Integration of first- and second-order orientation.

摘要: The problem of how visual information such as orientation is combined across space bears on key abilities, texture perception. Orientation signals can be derived from both luminance and contrast, but it not well understood pooled or these different interact in the integration process. We measured discrimination thresholds for arrays equivisible first-order second-order Gabors. Thresholds were variability increased, we estimated number samples (or efficiency) internal noise mechanism being used. Observers able to judge mean either first- For Gabors, estimates used increased Gabors increased. When judging order, observers ignore randomly oriented opposite order. If did know which Gabor type carried more useful information, they tended use (even when this was poorer information). unable combine though would have improved their performance. system appears separate integrators combining local luminance- contrast-defined features.