Receptive fields and trigger features of ganglion cells in the visual streak of the rabbit's retina

Abstract

A survey of the properties of retinal ganglion cells in the central part of the rabbit retina has been carried out. The 5 types of unit previously encountered in the peripheral retina were also found in the central region. Their receptive fields were smaller, andtendedto be oval-shaped with the long axis horizontal. In addition, 3 new types were discovered: orientation-selective cells, local-edge-detectors, uniformity-detectors. Orientation-selective cells were sensitive to either vertically or horizontally extended targets. Analysis suggested they were modified concentric units with an incomplete antagonistic surround. Local-edge-detectors responded to the appearance or movement of a contrasting border within the receptive field. They were inhibited by similar stimulation of the region surrounding the receptive field. Detailed attention was given to the demonstration of edge-detection. Uniformity detectors had a relatively high level of ongoing activity in the absence of stimulation. All forms of stimulation (lights flashed on or off, movement of darker or lighter targets) produced a diminution or cessation of ongoing activity. The results are compared with behaviour described in other species.