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. Author manuscript; available in PMC: 2020 Apr 1.
Published in final edited form as: Neuropharmacology. 2019 Jan 3;148:139–150. doi: 10.1016/j.neuropharm.2018.12.031

Figure 2.

Figure 2.

Exponential demand curves for nicotine, sucrose, and their comparison (N=21). Critical demand values are found below each panel showing demand curves. SD - standard deviation. (A) A group-level comparison of demand curves for nicotine and sucrose. (B) A scatter plot and a linear fit of individual demand for nicotine and sucrose. Individual demand is presented as individual “essential values” that were derived from the nonlinear least squares regression model fit to the individual consumption data. (C) Exponential demand curves for subject with highest and lowest essential values for sucrose. (D) Exponential demand curves for subject with highest and lowest essential values for nicotine.