Percent change from non-food-deprived hamsters in food hoarding for 10 Rev, FW, and BW groups after injection of vehicle or Y1 antagonist into the PVH (A, C, and E) and PFA (B, D, and F). A: percent change in food hoarding of non-food-deprived hamsters of the 10 Rev group injected with vehicle [absolute values: 4.0 ± 1.4 (0–1 h), 0 ± 0 (2 h), 2 ± 1.5 (2–4 h), 0 ± 0 (4–24 h), and 6 ± 3.1 (cumulative)] and Y1 antagonist [absolute values: 1.4 ± 0.4 (0–1 h), 0 ± 0 (1–2 h), 0 ± 0 (2–4 h), 2 ± 0.5 (4–24 h), and 3.4 ± 1.4 (cumulative)] into the PVH. B: percent change in food hoarding of non-food-deprived hamsters of the 10 Rev group injected with vehicle [absolute values: 0 ± 0 (0–1 h), 0 ± 0 (1–2 h), 3 ± 1.3 (2–4 h), 0 ± 0 (4–24 h), and 3 ± 1.3 (cumulative)] and Y1 antagonist [absolute values: 0 ± 0 (0–1 h), 0 ± 0 (1–2 h), 0 ± 0 (2–4 h), 0 ± 0 (4–24 h), and 0 ± 0 (cumulative)] into the PFA. C: percent change in food hoarding of non-food-deprived hamsters of the FW group injected with vehicle [absolute values: 2 ± 1.3 (0–1 h), 0 ± 0 (1–2 h), 3 ± 2.3 (2–4 h), 2 ± 1.7 (4–24 h), and 7 ± 3.9 (cumulative)] and Y1 antagonist [absolute values: 1 ± 0.3 (0–1 h), 0 ± 0 (1–2 h), 4 ± 2.4 (2–4 h), 0 ± 0 (4–24 h), and 5 ± 3.2 (cumulative)] into the PVH. D: percent change in food hoarding of non-food-deprived hamsters of the FW group injected with vehicle [absolute values: 1 ± 0 (0–1 h), 1 ± 0.3 (1–2 h), 4 ± 3.2 (2–4 h), 5.5 ± 1.5 (4–24 h), and 11.5 ± 1.5 (cumulative)] and Y1 antagonist [absolute values: 1.7 ± 0.7 (0–1 h), 1 ± 0.3 (1–2 h), 1 ± 0 (2–4 h), 14.3 ± 3.3 (4–24 h), and 18 ± 3.1 (cumulative)] into the PFA. E: percent change in food hoarding of non-food-deprived hamsters of the BW group injected with vehicle [absolute values: 0 ± 0 (0–1 h), 1 ± 0.7 (1–2 h), 3 ± 2.3 (2–4 h), 1 ± 0.7 (4–24 h), and 5 ± 3.2 (cumulative)] and Y1 antagonist [absolute values: 0 ± 0.7 (0–1 h), 2 ± 1.3 (1–2 h), 2 ± 0.7 (2–4 h), 1 ± 0 (4–24 h), and 5 ± 1.7 (cumulative)] into the PVH. F: percent change in food hoarding of non-food-deprived hamsters of the BW group injected with vehicle [absolute values: 1 ± 0 (0–1 h), 1 ± 0.3 (1–2 h), 1 ± 0.7 (2–4 h), 3 ± 2.3 (4–24 h), and 6 ± 3.9 (cumulative)] and Y1 antagonist [absolute values: 1 ± 0.7 (0–1 h), 1 ± 0.7 (1–2 h), 3 ± 2.3 (2–4 h), 4 ± 1.5 (4–24 h), and 9 ± 2.9 (cumulative)] into the PFA. Values are means ± SE. *P < 0.05 vs. non-food-deprived hamsters. +P < 0.05 vs. PVH.