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Distributional invariance and proportional scaling in axonal conduction

Cohen, L. D.; Marom, S.

2025-12-04 biophysics
10.1101/2025.10.24.684120 bioRxiv
Show abstract

Conduction velocity along axons reflects geometric and biophysical influences whose joint statistical organization remains largely uncharacterized. Using high-resolution time-of-arrival measurements along hundreds of identified axonal branches in vitro, we quantified how propagation speed changes along trajectories. The ratio between terminal and initial velocities,{rho} = vend/vstart, follows a right-skewed distribution whose shape remains invariant across branch lengths, positions within neurons, and hierarchical aggregation levels. Local conduction profiles reveal a predominantly progressive deceleration along branches. These observations indicate a simple and robust statistical organization of slowdown, suggesting that proportional modulation of propagation speed is a consistent feature of axonal signaling in structurally variable substrates.

Published in Biophysical Journal (predicted rank #1) · training set

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