Table 1.

Changes in the escape latency of C57BL/6 mice (second)

Day	Control	MK-801
		-	Olanzapine	Haloperidol
1	49.8±4.9	60.0±0.0	60.0±0.0	57.1±2.9
2	36.1±7.3	56.3±2.5	57.8±2.2	47.4±6.7
3	34.0±5.5	56.1±3.9	52.4±3.4	51.0±8.6
4	37.0±6.3	59.4±0.6	46.4±1.2	54.5±3.4
5	29.2±5.6	51.8±3.2	45.6±3.0	37.0±7.6
6	18.3±3.0	56.7±2.3*	46.7±4.4	41.1±8.3
7	18.9±5.2	50.1±5.9*	32.3±5.8	40.3±10.1
8	28.8±6.3	57.9±2.0*	24.7±5.6†	45.3±4.3
9	20.0±3.7	46.6±6.4*	30.8±7.0	40.2±4.3

Values are presented as mean±standard error of mean for six animals per group.

In each trial, mice were placed in the pool at a single starting position and allowed to swim freely until they found the platform. The time required to escape onto the hidden platform was recorded.

^*p<0.05 vs. control group,

^†p<0.05 vs. MK-801-treated group.