Drug-induced shifts of the reward mountain along the pulse-frequency axis.

The “ Drg” and “ Veh” columns list the common logarithms of the values in the “ Drg” and “ Veh” columns of S7 Table. The “diff” column shows the differences between the estimates for the drug and vehicle conditions. The “diff Lo” and “diff Hi” columns designate the lower and upper bounds of the 95% confidence interval surrounding these differences. The “⋆” character in the “excl 0” column indicates that zero falls outside the 95% confidence interval surrounding the estimates in the“diff” column. Differences so designated meet our criterion for statistical reliability. The rightmost column lists the value of in Eqs S13,S14,S44 implied by the values in the “diff” column.