Table 1.

Average reference memory errors per trial before and after stimulation/control in the different groups

Group	Week - 2	Week - 1	Week 1	Week 4	Week 7
Control 10-AD	0.39 ± 0.14	0.1 ± 0.08	1.0 ± 0.34	0.88 ± 0.29	1.61 ± 0.32
10-AD	0.3 ± 0.14	0.25 ± 0.1	2.28 ± 0.27ab	1.88 ± 0.26ab	1.5 ± 0.31
Control 5-AD	0.33 ± 0.1	0.4 ± 0.08	0.63 ± 0.18	0.69 ± 0.26
5-AD	0.56 ± 0.15	0.29 ± 0.09	0.63 ± 0.08b	1.13 ± 0.24b
Control LTP	0.35 ± 0.15	0.24 ± 0.11	0.68 ± 0.19	1.21 ± 0.45
LTP	0.23 ± 0.06	0.19 ± 0.07	0.69 ± 0.27	0.88 ± 0.23

Week - 2 was the average of the eight trials from - 7 to -4 d before stimulation treatment, week - 1 was the average of six trials from - 3 to - 1 d before, and weeks 1, 4, and 7 are averages of four trials during the particular week after treatment. Treatment consisted of control group for 10 ADs, 10-AD group, control for 5 ADs, 5-AD group, control for the primed burst stimulation (PBS) or long-term potentiation group and the LTP group given 12 primed-burst train stimulation. All groups had eight rats except LTP, and its control groups had seven rats. Blank entries indicate data were not available.

^aP < 0.05, between one experimental group and its control group, post hoc Newman-Keuls test,

^bP < 0.05, Wilcoxon test, between 10-AD and 5-AD groups.