Fig. 8

The distributions of action values over a brief time interval of 20 ms for all reliable SEEs. Plotted in a and d are the action distributions for Type I (top row) and Type II (bottom row) models, respectively. The distribution is equally divided into three subclasses. The STA of each subclass is shown in b and e with different line types each marking one subclass as in a and d. The histograms for the standard deviation of the spike times over all 40 trials for each subclass of reliable SEEs, as identified in panels a and d, are shown in c and f. Note that the subclass of reliable SEEs with lower actions typically have smaller standard deviations (SDs) of firing times, thus indicating more closely synchronized spike time reliability. Noise coefficients ${\delta }_1$ and ${\delta }_2$ for Type I and Type II are as in Figs. 3b, d