Figure 4.

Effects of drug treatment on reaction time and accuracy for the (a) VDTs, and (b) CRT and SRT. Each figure represents the results at each stimulus-presenting time. The x-axis shows P (placebo), E (ebastine), C2 ((+)-chlorpheniramine 2 mg) and C6 ((+)-chlorpheniramine 6 mg), and the y-axes show the ratios of reaction time or accuracy of post-dose to those of pre-dose. *P < 0.05, **P < 0.01 and ***P < 0.001 vs placebo (Dunnett's multiple comparison test).