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. Author manuscript; available in PMC: 2013 Jan 1.
Published in final edited form as: Psychopharmacology (Berl). 2011 Nov 5;219(2):353–362. doi: 10.1007/s00213-011-2552-5

Fig. 2.

Fig. 2

Intervals produced per hour (top), reinforcers collected per hour (middle), and proportion of correct intervals produced (bottom) by Groups Lever (left) and Head (right), and Groups Paired (filled symbols) and Isolated (open symbols), at each dose of MPH. Asterisk significant effect of MPH dose, number sign significant effect of housing; α=0.05. Doses of 0.5 and 2 mg/kg MPH in Group Lever and of 2 mg/kg in Group Head significantly increased the number of intervals per hour relative to lower doses (p=0.012, 0.023 and 0.012, respectively). In Group Head, 0.5 and 2 mg/kg MPH significantly increased the number of reinforcers collected per hour (p=0.04, p=0.025), and isolated housing increased the proportion of correct intervals (p=0.035)