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Effect of vanillin and other treatments on step-down latency. Data are expressed as mean ± SEM. “*” denotes P < 0.05 with respect to the control group within the same day. “##” denotes P < 0.01 with respect to the standard treatment group within the same day. “∧∧∧” denotes P < 0.001 with respect to the negative control group (Sco per se) within the same day. “aaa” denotes P < 0.001 with respect to the SDL of the same group on the 10th day of the treatment.
