Figure 6.

Information contained in pairs of spikes I_pair(τ) is typically synergistic at short inter-spike intervals and redundant at longer intervals. The black data points are for LGN and the red are for RGC. The horizontal lines lie at 2 × I_spike which is what we would expect the value of I_pair to be if the spikes in a pair were independent. The width of this line denotes the ±1σ range on 2 × I_spike. We show results for two representative cells (# 2 and 8, Table 1). Only three spot sizes (SS) are shown for each cell because at large spot sizes the low firing rate of the LGN prevents us from reliably determining r_E(t) and hence I_pair.