Is Hunger Drive Held Constant in the Behavior Experiment Employing a Fixed Food-Deprivation Schedule?

Body-weight curves based on 4 fixed-amount and 4 fixed-time maintenance schedules are reported. An examination of the literature, using those curves as criteria, suggests an unequivocal “no” to the question posed in the title of this paper. The same curves can serve as one basis for more knowledgably designed experiments in which fixed-deprivation schedules are deemed necessary or convenient.