Fig. 2.

EEG power density of the occipital and frontal derivations in non-REM sleep over the 12-h recording after diazepam (Dz; 3.0 mg/kg i.p.) for α₂(H101R) mutants (MUT, n = 7) and wild-type mice (WT, n = 8). Means of relative power density of each frequency bin are expressed as a percentage of the corresponding bin in the 12-h period after vehicle treatment (Veh = 100%). Values are plotted at the upper limit of each bin. Horizontal lines above the abscissa indicate frequency bins that differed significantly from the corresponding bins after Veh within each genotype (P < 0.05, two-tailed paired t test). (Lower) Horizontal lines indicate frequency bins where the effect of Dz (difference Dz - Veh) differed between the genotypes (P < 0.05, two-tailed unpaired t test).