Photomicrographs to illustrate the distribution of c-fos mRNA within the BSTov (A and B) and CEA (C and D) 30 min after an amphetamine injection, 2 mg/kg i.p. under conditions of background (60 dBA; A and C) or stressful (100 dBA; B and D) white noise. Note that within the CEA, amphetamine-induced c-fos mRNA expression is largely restricted to the lateral division. Abbreviations: ac, anterior commissure; BLA, basolateral nucleus of the amygdala; BSTov, bed nucleus of the stria terminalis, oval subdivision; CEA, central nucleus of the amygdala; CP, caudate putamen; int, internal capsule; opt, optic tract; PVN, paraventricular nucleus of the hypothalamus; st, stria terminalis. Scale bar, 300 μm.