Figure legends
Fig. 1. Schematic diagrams showing the location of brain
regions in which Fos-immunoreactive cells were counted (open square).
For simplicity, the locations are shown only on the right side. For an
explanation of abbreviations, see the corresponding numbers in Table 3.
Fig. 2. Duration of freezing, duration of investigation, and
frequency of walking during the test period of Experiment 1.
Fear-conditioned subjects received an intraperitoneal administration of
either haloperidol (Hal, n = 8), SR49059 (SR, n = 6),
atosiban (Ato, n = 8), naloxone (Nal, n = 6), or saline
(Sal, n = 6) and were tested in the presence of an associate
(Social: open bars). Fear-conditioned subjects received an
intraperitoneal administration of saline and were tested alone (Alo:
filled bars, n = 7). *P < 0.05 as determined
using MANOVA, followed by Dunnett’s post hoc test.
Fig. 3. Frequency of walking (mean ± SEM) in each 5-min bin in
Experiment 2. The subjects received an intraperitoneal administration of
either naloxone (Nal, n = 8) or saline (Sal, n = 8) and
underwent the open-field test.
Fig. 4. Representative photomicrographs showing
Fos-immunoreactive cells in the nucleus accumbens (NAc) shell, anterior
cingulate cortex (ACC), insular cortex (IC), and paraventricular nucleus
of the hypothalamus (PVN) of fear-conditioned subjects that received an
intraperitoneal administration of saline (Sal) or naloxone (Nal) and
were tested in the presence of an associate. Scale bars indicate 200 µm.