Figure 3. Effects of tVNS on NWR threshold.
Repeated measures two-way ANOVA revealed an interaction between stimulus and time factor (F = 4.671, p = 0.005). Moreover, t-test results with Bonferroni correction showed an increased NWR threshold in the tVNS condition at Post 10 and Post 30 compared to the Baseline NWR threshold (10 min: t = −2.96, p = 0.008; 30 min: t = −3.076, p = 0.006). There was no significant difference in the Sham condition (p > 0.05).