First-order color vision is slow; Second-order color vision is fast

Why is second-order vision less efficient than first-order vision?

Research has shown that the sensitivity to second-order modulations of carrier contrast is lower than that to first-order luminance modulations stimuli. We sought to compare the efficiency of processing first- and second-order information. Employing a phase-discrimination paradigm we found that when humans were given sufficient a priori information of signal parameters they detected both lumina...

Our Color Vision is Limited

Pooling of first-order inputs in second-order vision

The processing of texture patterns has been characterized by a model that first filters the image to isolate one texture component, then applies a rectifying nonlinearity that converts texture variation into intensity variation, and finally processes the resulting pattern with mechanisms similar to those used in processing luminance-defined images (spatial-frequency- and orientation-tuned filte...

[Color vision].

INTRODUCTION .......................................................................................................... 42 Trichromacy and the Trichromatic Theory .............................................................. 42 Psychol~hysical l~$timates of the Cone Sensitivities .................................................... 44 The Two-Color Procedure and the ~" Mechanisms ................

Global motion processing in human color vision: a deficit for second-order stimuli.

The investigation of the mechanism of global motion in color vision has been limited because the processing of the first-order chromatic RDK elements, based on low-level linear motion detectors, is impaired. Here we return to this problem by using second-order elements in a global motion stimulus. Second-order RDK elements were circular contrast-modulated (CM) envelopes of a low-pass filtered n...