Skip to main content
. 2007 Feb 1;580(Pt 2):685–696. doi: 10.1113/jphysiol.2006.126003

Figure 3. Threshold electrotonus in sensory and motor axons using test stimuli of different widths.

Figure 3

A, threshold electrotonus to a 100 ms depolarizing conditioning current set to +40% of the threshold current for the test potential recorded from sensory axons using test stimuli of 1.0 ms (▪), 0.5 ms (○) or 0.2 ms (⋄) duration. Data are means ± s.e.m. for 7 subjects, except for 0.2 ms where data for five subjects are shown (stimulus artefact prevented valid recordings in two subjects with this test width). B, equivalent recordings for motor axons using test stimuli of 1.0 ms (▪) for 0.5 ms (○) duration. Data are means ± s.e.m. for 7 subjects. Recordings could not be made using test stimuli of 0.2 ms duration because threshold for a 40% CMAP was then so high that the conditioning current for the threshold electrotonus was not easily tolerated.