Qiu Cheng, Kersten Daniel, Olman Cheryl A
Department of Psychology, University of Minnesota, Minneapolis, MN, USA.
J Vis. 2013 Nov 20;13(13):19. doi: 10.1167/13.13.19.
In the tilt illusion, the perceived orientation of a target grating depends strongly on the orientation of a surround. When the orientations of the center and surround gratings differ by a small angle, the center grating appears to tilt away from the surround orientation (repulsion), whereas for a large difference in angle, the center appears to tilt toward the surround orientation (attraction). In order to understand how segmentation/perceptual grouping of the center and surround affect the magnitude of the tilt illusion, we conducted three psychophysical experiments in which we measured observers' perception of center orientation as a function of center-surround relative contrast, relative disparity depth, and geometric features such as occlusion and collinearity. All of these manipulations affected the strength of perceived orientation bias in the center. Our results suggest that if stronger segmentation/perceptual grouping is induced between the center and surround, the tilt repulsion bias decreases/increases. A grouping-dependent tilt illusion plays an important role in visual search and detection by enhancing the sensitivity of our visual system to feature discrepancies, especially in relatively homogenous environments.
在倾斜错觉中，目标光栅的感知方向很大程度上取决于周围环境的方向。当中心光栅和周围光栅的方向相差一个小角度时，中心光栅似乎会朝着远离周围方向倾斜（排斥），而当角度差异较大时，中心光栅似乎会朝着周围方向倾斜（吸引）。为了理解中心和周围的分割/感知分组如何影响倾斜错觉的程度，我们进行了三个心理物理学实验，在实验中我们测量了观察者对中心方向的感知，该感知是中心-周围相对对比度、相对视差深度以及诸如遮挡和共线性等几何特征的函数。所有这些操作都影响了中心感知方向偏差的强度。我们的结果表明，如果在中心和周围之间诱导出更强的分割/感知分组，倾斜排斥偏差就会减小/增加。依赖分组的倾斜错觉通过增强我们视觉系统对特征差异的敏感性，在视觉搜索和检测中起着重要作用，尤其是在相对均匀的环境中。
