Saylor Stephanie A, Olzak Lynn A
Department of Psychology, Miami University of Ohio, Oxford, OH, USA.
Vision Res. 2006 Sep;46(18):2988-97. doi: 10.1016/j.visres.2006.03.007. Epub 2006 May 2.
We examined the influence of context on fine orientation discrimination performance using sinusoidal grating patterns. Discrimination performance was impaired in the presence of modulated surrounds of the same spatial frequency, orientation, and contrast as the center. When center and surround were out-of-phase, separated by a gap of mean luminance, or very different in spatial frequency, performance remained at control levels. When center and surround were in-phase but mismatched in mean luminance, suppression was reduced or eliminated and performance was equivalent to luminance-mismatched control conditions. We speculate that lateral interactions in fine orientation discrimination tasks do not occur between objects that are perceptually distinct.
我们使用正弦光栅图案研究了背景对精细方向辨别性能的影响。当存在与中心具有相同空间频率、方向和对比度的调制背景时，辨别性能会受到损害。当中心和背景异相、被平均亮度间隙隔开或空间频率差异很大时，性能保持在对照水平。当中心和背景同相但平均亮度不匹配时，抑制作用会减弱或消除，性能等同于亮度不匹配的对照条件。我们推测，在精细方向辨别任务中，横向相互作用不会发生在感知上不同的物体之间。
