Figure 4.
Effects of desipramine on responding (as a percentage of the local control rate) for 2-pellets (upper panels) or 10-pellets (lower panels) expressed as a function of control rate. Control rate and drug rates (expressed as drug rate/control rate × 100) are log transformed. Each subject is represented by a the same unique color used in Figure 3. Control rates and drug effects equal to zero resp/sec were excluded from the plot and analysis. The line represents the linear mixed-effects regression for each panel.