Figure 4. Response thresholds in control and iOVD groups. (A) Primary endings (n = 43). (B) Secondary endings (n = 27). Response thresholds were analyzed by the amount of jaw opening required for the first spike to fire. Significantly higher threshold values were obtained after 5 days of iOVD in both primary and secondary endings. Error bars indicate SD. *Statistical significance vs. control; ANOVA followed by Scheffé’s post hoc test (5% significance level).