Substitution and caloric regulation in a closed economy.
Animals treat imperfect reinforcers like diet soda: they cut the main item but guard total payoff, so clinicians must control overall value, not just availability.
01Research in Context
What this study did
Bauman et al. (1996) let rats and monkeys live in a closed economy.
The animals could eat their usual food or nibble an imperfect substitute.
The team watched how total calories and body weight changed.
What they found
When the substitute snack was free, animals ate less of the main food.
Yet their daily calories and weight stayed the same.
The result shows built-in calorie regulation even with junk food around.
How this fits with other research
Killeen (1978) ran a similar closed-economy study with pigeons and rats.
That paper showed choice shifts when goods can or cannot swap.
Bauman et al. (1996) move the idea forward by proving the body guards total energy.
Webb et al. (1999) later took the same concurrent-choice trick to feeding therapy.
They let preschoolers pick bite-plus-reinforcer pairs at the lunch table.
The kids, like the rats, chased the better deal and kept intake steady.
Together the chain shows: substitution logic works from lab cages to clinic seats.
Why it matters
You can map this calorie-defense rule onto client behavior.
If a child can earn cheap edibles or screen time, they may drop the hard task but still fill their reinforcer quota.
Keep the unit price of target responses low and make the clinical reinforcer the best calorie or sensory deal in the room.
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Join Free →Run a two-choice probe: keep the functional reinforcer rich and raise the cost of the substitute so the client stays with the target response.
02At a glance
03Original abstract
Three experiments were conducted to study the effect of an imperfect substitute for food on demand for food in a closed economy. In Experiments 1 and 2, rats pressed a lever for their entire daily food ration, and a fixed ratio of presses was required for each food pellet. In both experiments, the fixed ratio was held constant during a daily session but was increased between sessions. The fixed ratio was increased over a series of daily sessions once in the absence of concurrently available sucrose and again when sucrose pellets were freely available. For both series, increases in the fixed ratio reduced food intake, but body weight was reduced only in the no-sucrose condition. In the sucrose condition, body weight and total caloric intake (sucrose plus food) were relatively unaffected by increases in the fixed ratio. At all fixed ratios, food intake was proportionally reduced by the intake of sucrose. In Experiment 3, monkeys obtained food or saccharin by pressing keys; the fixed ratio of presses per food pellet was increased once when tap water was each monkey's only source of fluid, again when each monkey's water was sweetened with saccharin, and a third time when each monkey had concurrent access to the saccharin solution and plain water. Increases in the fixed ratio, but not the intake of the saccharin solution, reduced each monkey's food intake. Because neither rats' sucrose nor monkeys' saccharin intakes affected the slope of the respective demand curves for food, monkeys and rats increased their daily output of presses and thereby defended their daily intake of those complementary elements of food. However, sucrose reduced rats' food intake. The relative constancy of body weight and total caloric intake in the sucrose condition is consistent with the possibility that rats tended to regulate caloric intake.
Journal of the experimental analysis of behavior, 1996 · doi:10.1901/jeab.1996.65-401