[Organization of the receptor inputs of the receptive fields of the retinal ganglion cells in the frog].
The complete spatial summation of photoreceptors in the receptive field of the frog retina's ganglionic cell and the spectrum sensitivity of the field in the center and at periphery for blue, red and green stimuli, were studied. All the fields were divided into three groups: 1) the summation area is the same for all the three colours which suggests an even distribution within the receptive field of photoreceptors with different spectrum sensitivity; 2) a lesser diameter of the summation area for red and green as compared with blue; 3) the least diameter for red, a greater one for green and the greatest one for blue. The different-diameter summation areas suggest a spatial order of the photoreceptor inputs in some receptive fields with cones prevailing in the center and green rods--at periphery. The latter two groups of fields can be considered as transitional toward the concentric type of receptive fields characteristic of the majority of vertebrates.
D000818:Animals; D003118:Color Perception / Q000502:physiology; D010775:Photic Stimulation; D010786:Photoreceptor Cells / Q000166:cytology* / Q000502:physiology; D011895:Rana ridibunda; D012160:Retina / Q000166:cytology*; D012165:Retinal Ganglion Cells / Q000166:cytology* / Q000502:physiology; D014794:Visual Fields
Organizatsiia retseptornykh vkhodov retseptivnykh poleĭ ganglioznykh kletok setchatki liagushki.