The structured ‘low temperature’ phase of the retinal population code
Fig 7
Targeted manipulations of the correlation matrix.
A. The specific heat plotted versus temperature for several values of the connectivity, L (see text). B. The specific heat plotted versus temperature for several values of the global covariance α (see text). C. The specific heat at the operating point of the network (T = 1) plotted as a function of α. For subnetworks of different sizes, we inferred the pairwise maximum entropy models for a given α. Error bars are standard error of the mean over ten different choices of cells per subnetwork size. Red dashed line indicates our estimate of the discontinuity (which occurs between the values of α = 0.225 and α = 0.25). D. Same calculation as C, but for correlations and firing rates measured in the dark.