Light/dark box test.
(A) Number of entries into the light box. (B) Retention time in the light box. The number of entries into the light box and the retention time in the light box for Groups II and III mice were significantly lower than for Group I mice. Values represent the mean ± SEM (n = 26 for Group I, n = 27 for Group II, n = 27 for Group III). **p<0.01, ***p<0.001.