The perception of the displacement of luminance-defined contours (i.e., first-order motion) is an important and well-examined function of the visual system.
Luminance (LM)- and contrast-modulated (CM) patterns (see Movie 1) are the more frequently used profiles to represent first- and second-order stimuli, ...
... for discriminating the drift direction of first-order motion (luminance-modulated noise) and a variety of second-order motion patterns (modulations of either the ...
A common mechanism for perceiving first-order, luminance-defined, and second- order, texture-contrast defined apparent motion between two element locations ...
In first order motion an absolute image feature is moving. For example, a bright bar moving on a dark background is an absolute feature because luminance is ...
Perception of moving luminance edges (first-order motion; Fig. 1B) is well- described by a set of luminance-driven, low-level detectors that are ...
Separate neural mechanisms have been suggested for first-order (luminance modulation) and second-order (e.g., contrast modulation) motion in the retinal ...
The input to the first-order motion system is a simple function of the luminance in the neighborhood of each point (8–11). The input to the ...
Unlike first order motion, which is based on spatiotemporal variations in luminance, second-order motion relies on spatiotemporal variation of ...
In the other (second-order), the luminance signal first is filtered and then is rectified or squared before being passed to a motion energy detection stage.