The classification of cat retinal ganglion cells as X or Y on the basis of linearity or
nonlinearity of spatial summation has been confirmed and extended. Recordings were taken …

1. The discharges of single X and Y ganglion cells (distinguished by a test of linearity of
spatial summation) were recorded in the optic tract of anaesthetized, paralysed cats. 2 …

The spatio‐temporal characteristics of cat retinal ganglion cells showing linear summation
have been studied by measuring both magnitude and phase of the responses of these cells …

1. Spatial summation within cat retinal receptive fields was studied by recording from optic‐
tract fibres the responses of ganglion cells to grating patterns whose luminance …

1. Receptive fields of centre surround cells in the rabbit retina were investigated. There is a
clear distinction between cells with sluggish responses, low spontaneous activity and slow …

1. The mechanism which makes Y cells different from X cells was investigated. 2. Spatial
frequency contrast sensitivity functions for the fundamental and second harmonic responses …

The summing properties of ganglion cells in the cat's retina have been examined, using as
stimuli two stationary, flashing spots of light, both positioned within the center regions of the …

1. Macaque retinal ganglion cells having concentrically organized receptive fields were
classified as X-or Y-cells on the basis of the linearity or nonlinearity of their spatial …

1. Variation in stimulus contrast produces a marked effect on the dynamics of the cat retina.
This contrast effect was investigated by measurement of the responses of X and Y ganglion …

1. Y‐type ganglion cells in the cat's retina were stimulated with bars of light and grating
patterns at photopic luminances. Stimuli were stationary, and luminance at each point was …