A fixed lateral dendrite score gave no clear tuning prediction gain in 53 olfactory bulb cells from one mouse

We tested whether nearby lateral dendrites predict similar odor responses in cells with a common input. We used X-ray tracings and calcium data from one anesthetized mouse. The main sample had 53 cells, 227 same-class sister pairs, and three glomeruli. A Gaussian score with width 10 micrometres measured nearby lateral cable. Separate repeat halves supplied odor tuning correlations. With geometry and plane controls, the partial rank correlation was 0.00456. Whole-cell label assignments gave a one-direction reference value of 0.489. Adding one intercept per cell gave 0.0761. Each prediction test excluded one cell and all its pairs. Adding proximity to a fixed ridge baseline increased mean squared error from 0.01744545 to 0.01744789, or 0.014%. Cell deletions gave correlations from -0.110 to +0.095. All-cohort planned checks changed prediction error by less than 0.66% in either direction. An exploratory check found repeat-half pair-pattern correlations of 0.506 to 0.650 after the same geometry controls. Thus, little structural gain coexisted with repeatable functional patterns. The result limits this score and fit in one animal. It does not exclude lateral inhibition or other structural predictors. The package preserves the compact dataset, all predictions, code, figures, reference draws, checked source records, and repeat instructions.

olfactory bulb · lateral dendrites · structure and function · sister cells · calcium imaging · X-ray tomography · reproducible data