Wilson H R, Richards W A
Visual Sciences Center, University of Chicago, Illinois 60637.
J Opt Soc Am A. 1992 Oct;9(10):1653-62. doi: 10.1364/josaa.9.001653.
Visual discrimination of contour curvature was investigated by using contours defined by the locus of points at which the phase of a square-wave grating was shifted by 180 degrees (a texture boundary). Curvature-increment thresholds were measured for contour curvatures from 0.31 to 10.65 deg-1, for grating spatial frequencies of 4.0 and 16.0 cycles per degree (cpd), and for gratings in either sine or cosine phase at the point of maximum curvature. Thresholds for these conditions were compared with curvature discrimination at black-white edges. Grating phase had no effect on performance at any curvature or grating frequency, but 16.0-cpd gratings produced a threshold elevation at all curvatures by an average factor of 2.4. Two-line separation discrimination was also measured for lines defined by texture boundaries. These data can be predicted by a model incorporating end-stopped complex cells of a type reported physiologically in primate area V2.
通过使用由方波光栅相位偏移180度的点的轨迹所定义的轮廓（纹理边界）来研究轮廓曲率的视觉辨别。测量了轮廓曲率在0.31至10.65度^-1范围内、光栅空间频率为每度4.0和16.0周/度（cpd）以及在最大曲率点处处于正弦或余弦相位的光栅的曲率增量阈值。将这些条件下的阈值与黑白边缘处的曲率辨别进行了比较。光栅相位在任何曲率或光栅频率下对性能均无影响，但16.0-cpd光栅在所有曲率下均使阈值升高，平均升高系数为2.4。还测量了由纹理边界定义的线条的两线分离辨别。这些数据可以通过一个包含在灵长类动物V2区生理上报道的一类终端停止复杂细胞的模型来预测。
