Average histograms from example units of the 2-population spiking model showing the excitatory and inhibitory working memory patterns, and average histograms from representative single neuron recordings from the database of prefrontal and parietal neurons exhibiting the same general patterns.

<p>PSTH histograms of spiking model units are shown in the left columns and real neuron histograms in the right columns. The gap between baseline and delay periods corresponds to the cue period (firing rate not shown). Histograms of the model units were averaged over 10 simulated trials of the working memory task. Patterns exhibited are A) Stable fixed rate memory (i.e. bistable) cell behavior, B) ramping cell behavior, C) decaying memory cell behavior, D) fixed rate inhibition cell behavior, E) ramping inhibition, and F) decaying inhibition.