On the spatial mismatch of rod and cone mediated inputs to cat retinal ganglion cells.
The determination of threshold sensitivities of cat retinal ganglion cells to 452 nm-blue and 578 nm-yellow narrow-band lights were undertaken prior to the mapping of the rod- and cone-mediated receptive field centres. In some brisk sustained on-centre retinal ganglion cells two distinct and spatially separated regions were noted such that one region was maximally sensitive to 452 nm-blue and the other to 578 nm-yellow lights. The two wavelength-dependent regions of maximal sensitivity are presumably related to asymmetries between rod- and cone-mediated inputs, rather than between inputs mediated by different classes of cones and correspond, respectively, to the loci of the rod- and cone-mediated centres.
Department of Communication and Neuroscience, University of Keele, Staffordshire, England.
B
B
Ahmed
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P
Hammond
D000200:Action Potentials; D000221:Adaptation, Ocular; D000818:Animals; D001931:Brain Mapping; D002415:Cats; D009898:Optic Disk / Q000502:physiology; D010786:Photoreceptor Cells / Q000502:physiology*; D012160:Retina / Q000502:physiology*; D012165:Retinal Ganglion Cells / Q000502:physiology*; D012684:Sensory Thresholds / Q000502:physiology; D013053:Spectrophotometry