Lagrèze W D, Meigen T, Bach M
Universitäts-Augenklinik Freiburg, Germany.
Ger J Ophthalmol. 1994 Aug;3(4-5):220-3.
Single elements in textures segregate preattentively from the background if they differ in special features from surrounding elements (pop-out). Oblique targets on a background of vertical line elements are more easily detected than vertical targets on a ground of oblique elements. We wanted to find out whether this perceptional asymmetry depends on the absolute orientation or on the alignment of the background lines. Using the method of constant stimuli, we measured the thresholds of detection times in five subjects using four different arrangements of line patterns. The subjects indicated the position of a salient element in a forced-choice procedure. For all subjects, detection times were shortest if background lines were either vertical or collinear. Otherwise, detection times were significantly longer by a factor of 3. Figure-ground segregation is facilitated if background lines are either vertical or collinear.
如果纹理中的单个元素在特殊特征上与周围元素不同，它们会在注意前从背景中分离出来（弹出效应）。在垂直线条元素背景上的倾斜目标比在倾斜元素背景上的垂直目标更容易被检测到。我们想弄清楚这种感知不对称是取决于绝对方向还是背景线的排列。使用恒定刺激法，我们用四种不同的线条图案排列方式测量了五名受试者的检测时间阈值。受试者在强制选择程序中指出显著元素的位置。对于所有受试者来说，如果背景线是垂直的或共线的，检测时间最短。否则，检测时间会显著延长3倍。如果背景线是垂直的或共线的，图-底分离会更容易。
