Põder Endel
Laboratory of Experimental Psychology, University of Leuven, Leuven, Belgium.
J Vis. 2008 Apr 24;8(4):24.1-6. doi: 10.1167/8.4.24.
Some recent studies have suggested that there are actually no crowding effects with detection and coarse discrimination of simple visual features. The present study tests the generality of this idea. A target Gabor patch, surrounded by either 2 or 6 flanker Gabors, was presented briefly at 4 deg eccentricity of the visual field. Each Gabor patch was oriented either vertically or horizontally (selected randomly). Observers' task was either to detect the presence of the target (presented with probability 0.5) or to identify the orientation of the target. The target-flanker distance was varied. Results were similar for the two tasks but different for 2 and 6 flankers. The idea that feature detection and coarse discrimination are immune to crowding may be valid for the two-flanker condition only. With six flankers, a normal crowding effect was observed. It is suggested that the complexity of the full pattern (target plus flankers) could explain the difference.
最近的一些研究表明，在简单视觉特征的检测和粗略辨别方面实际上不存在拥挤效应。本研究检验了这一观点的普遍性。一个目标Gabor斑块，周围环绕着2个或6个侧翼Gabor斑块，在视野的4度偏心率处短暂呈现。每个Gabor斑块的方向要么是垂直的，要么是水平的（随机选择）。观察者的任务要么是检测目标的存在（出现概率为0.5），要么是识别目标的方向。目标与侧翼的距离是变化的。两项任务的结果相似，但2个和6个侧翼的结果不同。特征检测和粗略辨别不受拥挤影响的观点可能仅在两个侧翼的条件下有效。有6个侧翼时，观察到了正常的拥挤效应。有人认为，完整图案（目标加侧翼）的复杂性可以解释这种差异。
