Figure 1 indicates the discrimination index (DI) of experimental groups. One-way ANOVA showed significant differences in the DI be¬tween groups. (P < 0.01) The Tukey test illustrated that the DI of A? group was significantly lower than the control and sham groups (P < 0.05; P < 0.01, respectively). In addition, the Tukey test illustrated that the discrimination index of A? rats that received CGP35348 (1, 10 ?g/?l) groups were significantly higher than the A? group (P 0.05).

3.2. PAL test
Figure 2A,B indicate the results of the acquisition phase in PAL test. One-way ANOVA showed that there was no significant difference in the STLa in the first acquisition trial, between experimental groups (P > 0.05) (Fig.2.A). Also, one-way ANOVA revealed that there was no significant difference in the number of acquisition trials between experimental groups (P > 0.05) (Fig.2.B).
Figure 2.C,D indicate the results of the retention phase of the PAL test. One-way ANOVA showed that there was a significant difference in the STLr between groups (P 0.05) (Fig.2.C).
One-way ANOVA indicated a significant difference in TDC among experimental groups (P < 0.01). Tukey post-hoc test showed that rats in the A? group had a greater TDC value than the control and sham groups (P < 0.01). Tukey test showed that A? rats that received CGP35348 (1, 10, 100 ?g/?L) had lower TDC values than rats in the A? group (P 0.05) (Fig.2. D).

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