Extended Data Fig. 9: A 6-node SC model replicates results from the 4-node SC model.

a, Schematic of the 6-node SC model, in which each hemisphere contains two Anti pools and one Pro pool. b, Format and results similar to Fig. 7e. Histogram of horizontal weights between the two Pro units (as illustrated by the insert cartoon) for all 36 six-node model solutions. Red arrow marks average value across solutions. Solutions do not require inhibitory weights between the two Pro/Contra pools. c, Format and results similar to Fig. 7c. Scatter plot of diagonal weights (from Anti units to the Pro unit on the opposite hemisphere) against vertical weights (from Anti units to the Pro unit on the same hemisphere), for all model solutions. Each dot represents the average weights from the two Anti units in a solution. Red line marks unity. d, Format and results similar to Extended Data Fig. 8a. Histogram of choice d’ for Pro and Anti nodes during the choice period (n = 36 model solutions). We observed both Anti/Ipsi and Anti-Contra-preferring units, with a majority of Anti/Ipsi units, as in the experimental data. e, Similar to Extended Data Fig. 8d. Percentage of model solutions with positive eigenvalues for each Schur mode type, based on Schur Decomposition analysis of the connectivity matrix. The solution networks (n = 36 solutions, red, mean ± 95% CI) are compared against 10,000 random networks (black) with the same symmetry and parameter value constraints. Dashed line indicates results from 10,000 random networks with the same symmetry, but not the parameter value constraints.