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. Author manuscript; available in PMC: 2009 Oct 1.
Published in final edited form as: Psychopharmacology (Berl). 2008 May 29;200(2):167–176. doi: 10.1007/s00213-008-1191-y

Figure 3.

Figure 3

Effects of daily pretreatment with MPEP (a, left), dizocilpine (b, right) or their vehicles (points over “V”) on reinforcers/session under the fixed-ratio schedule of i.v. cocaine injections or food pellet deliveries. For each monkey, intake (injections/session or pellets/session) was converted to a percent of baseline intake (i.e., intake after saline injection). Data are means (± SEM) based on data from groups of 4 monkeys. Asterisks indicate significant reductions in intake after MPEP or dizocilpine pretreatment compared to vehicle pretreatment.