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. Author manuscript; available in PMC: 2009 Jan 1.
Published in final edited form as: Neurosci Biobehav Rev. 2007 May 18;32(1):20–39. doi: 10.1016/j.neubiorev.2007.04.019

Figure 8.

Figure 8

Extracellular DA (upper graph) decreased to 81% of baseline after naloxone injection (3 mg/kg, s.c.) in rats with a history of Daily Intermittent Sucrose and Chow. Acetylcholine (lower graph) increased to 157% in the same intermittent sugar-access rats. No effects were seen in a control group with Ad libitum Chow followed by a naloxone injection. *p<0.05, **p<0.01. From Colantuoni et al., 2002.