Fig. 4: ModO contains two distinct cycles with different projections to the ABD.

a, Eigenvalue spectrum for modO when connections are shuffled (Methods), with modO treated as a single block (left) or as two blocks consisting of modO_M and modO_I with interconnections removed (middle) or intact (right). Im, imaginary; Re, real. b, Eigenvalue spectrum for the actual connectome. c, Matrix of synaptic connections for modO and its connections to the ABD. Cells are grouped by block identity in a seven-block SBM. The orange and purple boxes highlight cycles in the connections within blocks O_M1–O_M3 and blocks O_I1–O_I3, respectively. Gray ticks indicate the location of Ve² cells. d,e, Eigenvalue spectrum of modO after the cycles are decoupled by eliminating connections between the internuclear cycle and the other four blocks (d) and when the connections within the internuclear cycle are additionally shuffled (e). f, Diagram of connections between blocks in modO. Solid lines indicate the most prominent connections, and dashed lines indicate weaker connections. g, Leading (left, purple) and second leading (right, orange) eigenvectors for modO (top) and modO with the two cycles decoupled as in d.