David Dibattista

Learn More
The available body of scientific evidence does not support the notion that sugar consumption has significant adverse effects on children's behaviours; however, responses to a mailed questionnaire indicated that more than 80% of 389 Canadian primary school teachers believed that sugar consumption contributes to increasing activity of normal children and to(More)
Because multiple-choice testing is so widespread in higher education, we assessed the quality of items used on classroom tests by carrying out a statistical item analysis. We examined undergraduates’ responses to 1198 multiple-choice items on sixteen classroom tests in various disciplines. The mean item discrimination coefficient was +0.25, with more than(More)
Adult male golden hamsters with continuous access to Purina chow, water and either 15, 30 or 45% ethanol (v/v) for 14 weeks derived an average of 34, 37 and 22%, respectively, of their total calories from ethanol. Animals in the 15 and 45% ethanol groups derived up to 12.0 and 9.9 kcal/day, respectively, from ethanol, but the Purina chow intakes of these(More)
Specific appetites for protein and carbohydrate were investigated by allowing mice and rats time-restricted access to either protein or carbohydrate. Animals were maintained over a period of weeks on a self-selection regimen consisting of three separate macronutrient sources (carbohydrate, fat, and protein). After a baseline phase during which all three(More)
Golden hamsters housed in operant chambers over a period of weeks had ad lib access to a maintenance diet that was either nutritionally complete (NCMD) or protein-free (PFMD), and they were required to press a lever on a fixed-ratio (FR) schedule to obtain 20-mg high-protein pellets. As the FR requirement increased, hamsters maintained on the NCMD made(More)
Adult male golden hamsters, which are avid consumers of ethanol solutions, were maintained on powdered Purina chow and tap water, and they were permitted continuous access to either a 15% or a 30% ethanol solution (v/v). In two experiments, the effect of chronic dietary energy shortage on ethanol consumption was examined. Energy shortage was produced either(More)
Adult male golden hamsters were maintained on either Purine Rat Chow (Chow diet) or a self-selection diet consisting of high-protein chow, pure fat, and pure carbohydrate (Choice diet). In Experiment 1, animals were deprived of food for single periods of up to 48 hr. Animals on the Chow diet did not increase intake at any time after deprivation; animals on(More)
Two experiments were performed to investigate whether insulin-induced hyperphagia (IIH) serves an adaptive function in counteracting hypoglycemia in hamsters. In Experiment 1, insulin-injected hamsters having free access to food during a six-hour feeding test had neither higher plasma glucose (PG) concentrations nor lower frequencies of neurological(More)
In Experiment 1, golden hamsters were injected with either 0.9% saline or the nausea-inducing agent, lithium chloride (LiCL), immediately after consuming a flavored diet that was either novel or familiar. The LiCl-induced aversion was strong in hamsters for which the flavored diet was novel, but no significant aversion was observed in hamsters that were(More)
Because adult rats have very low levels of the intestinal enzyme lactase, the ingestion of appreciable quantities of the disaccharide lactose may cause gastrointestinal distress. The present experiment was designed to demonstrate that adult rats will learn to avoid previously neutral stimuli which have been paired with lactose ingestion. Adult rats ingested(More)