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Log response- and time-allocation ratios plotted as a function of log injection ratios with concurrent 0.3 and 0.1 µg/kg/inj remifentanil. Squares represent log ratios of behavior with 0.3 µg/kg/inj remifentanil on the left lever and 0.1 µg/kg/inj remifentanil on the right and circles represent the lever reversal. Asterisks and crosses indicate significant differences in bias (log b) and sensitivity (a), respectively, following a lever reversal. Other details are as in Figure 3.
