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. Author manuscript; available in PMC: 2011 Apr 1.
Published in final edited form as: Addiction. 2010 Feb 9;105(4):727–731. doi: 10.1111/j.1360-0443.2009.02858.x

Figure 1.

Figure 1

Dose response functions for number of capsules earned on the modified progressive ratio procedure during self-administration sessions (Top Panel); subject ratings of Like Drug (Middle Panel); and Wiling to Take Again (Bottom Panel) from the Drug-Effect Questionnaire collected during sampling sessions. X-axes: d-Amphetamine dose. Data points show means of 10 women (circles) and 15 men (squares). Data points above PL represent placebo. Filled symbols indicate the data point is significantly different from the corresponding placebo value. An asterisk indicates that women and men were significantly different from each other at that dose. Unidirectional brackets represent one standard error of the mean.