Figure 1.

Effects of nociceptin on spontaneous alternation (A) and total arm entries (B) in the Y-maze in normal mice. Mice were treated with nociceptin (0.5–5.0 nmol mouse⁻¹, i.c.v.) 30 min before the test. The data are expressed as median and interquartile ranges. Figures in parentheses show the numbers of mice used. ^*P<0.05, ^**P<0.01 vs control (Bonferroni's test).