Daumail Loïc, Blake Randolph, Tong Frank
Department of Psychology, Vanderbilt University, Nashville, Tennessee, United States.
School of Psychology, Georgia Institute of Technology, Atlanta, Georgia, United States.
Res Sq. 2025 Apr 7:rs.3.rs-6277666. doi: 10.21203/rs.3.rs-6277666/v1.
The constructive nature of motion perception has been highlighted in studies of the visual phantom illusion. Visual phantoms can occur when two low-contrast collinear drifting gratings are separated by a blank gap, leading to the ghostly impression of drifting stripes that extend through the gap. Although previous work has shown that phantom-inducing gratings can elicit a motion aftereffect (MAE) in the gap region, it is not known whether these MAEs arise from the perception of visual phantoms . Here, we evaluated the strength of MAEs elicited by phantom-inducing gratings and well-matched control stimuli. Either the darkest portion of the inducer gratings matched the background luminance to elicit more vivid phantoms or the mean luminance of the inducers matched the background as a control. Both phantom and control inducers predominantly evoked impressions of opposite-direction motion, but the dynamic MAE proved somewhat stronger for phantom than control inducers. Also, MAEs were more strongly modulated by the physical contrast of the control inducers and less influenced by the contrast of the phantom inducers. These findings suggest that low-level motion adaptation strongly contributes to the MAEs elicited in the gap region but that the magnitude of adaptation is further modulated by phantom perception.
运动感知的建构本质在视觉幻像错觉的研究中得到了凸显。当两个低对比度的共线漂移光栅被一个空白间隙隔开时，就会出现视觉幻像，从而产生一种幽灵般的印象，即漂移的条纹穿过间隙延伸。尽管先前的研究表明，诱发幻像的光栅能在间隙区域引发运动后效（MAE），但尚不清楚这些运动后效是否源于对视觉幻像的感知。在此，我们评估了诱发幻像的光栅和匹配良好的对照刺激所引发的运动后效的强度。诱发光栅的最暗部分与背景亮度匹配以引发更生动的幻像，或者诱发光栅的平均亮度与背景匹配作为对照。幻像和对照诱发刺激主要都引发了相反方向运动的印象，但动态运动后效在幻像诱发刺激中比在对照诱发刺激中更强。此外，运动后效受对照诱发刺激的物理对比度调制更强，受幻像诱发刺激的对比度影响更小。这些发现表明，低水平的运动适应对间隙区域引发的运动后效有很大贡献，但适应的程度还会受到幻像感知的进一步调制。
