(A) Spatial discrimination task. Mice were trained with two identical
objects placed on one side of cage, then tested with one object displaced to one
of four positions (P1–P4).
(B) Percentage of time spent with the displaced object (DO) in
3–3.5-month-old NTG (top) and APP (bottom) mice at each of the four
positions (P1, P2, P3, P4) during training and test trials (n = 6–8 mice
per genotype and position, total 57 mice). NTG mice (top), two-way ANOVA: test
phase (p < 0.0001), position and test phase interaction (p <
0.001). APP mice (bottom), two-way ANOVA: test position (p < 0.01), phase
(p < 0.001), position and test phase interaction (p < 0.001).
(C) Percentage of time spent with the DO at P2 in 3-month-old NTG and
APP mice after 4 weeks of treatment with saline or levetiracetam (n = 6–8
per genotype/treatment, total 30 mice). Two-way ANOVA: treatment (p <
0.001), test phase (p < 0.0001), treatment and test phase interaction (p
< 0.001).
*p < 0.05; **p < 0.01; ***p <
0.001; Holm-Sidak post hoc test. Values indicate mean ± SEM. See also
Figures S7 and
S9 and Table S2.