Time-averaged (over six episodes and 1,738 time steps) stimulus integration timescales associated with stable eigenmodes of recurrence Jacobian J rec show a bulk of relatively short timescales (within 12 time steps, lower dotted line). The top five integration timescales for the agent shown are 56.5, 13.0, 7.7, 6.8 and 5.8 time steps. Before training, timescales associated with W h’s eigenmodes can be large, even exceeding the length of the training/evaluation episodes (300 steps or 12 s, upper dotted line). 99% confidence interval bands have been plotted for the after-training timescale curve, but these bands are of negligible magnitude and therefore invisible. See Supplementary Figs. 23–27 for corresponding plots for other agents.
