[Photoreceptor organization of the receptive fields of the frog retina and the patterns of visual signal processing]

Structural and functional organization of the photoreceptor inputs of ganglion cells in the frog retina receptive fields to moving dark stimuli and contribution of the cone and rod systems in these processes, were studied. The relationship of the complete spatial summation of the cones system and intensity of the red stimuli indicates the leading role of the cones in the center of the field. Moving stimuli activate different photo-receptors depending on their speed. Slow stimuli activate the cones and the rapid ones activate the rod system.