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. Author manuscript; available in PMC: 2010 Jan 8.
Published in final edited form as: Psychopharmacology (Berl). 2008 Sep 3;201(4):495–506. doi: 10.1007/s00213-008-1313-6

Figure 1.

Figure 1

Mean (± s.e.m.) percentage changes in the M-50 (top) and theta-0 (middle) measures of reward threshold and maximum reinforcement rate (bottom), derived from self-stimulation rate-frequency curves, 10 min following intraperitoneal injection of d-amphetamine (0.5 mg/kg) or vehicle in ad libitum fed (black fill) and food-restricted (gray fill) rats. These injections were preceded, 30 min earlier, by intraperitoneal injection of SL-327 (50 mg/kg) or DMSO vehicle. **p<.001 compared to AL subjects; *p<.02 compared to AL subjects; #p<.02 compared to vehicle pretreatment.