Figure 4. Histograms showing the normalized Fos counts for Group Novel (dark) and Group Familiar (light) for the seven grouped regions of interest. Because the data are normalized they sum to 100. Abbreviations: AC = anterior cingulate cortex; AD = anterior dorsal thalamic nucleus; AM = anterior medial thalamic nucleus; Audp = primary auditory cortex; AV = anterior ventral thalamic nucleus; DG = dentate gyrus; dSub = dorsal subiculum; Hpc = hippocampus; I = infralimbic cortex; lEnt = lateral entorhinal cortex; MD = medial dorsal thalamic nucleus; mEnt = medial entorhinal cortex; PL = prelimbic cortex; Perirhinal cortex (r = rostral; m = mid; c = caudal, areas 35 and 36); PPC = posterior parietal cortex; Rdg = retrosplenial dysgranular cortex; Rga = retrosplenial granular a; Rgb = retrosplenial granular b; SS = somatosensory cortex; Te2 = cortical area Te2; Visp = primary visual cortex; vSub = ventral subiculum. * p < 0.05, ** p < 0.01, *** p < 0.001 (simple effects).