Fig. 3.

Effects of scratching on 5-HT-evoked firing. A: PSTH of averaged neuronal firing (n=13) following id 5-HT. Two-headed arrow indicates duration of off-site scratching. Gray error bars: SEM. B: as in A for on-site scratching. C: PSTH of averaged neuronal firing (n=6) following id saline, with off-site scratching. D: as in C for on-site scratching. E: Graph plots mean 5-HT-evoked firing rate before, during and after off-site scratching. Inset: spinal recording sites (dots) plotted on schematic of lumbar dorsal horn. Numbers indicate laminae. *: significantly different from before (p<0.05, Bonferroni following one-way repeated measures ANOVA). F: graph as in E for on-site scratching. During is significantly different from before (p<0.05, Bonferroni following One-way repeated measures ANOVA). After is significantly different from before (p<0.05, paired t-test). Please add different symbol at during. G: mean firing rate following id saline, with off-site scratching. *: significantly different from before (p<0.05, Bonferroni following One-way repeated measures ANOVA). H: graph as in G for on-site scratching. *: significantly different from before (p<0.05, Bonferroni following One way repeated measures ANOVA).