Receptive field mechanisms of sustained and transient retinal ganglion cells in the cat.

摘要: Receptive field organization of 135 sustained and 45 transient retinal ganglion cells was investigated in lightly pentobarbitone-anaesthetised cats. Stimuli were concentric annuli presented alone or simultaneously with a small spot centred on the receptive field, against photopic, mesopic scotopic backgrounds. The addition test led to reduction diameter centre-surround boundary fields (assessed annuli), decrease annulus which most effective surround. In there only marginal boundary, measured annuli, little no annulus. Reducing background intensity from photopic induced changes response patterns independent stimulus intensity. Against backgrounds, large evoked surround-type responses majority all cells. range, could still be cells, whereas predominantly centre-type obtained throughout With transition cone rod vision, surrounds became progressively less responsive than centres; consequence increased. initial, high frequency burst impulses discharges at onset offset evident latency increased substantially. results are consistent model centre surround mechanisms spatially co-extensive albeit different shape, but partially overlapping It is suggested that mechanism more extensive does not extend entirely through field.