Abstract
4 white rats were reinforced on a fixed-interval I-min. schedule with 45-mg Noyes pellets either of regular formula (containing 7.5% glucose), sugarless, or containing 4 % or 32 % sucrose by weight. Water, saccharin (0.4% in water), alcohol (5.0 w/v in saccharin), or nothing was available to drink. There were significant effects of pellet and fluid types on schedule-induced drinking, with regular pellets inducing largest intakes of all fluids and saccharin intakes exceeding other fluids with all pellets. Pellet effects occurred more through differences in percentages of pellets that occasioned drinks than by volumes of fluid consumed per drink. Only alcohol drinking declined within sessions, and barpress rates were highest when there was nothing to drink.
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