Table 1. Descriptive statistics of c-Fos-IR in brain regions.

Statistically significant differences were determined by Kruskal-Wallis test, followed by Dunn’s test for multiple comparisons: a – significantly different from Social lights on, b- significantly different from Social lights off, p<0.05), double letters indicate p<0.01, triple letters indicate p<0.001. Brain regions with significant differences between groups are italicized. IQR = interquartile range.

Brain region	Bregma Level (mm)	Kruskal-Wallis (df = 2)	Social, lights on (median , 25% – 75% IQR)	Social, lights off (median , 25% – 75% IQR)	Individual, lights off (median , 25% –75% IQR)
Cortex:
Prelimbic	1.94–1.54	H=13.3, p=0.0013	0, 0–0.19	3.5, 1.25–6aaa	0.38, 0–0.69
Infralimbic	1.94–1.54	H=12.6, p=0.018	0, 0–0	1.5, 0.86–2.13aaa	0.63, 0–1.25
Anterior Cingulate	1.94–1.34	H=12.5, p=0.0020	0, 0–0.38	26.8, 7.25–60.7aa	4, 0–9.63
Motor	1.94–1.34	H=13.0, p=0.0015	0.13, 0–0.44	55.3, 17.4–175aa	3.75, 0–24b
Hippocampus:
Dorsal Dentate Gyrus	(−3.08)–(−3.52)	H=11.5, p=0.0032	20.9, 15.8–25.6	11.9, 9.88–14.4	9.76, 8.38–13.7aa
Dorsal CA1	(−3.08)–(−3.52)	H=2.30, p=0.317	0, 0–0.19	0, 0–0.19	0,0–0
Dorsal CA3	(−3.08)–(−3.52)	H=17.9, p<0.0001	0.13, 0–0.63	6.75, 5.63–8.31aaa	4.63, 2.81–5.19a
Ventral Dentate Gyrus	1.22–(−2.06)	H=15.9, p=0.0004	9.88, 7.56–15.9	0.75, 0.56–1aa	0.75, 0.063–0.94aaa
Ventral CA1	1.22–(−2.06)	H=15.9, p=0.0003	0, 0–0.81	13.9, 12.4–16aaa	11.3, 10.4–15.9aa
Ventral CA3	1.22–(−2.06)	H=2.79, p=0.248	0, 0–0.19	0.25, 0–0.63	0, 0–0.38
Amygdala:
Basolateral Amygdala	(−0.94)–(−1.58)	H=8.37, p=0.0152	0.13, 0–0.44	1.25, 0.063–2.88	2.38, 1.13–6.63a
Central Amygdala	(−0.94)–(−1.58)	H=11.2, p=0.0038	0.13, 0–0.44	0.50, 0.063–3.38	2.75, 2.3–4.69aa
Lateral Amygdala	(−0.94)–(−1.58)	H=6.44, p=0.0399	0, 0–0	0.25, 0–1.13	0.25, 0–0.44
Striatum:
Nucleus Accumbens Core	1.54–1.10	H=6.19, p=0.0452	0, 0–0	0.25, 0–0.88	0, 0–0
Nucleus Accumbens Shell	1.54–1.10	H=13.7, p=0.0011	0, 0–0	1, 0.75–3.63aa	0, 0–0bb
Hypothalamus:
Suprachiasmatic Nucleus	(−0.34)–(−0.82)	H=16.4, p=0.0003	43.9, 31.1–54.5	9.88, 1.44–16.9a	1.88, 1.25–5.31aaa
Paraventricular Nucleus Hypothal	(−0.58)–(−0.94)	H=0.713, p=0.700	0, 0–0.19	0, 0–0.19	0, 0–0.75
Anterior Hypothalamus	(−0.70)–(−1.06)	H=8.28, p=0.016	7.88, 6.54–14.1	23.9, 20.3–36.8a	13.3, 4–14.4
Midbrain:
Edinger- Westphal Nucleus	(−2.92M–3.64)	H=6.73, p=0.0346	0.17, 0–1.50	2.67, 1.33–4.25a	1.33, 0.083–1.92