Fig. 1: The optimal number of clusters can be roughly estimated from the mean silhouette values, which describe (a) Mean silhouette values for a different number of clusters. (b) Silhouette values for each cell classified by conventional criteria, as described in the methods section. DS, direction selective. Fig. 2: The threshold time T between spikes does not affect the percentage of solitary spikes over a wide temporal range. The percentage of solitary spikes for ten cells in one retinal patch is plotted versus the threshold time T. The percentage of solitary spikes is 7 ± 2 % (mean ± s.e.m) if a threshold T=25 ms is used (percentage solitary spikes for all recorded cells: 10.5 ± 2.4%). The local edge detector and the ON direction selective cell, which fire longer bursts, are not shown. Fig. 3: All retinal ganglion cell types show similar bursting activity, irrespective of the stimulus. (a) Joint interspike interval (ISI) plot for a local edge detector stimulated by a movie sequence. (b) Joint ISI map for an ON direction selective cell stimulated by the same stimulus. (c) and (d) Joint ISI maps for ON transient cells and uniformity detectors during spontaneous activity. (e) Joint ISI map for an ON - OFF direction selective cell in response to a full-field temporal white noise flicker stimulus. (f) Joint ISI map for a mouse retinal ganglion cell (unclassified type) stimulated with a binary spatial white noise checkerboard stimulus. In all graphs four areas were identified: the spikes in the lower right corner (dark grey) represent the first spikes in a coding event, the spikes in the lower left corner the intermediate spikes (black dots) and the spikes in the upper left corner the last spikes in a coding event (light gray). Spikes in the upper right corner represent solitary spikes. The cells' burstiness is reflected by the depletion of interspike intervals in the center of the graphs.

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