Fig. 4.

Relative band powers on the parietal cortex (PC) in rats treated with tramadol. The rats (n=6) were intraperitoneally administered saline, and tramadol 5, 10, 20 and 40 mg/kg, respectively (group 'Control', 'TRA5', 'TRA10', 'TRA20' and 'TRA40'). Data were expressed as mean±S.D. Data were analyzed by two factor repeated measures ANOVA with time and treatment, and a Bonferroni test was used to analyze variables for time between groups. Only delta1 power showed significant changes by drug treatment in repeated measures ANOVA (F=2.8, p=0.046) but no significance in Bonferroni test.