Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Mean (± SEM) values of α and Q0 derived from fits of the exponential demand model to individual subjects’ consumption data. The upper and lower panels present these estimates for cocaine and saccharin, respectively, for each of the three groups. * indicates p < 0.05 ** indicates p < 0.01
