Figure 1. Effects of ip injection of chlorpheniramine (CPA; n = 22) on the percentage of open arm entries (%OAE; A) and the percentage of time spent in the open arms (%OAT; B) during Trial 1 (T1). CPA (16 mg/kg, ip) or saline (SAL) was administered prior to T1. Data are reported as means ± SE. *P < 0.05 for the differences between the SAL and CPA groups in T1 (Student t-test).