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. 2010 Jun 14;588(Pt 15):2839–2857. doi: 10.1113/jphysiol.2010.188722

Figure 7. Afterhyperpolarization amplitude is reduced during fictive scratch.

Figure 7

A illustrates extensor (PBSt) and flexor (TA) ENG recordings, the intracellular recording from a GS motoneurone and the current monitor trace. Records in A labelled B, D and * show on an expanded timescale, action potentials evoked by ramp-shaped current injection prior to (B) and following (D and *) ipsilateral fictive scratch. The AHP amplitude remained decreased immediately following fictive scratch (D) and was fully recovered within 10 s of scratch cessation (denoted by *), when compared to control (B). Full recovery of AHP amplitude is clearly illustrated by the overlay of the action potentials in the inset. C and E show an expanded timescale of action potentials evoked by the scratch CPG. AHP amplitude was partially reduced prior to (C) scratch and was almost completely absent during scratch (E), when compared to control (B).