title: Centre and surround influences on the proximal negative response of the pigeon retina.
abstract: 1. Extracellular field potentials were recorded with micro-electrodes in the inner plexiform layer of the pigeon retina. Stimulus patterns were projected on a tangent screen.2. Maximal responses to a 1 degrees spot were produced from a receptive area 2-3 degrees in extent. Annuli centred over this area produced a different response wave form.3. The responses to centred spots and annuli presented synchronously do not superpose: they interact in a way suggesting transient mutual antagonism. The response to spot onset and offset can be suppressed either by annulus onset or by annulus offset.4. A steady annulus has little effect on the response to spot stimuli, but a steady centred spot enhances the response to annular stimulation.5. The results suggest that the PNR results from convergence of on-centre and off-centre pathways, which are embedded in a widespread suppressive surround.
mesh_terms: D000200:Action Potentials; D000818:Animals; D010856:Columbidae / Q000502:physiology*; D004596:Electroretinography; D008839:Microelectrodes; D009433:Neural Inhibition; D010775:Photic Stimulation; D012160:Retina / Q000502:physiology*; D014794:Visual Fields