Spatiotemporal Edge Perception (Spatio-Temporele Waarneming van Luminantie-Overgangen).

摘要

The edges of straight bars in a square-wave luminance grating appear undulating to an observer when the retinal image of this pattern is in motion. The amplitude of the perceived undulations increases linearly with retinal image speed with an average slope of 30 ms. The period of the motion induced bulges is 2.5 deg and shows no consistent variation with the retinal image velocity of the pattern. There is a close quantitative agreement between the spatiotemporal extent of this effect and recent estimates of the spatiotemporal parameters of human motion-sensitive mechanisms. As a tentative explanation for these observations we hypothesize that a moving luminance edge is encoded on a sparse sampling grid of motion sensitive cells in the central nervous system. These cells have a fixed time constant but change their shape and size with retinal image velocity.