Abstract
(1) Extracellular single-unit records were taken from pigeon ganglion cells, and responses to spots and annuli were recorded as average response histograms. (2) The responses to annular flashes were compared in the presence of a steady spot at the field centre, and in its absence. For 58 out of 61 pairs of histograms the response to an annular flash was greater when the central spot was present. On-centre cells gave off-responses to the annulus; off-centre cells gave on-responses; on-off cells gave on and off responses. (3) Histograms were recorded when an annular flash was delivered in the presence of baseline spike counts. In on-centre cells there was transient spike deletion at onset and offset, with a late off-discharge. In on-off cells there was transient spike deletion at onset and offset, followed in some cases by discharge peaks. (4) It appears that all three types of ganglion cell have elements of a concentric organization, with antagonistic and possibly suppressive surrounds, and with surrounds that can produce spike discharge.
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