Both Martin H, van Ee Raymond, Erkelens Casper J
Utrecht University, Helmholtz Institute, Utrecht, The Netherlands.
J Vis. 2003 Nov 18;3(11):685-97. doi: 10.1167/3.11.4.
We examined whether binocular saccadic eye movements are determined solely by disparity-defined slant or whether they are influenced by both disparity-defined and perceived slant. The Werner illusion was used to distinguish a plane's disparity-defined slant from its perceived slant. Three subjects viewed a horizontally elongated test strip that was flanked vertically by two planes. The perceived slant of the test strip depended on the slant of the flanking planes. Subjects estimated the perceived slant of the test strip by adjusting the angle between two lines in a symbolic top view. The saccadic eye movements between targets on the test strip were recorded both with visual feedback ("later saccades") and without visual feedback ("first saccades"). We calculated vergence differences for saccades between targets on the test strip (and for fixation on these targets). For each geometrical test strip slant we examined whether the vergence differences could be explained as an effect of perceived slant. This study shows that saccadic eye movements are determined predominantly by the disparity-defined slant, but they can be affected by perceived slant, particularly when multiple saccades are being made.
我们研究了双眼扫视眼动是否仅由视差定义的倾斜度决定，还是受视差定义的倾斜度和感知倾斜度两者的影响。使用维尔纳错觉来区分平面的视差定义倾斜度与其感知倾斜度。三名受试者观看了一个水平拉长的测试条，该测试条在垂直方向上由两个平面侧翼包围。测试条的感知倾斜度取决于侧翼平面的倾斜度。受试者通过调整符号俯视图中两条线之间的角度来估计测试条的感知倾斜度。在有视觉反馈（“后续扫视”）和没有视觉反馈（“首次扫视”）的情况下，都记录了测试条上目标之间的扫视眼动。我们计算了测试条上目标之间扫视（以及对这些目标的注视）的聚散差异。对于每个几何测试条倾斜度，我们检查了聚散差异是否可以解释为感知倾斜度的影响。这项研究表明，扫视眼动主要由视差定义的倾斜度决定，但它们可能会受到感知倾斜度的影响，特别是在进行多次扫视时。
