Fig. 6.

We plot the evolution of amplitudes in the and upper $\{y\}$ layer when two superposed inputs are presented. Each sinusoidal pattern shows the real-valued amplitude of a unit plotted on the vertical axis against time in iteration steps along the horizontal axis. There are two upper $\{y\}$ layer units that respond to the superposition. Note that these responses are out of phase with each other ($180{}^{\circ }$ apart)