A Model for Integrating Elementary Neural Functions into Delayed-Response Behavior
Figure 14
Perturbation to the Firing Pattern of Control Unit Iu
To test the robustness of the network's dynamics, the firing patterns of control units were perturbed by adding to them white noise of varying strength A.
The top curve (A = 0) shows the unperturbed firing pattern for gating Iu. It is binary, being either equal to 0 (i.e., gating Iu fully closed) or 1 (Iu fully open).
The next three curves are examples of activities perturbed with noises of amplitude A = 0.5, 1, and 2. There, activities are no longer binary as they can take any value between 0 and 1. Such intermediate values correspond to gating Iu being partially open (i.e., transmitting only a portion of the information traveling from layer WM to layer P).
A similar analysis extends to disturbing the other control units of the model.