Department of Biomedical Engineering, Ulsan National Institute of Science and Technology, Ulsan, 44919, South Korea.
Department of Brain & Cognitive Sciences and Center for Visual Science, University of Rochester, Rochester, NY, 14627, USA.
Psychon Bull Rev. 2023 Apr;30(2):564-574. doi: 10.3758/s13423-022-02181-2. Epub 2022 Sep 26.
Despite the fundamental importance of visual motion processing, our understanding of how the brain represents basic aspects of motion is incomplete. While it is generally believed that direction is the main representational feature of motion, motion processing is also influenced by nondirectional orientation signals that are present in most motion stimuli. Here, we aimed to test whether this nondirectional motion axis contributes motion perception even when orientation is completely absent from the stimulus. Using stimuli with and without orientation signals, we found that serial dependence in a simple motion direction estimation task was predominantly determined by the orientation of the previous motion stimulus. Moreover, the observed attraction profiles closely matched the characteristic pattern of serial attraction found in orientation perception. Evidently, the sequential integration of motion signals strongly depends on the orientation of motion, indicating a fundamental role of nondirectional orientation in the coding of visual motion direction.
尽管视觉运动处理至关重要，但我们对大脑如何表示运动的基本方面的理解并不完整。虽然人们普遍认为方向是运动的主要表示特征，但运动处理也受到大多数运动刺激中存在的非定向方向信号的影响。在这里，我们旨在测试即使刺激中完全没有方向信号，这种非定向运动轴是否也会对运动感知产生影响。使用具有和不具有方向信号的刺激，我们发现，在简单的运动方向估计任务中，序列依赖性主要由前一个运动刺激的方向决定。此外，观察到的吸引力曲线与在方向感知中发现的序列吸引力的特征模式非常匹配。显然，运动信号的顺序整合强烈依赖于运动的方向，这表明非定向方向在视觉运动方向编码中起着基本作用。
