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Axonal Noise as a Source of Synaptic Variability

Figure 4

Travelling APs' waveform fluctuations scale with axonal diameter with an inverse power low.

(A) Typical shape of an action potential in the squid giant axon. (B) The variability in the waveform at each moment in time (N = 250). We define the variability as 3×SD of the membrane potential at each point in time. (C) Log-log plot of 3×SD of fluctuations in AP shape over diameter for the rat hippocampal interneuron. (D) Log-log plot of 3×SD of fluctuations in AP shape over diameter for a C-fibre axon. (E) Log-log plot of 3×SD of fluctuations in AP shape over diameter for a squid giant axon (Patlak channels). (F) Log-log plot of 3×SD of fluctuations in AP shape over diameter for a squid giant axon.

Figure 4

doi: https://doi.org/10.1371/journal.pcbi.1003615.g004