Chota Samson, McLelland Douglas, Lavergne Louisa, Zimmermann Eckart, Cavanagh Patrick, VanRullen Rufin
CerCo, Université de Toulouse Paul Sabatier, CNRS, Toulouse, France.
Université de Paris, Laboratoire Vision Action Cognition EA7326, Paris, France.
Front Neurosci. 2020 Mar 17;14:217. doi: 10.3389/fnins.2020.00217. eCollection 2020.
We generally experience a stable visual world in spite of regular disruptions caused by our own movements (saccades, blinks) or by the visual input itself (flashes, occlusions). In trying to understand the mechanisms responsible for this stability, saccades have been particularly well-studied, and a number of peri-saccadic perceptual distortions (spatial and temporal compression, failure to detect target displacement) have been explored. It has been shown that some of these distortions are not saccade specific, but also arise when the visual input is instead abruptly and briefly masked. Here, we demonstrate that another peri-saccadic distortion, the reversal of the temporal order of a pair of brief events, may also be found with masking. Human participants performed a temporal order judgment task, and the timing of stimuli and mask was varied over trials. Perceptual order was reversed on ~25% of the trials at the shortest stimulus to mask intervals. This was not merely a failure of target detection, since participants often reported these reversals with high subjective confidence. These findings update the constraints on models of stability around disruptions.
尽管我们自身的运动（扫视、眨眼）或视觉输入本身（闪光、遮挡）会造成规律性干扰，但我们通常体验到的是一个稳定的视觉世界。在试图理解造成这种稳定性的机制时，扫视受到了特别深入的研究，并且已经探究了一些扫视周围的感知扭曲（空间和时间压缩、未能检测到目标位移）。研究表明，其中一些扭曲并非扫视所特有，当视觉输入被突然且短暂地遮挡时也会出现。在此，我们证明，另一种扫视周围的扭曲，即一对短暂事件的时间顺序反转，在遮挡情况下也可能出现。人类参与者执行了一项时间顺序判断任务，并且在不同试验中改变了刺激和遮挡的时间安排。在最短的刺激到遮挡间隔下，约25%的试验中感知顺序发生了反转。这不仅仅是目标检测失败，因为参与者常常以高度的主观置信度报告这些反转。这些发现更新了关于干扰周围稳定性模型的限制条件。
