کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4036363 | 1603246 | 2006 | 13 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Visual discrimination of local surface structure: Slant, tilt, and curvedness Visual discrimination of local surface structure: Slant, tilt, and curvedness](/preview/png/4036363.png)
In four experiments, observers were required to discriminate interval or ordinal differences in slant, tilt, or curvedness between designated probe points on randomly shaped curved surfaces defined by shading, texture, and binocular disparity. The results reveal that discrimination thresholds for judgments of slant or tilt typically range between 4° and 10°; that judgments of one component are unaffected by simultaneous variations in the other; and that the individual thresholds for either the slant or tilt components of orientation are approximately equal to those obtained for judgments of the total orientation difference between two probed regions. Performance was much worse, however, for judgments of curvedness, and these judgments were significantly impaired when there were simultaneous variations in the shape index parameter of curvature.
Journal: Vision Research - Volume 46, Issues 6–7, March 2006, Pages 1057–1069