Table 2.

Region	Paired-CS	CS only
Forebrain and Cortex
Prelimbic cortex (PL)	1.959 ± 0.270	1.764 ± 0.191
Anterior cingulate cortex (ACC)	2.524 ± 0.224	1.987 ± 0.081
Insular cortex	1.829 ± 0.058	1.701 ± 0.033
Anterior piriform (APir)	2.791 ± 0.193	2.886 ± 0.159
Posterior piriform (PPir)	2.311 ± 0.207	2.123 ± 0.151
Nuc. Accumbens core (AcbC)	2.268 ± 0.175*	1.791 ± 0.029
Nuc. Accumbens shell (AcbSh)	2.276 ± 0.166*	1.793 ± 0.046
Lateral septum dorsal (LSD)	1.708 ± 0.032***	1.312 ± 0.061
Lateral septum lateral (LSL)	2.311 ± 0.119***	1.610 ± 0.093
Lateral septum ventral (LSV)	1.723 ± 0.087*	1.380 ± 0.068
Anterodorsal BNST (adBNST)	3.024 ± 0.405*	1.892 ± 0.149
Oval nucleus BNST (ovBNST)	3.929 ± 0.565*	1.879 ± 0.128
Ventral BNST (vBNST)	1.690 ± 0.072*	1.479 ± 0.060
Retrosplenial cortex (RSC)	2.498 ± 0.132**	2.009 ± 0.060
Dorsal hippocampus	1.825 ± 0.094	1.712 ± 0.038
Ventral hippocampus	3.237 ± 0.384	2.277 ± 0.131
Primary aud. Cortex (Aul)	2.800 ± 0.184	2.279 ± 0.151
Hypothalmus
Medial preoptic nucleus (mPO)	2.995 ± 0.262**	1.650 ± 0.150
Lateral preoptic nucleus (IPO)	2.305 ± 0.121**	1.790 ± 0.098
Paraventricular nucleus (PVN)	2.469 ± 0.217*	1.690 ± 0.061
Thalamus
Paraventricular nucleus thalamus (PVT)	3.773 ± 0.330*	2.691 ± 0.223
Mediodorsal and intralaminar thalamic nuclei (MITN)	2.770 ± 0.255*	1.984 ± 0.087
Ventral posterolateral nucleus (VPN), Ventral posteromedial nucleus (VPM)	3.213 ± 0.177	3.068 ± 0.230
Medial geniculate nucleus (MG)	4.215 ± 0.469	4.280 ± 0.445
Periaqueductal gray
Dorsomedial PAG (dmPAG)	2.044 ± 0.187	1.807 ± 0.088
Lateral PAG (IPAG)	2.610 ± 0.185*	2.017 ± 0.126
Ventrolateral PAG(vlPAG)	2.142 ± 0.108	1.949 ± 0.214

Group means were tested using the t test with Welch's correction for unequal variance. Data are presented as means ± SEM.

^*P <0.05

^**P< 0.01

^***P<0.00 as compared to ‘Exposure to Unfrightened Mother’.