Fig. 5.

Neural firing entropy from a simple model of the area X microcircuit in different conditions. (A) The entropy of the distribution of pallidal firing phase varies with synaptic amplitude and period of E microcircuit drive relative to pallidal period. (B) Same as A, but for EI microcircuit. (C) Effects of probabilistic inclusion of the inhibitory element on firing-phase distribution. Pallidal neuron intrinsic firing had low variability (CV = 0.05). Heat map shows the effect on the pallidal phase–probability distribution as the probability of selecting the EI microcircuit varied from 0 to 1 (abscissa). For each EI probability, the resulting phase (left ordinate) probability distribution is plotted as a column of heat values. Entropy from each column is plotted (right ordinate) as a white line. Insets show the probability distribution at three example EI probability values, corresponding to blue circles.