Polarization contrast and motion detection.
Form and motion perception rely upon the visual system's capacity to segment the visual scene based upon local differences in luminance or wavelength. It is not clear if polarization contrast is a sufficient basis for motion detection. Here we show that crayfish optomotor responses elicited by the motion of images derived from spatiotemporal variations in e-vector angles are comparable to contrast-elicited responses. Response magnitude increases with the difference in e-vector angles in adjacent segments of the scene and with the degree of polarization but the response is relatively insensitive to the absolute values of e-vector angles that compose the stimulus. The results indicate that polarization contrast can support visual motion detection.
Glantz
Raymon M
RM
Dept. Biochemistry and Cell Biology, Rice University, 6100 Main St., PO Box 1892, Houston, TX 77251, USA. rmg@bioc.rice.edu
Schroeter
John P
JP
D000818:Animals; D003400:Astacoidea / Q000502:physiology*; D003118:Color Perception / Q000502:physiology / Q000528:radiation effects; D015350:Contrast Sensitivity / Q000502:physiology* / Q000528:radiation effects; D005556:Form Perception / Q000502:physiology / Q000528:radiation effects; D008027:Light; D009039:Motion Perception / Q000502:physiology* / Q000528:radiation effects; D010775:Photic Stimulation / Q000379:methods; D012029:Refraction, Ocular / Q000502:physiology / Q000528:radiation effects; D012542:Scattering, Radiation; D014795:Visual Pathways / Q000502:physiology