With odor gains fitted, an apical length timing rule decreased mean calcium test error by 0.039% in sister cells from three mice

We tested whether apical path length predicts slow odor-response time courses among cells that enter the same glomerulus. We derived 394 soma-to-entry paths from public X-ray tracings and tested 352 cells in 64 groups from three mice. A first-order timing rule used path length differences from other sisters. Each scored group was excluded from slope selection. Intercepts and odor gains used target training repeats. Separate repeats gave error decreases of 0.063%, 0.006%, and 0.048%. The equal-mouse mean was 0.039%. It exceeded 995 of 999 within-group length shuffles; the conditional one-sided probability was 0.005. Fitted slope signs varied across mice and repeat sets. A rule based on length after glomerulus-by-plane mean removal gave a mean error increase of 0.008%. Only 230 of 352 cells had a sister in the same plane. A separate shift fitted for each cell increased mean error by 0.393%. The main association is small and does not establish dendritic conduction delays. The data describe three anesthetized mice, with native volume rates of 2.5 to 5.2 Hz. They identify common input units and apical paths, not a full synaptic graph. We preserve source receipts, all exclusions, path measurements, compact responses, prediction code, figures, full shuffle results, validation and repeat instructions.

olfactory bulb · structure and function · apical dendrite · sister cells · calcium imaging · time course · glomerulus · prediction · morphology