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. Author manuscript; available in PMC: 2016 Sep 1.
Published in final edited form as: Psychopharmacology (Berl). 2015 Jun 4;232(18):3309–3318. doi: 10.1007/s00213-015-3983-1

Figure 6.

Figure 6

Effects of oxycodone, 2-BFI, phenyzoline and drug combinations on rate of food-maintained responding (filled circles) in rats responding under a fixed ratio 10 schedule of food presentation. The anti-hyperalgesic effects (open circles) of these drugs were also plotted as a comparison. Ordinate, percentage effect in correspondence to percentage of control responding rate (filled circles) or percentage of maximal possible effect (open circles); Abscissa, dose of drug (milligrams per kilogram). * P < 0.05 as compared to vehicle responding rate.