Figure 4

FPUT results. (A) Heatmap of nonlinear capacity with zero delay, where the maximum amplitude \(a_{max}\) is a force given in arbitrary units, the input duration is given in units of simulation time steps. (B) Total nonlinear capacity, nonlinear capacity with zero delay (dashed) and with at least delay 5 (dotted) as well as performance on XOR (yellow), time delayed XOR (yellow, dash-dotted), NARMA5 (maroon) and NARMA5 evaluated on a linear reference system with perfect memory (light maroon, dashed) over input duration for fixed \(a_{max}=0.033\). The performance of both XOR tasks is measured using the Cohen’s kappa score and for NARMA it is the squared Pearson’s correlation coefficient. (C, D) Capacity profiles showing total and degree-specific capacities as a function of delay for the parameter configurations indicated by the correspondingly coloured squares in A. (E) Correlations between capacity and task performances for the same parameter ranges of amplitude and duration as shown in (A).