear in the same direction. Experiments 2A and 2B were designed to reduce the contributions of decisional and/or response processes. In experiment 2A, the directional cueing of the background (left or right) and the response dimension (high pitch or low pitch) were not spatially associated. In experiment 2B, participants were additionally asked to report which of the two sounds was perceived 'second'. Almost the same results as in experiment 1 were observed, suggesting that the change in temporal order of auditory events during large-field visual motion reflects a change in perceptual processing. Experiment 3 showed that the biases in the temporal-order judgments of auditory events were caused by concurrent actual self-motion with a rotatory chair. In experiment 4, using a small display, we showed that 'pure' long exposure to visual motion without the sensation of self-motion was not responsible for this phenomenon. These results are consistent with previous studies reporting a change in the perceived temporal order of visual or tactile events depending on the direction of self-motion. Hence, large-field induced (ie optic flow) self-motion can affect the temporal order of successive external events across various modalities.
外部连续事件的感知时间顺序并不总是遵循其物理时间顺序。我们研究了自我运动机制在听觉模态时间顺序感知中的作用。我们测量了在连续呈现两个短声音的时间顺序判断中的感知偏差,同时参与者体验由观看长时间大视野视觉运动引发的视觉诱发自我运动(偏航轴圆周运动)。在实验1中,通过耳机以不同的刺激起始异步向参与者呈现一对白噪声模式,同时他们体验视觉诱发自我运动。听觉事件的感知时间顺序受到视觉运动(或自我运动)方向的调节。具体而言,与视觉运动(即前进方向)相反方向传入耳朵的声音比同一方向传入耳朵的声音被感知为先出现。实验2A和2B旨在减少决策和/或反应过程的影响。在实验2A中,背景(左或右)的方向提示和反应维度(高音或低音)在空间上不相关联。在实验2B中,还要求参与者报告两个声音中哪个被感知为“第二个”。观察到与实验1几乎相同的结果,表明大视野视觉运动期间听觉事件时间顺序的变化反映了感知处理的变化。实验3表明,听觉事件时间顺序判断中的偏差是由旋转椅的同时实际自我运动引起的。在实验4中,我们使用小显示器表明,没有自我运动感觉的“纯粹”长时间视觉运动暴露不是造成这种现象的原因。这些结果与先前的研究一致,这些研究报告了视觉或触觉事件的感知时间顺序根据自我运动方向而变化。因此,大视野诱发(即光流)的自我运动可以影响跨各种模态的连续外部事件的时间顺序。