difference was apparentp = 0.012
Importantly, the frequency of rearings, which have been used as a marker of environmental novelty and an index of environmental information acquisition ( Thiel et al., 1999 ; Lever et al., 2006 ), was also increased in β2-/- mice over the entire 1-h period ( Figure 6G ) [genotype: F (1,34) = 8.767, p = 0.006] and this difference was apparent both during the first [ F (1,34) = 7.093, p = 0.012] and during the second [ F (1,34) = 7.524, p = 0.010] half hour periods ( Figure 6H ).