Link doubling gave no one-percent source-separation gain at leak 0.1 in two passive adult worm models

We tested whether doubling an electrical link can improve source separation in two partial adult worm maps. The passive model used uniform leak and equal independent voltage measurement noise at every cell. At leak 0.1 relative to mean weighted degree, no remote-input case gained more than one percent among 2,693,520 cases in map 7 and 3,154,914 in map 8. At leak 0.01, 61 and 266 cases gained more than one percent. No remote-input case gained more than ten percent on the four-point leak grid with contact or unit weights. An exact rank-one formula permits a pair gain. A trace proof shows that mean squared separation over all source pairs must fall. A five-cell exact example confirms a small pair gain. With equal noise in input currents instead, full-vector separation is unchanged by wiring. Direct solves check every primary link. These are fixed passive models, not measured decoding. Partial anatomy, assumed conductance, full observation and unmeasured noise limit biological claims. Original code, aggregate results, source hashes, a figure and external retrieval steps support reproduction. External records are not bundled.

electrical connectome · source discrimination · passive circuit · measurement noise · C. elegans · biharmonic distance