Electrical links without chemical currents identified readout filter values for 283 of 302 cells in a complete linear worm model with static input gains

We asked whether known electrical contacts can separate readout delay from neural delay. We used the corrected July 2020 Cook C. elegans map and proved an inverse response rule. An electrical direction with no parallel chemical current identifies a normalized readout transfer value from DC and a response at another rate. The rule requires a complete square response matrix, a linear model, static input gains, and correct contact support. It cancels unknown real input and output gains. For a readout with one decay time, one complex sine matrix is enough. The map had 1,428 eligible directions that covered 283 of 302 cell slots; 254 cells had more than one anchor. A stable chosen model recovered the one-time parameters with relative error below 6.3e-15. In 30 error draws at each of four frequencies, a 0.1% response-matrix norm error left a median 67.5% of cells within 10% time error at the best tested frequency. A passive three-cell example gave 47.6% error after one cell was hidden. A common actuator delay could move into the readout filters without changing the complete observed response. The result is a conditional calibration method and a set of failure tests. It does not estimate conductances or indicator times in living worms. The package preserves proofs, code, contact tables, source checks, model parameters, cell estimates and figures.

connectome · calcium imaging · electrical synapse · readout dynamics · system identification · C. elegans · measurement calibration