Fig. 2.

Basin volume fraction (r = N − 1 = 399): The horizontal axis represents memory pattern number (1–24). The basin number 25 shows the volume fraction which corresponds to the initial patterns that converged into cyclic output states with a period of six steps but not any one of the memory attractors. The basin number 26 shows the volume fraction which corresponds to the initial patterns which did not converged, that means chaotically itinerant . The vertical axis represents the ratio of each sample to the total number of samples. Alternative hatching and nonhatching are used to show different cyclic attractors