Effect of neonatal capsaicin treatment on capsaicin-evoked responses at postnatal days 19–20. Number of eye wipes within 2 min after eye instillation (i.s.) of 0.01% capsaicin or solvent into either eye. Mean ± SEM. Cap and Veh responses measured in 27 capsaicin-treated and 13 vehicle-treated rats, respectively. **, P < 0.01; vs. capsaicin (i.s.) in capsaicin-treated rats and vs. solvent (i.s.) in both capsaicin- and vehicle-treated rats (one-way ANOVA followed by Bonferroni post-hoc correction). The numbers on the top-right shoulder of the bars indicate the number of rats.