Fig. 5.

Maximum entropy models. a A segment of the simultaneous responses of 40 ganglion cells in the salamander retina to a natural movie clip (top panel). Discretization of parallel spike trains into binary patterns is shown below (green). The binary vectors describe the joint activity patterns of the cells at a given time point. For clarity, 10 out of 40 cells are shown (bottom panel). b Using the same group of 10 cells from panel a, the rate of occurrence of each firing pattern predicted from a maximum entropy model $P_2$ that takes into account all pairwise correlations is plotted against the pattern rate measured in the recorded data (red dots). For comparison, the independent model $P_1$ is also plotted in gray. The black line indicates equality

(Reproduced with permission from Schneidman et al. 2006)