Operant Chamber Experiments

The operant chamber is a small experimental space or cage that Skinner invented to observe the effects that consequences have on behavior. A food-deprived organism (Skinner first used rats and later switched to pigeons) is placed in the chamber containing a lever that, when depressed, releases a small piece of food into a cup from which the organism eats. The first barpress response is produced through the process of shaping, or reinforcing approximations to bar pressing (for example, being near the bar, having a paw above the bar, resting a paw on the bar, nearly depressing the bar) until bar pressing is regularly occurring. Once the operant of bar pressing is established, an experimental analysis of the variables which influence it can be done. The schedule of reinforcement can be changed, for example, from one reinforcer for each response to five responses required for each rein-forcer. Changes in the rate of response can be observed on a device Skinner invented, a cumulative record, which automatically displays the rate at which the operant is occurring. A discriminative stimulus can be introduced in the form of a small light mounted on the wall of the chamber. If bar presses are reinforced only when the light is turned on, the light will come to have some control over the operant. Turning the light on and off will literally turn bar pressing on and off in a food-deprived rat.

Skinner controlled his own behavior in the same fashion that he had learned to control the behavior of laboratory organisms. He arranged a "writing environment," a desk used only for that purpose; wrote at a set time each day; and would keep careful records of time spent writing. Other examples of self-management may be found in Skinner's novel of his research, Walden Two (1948). In this fictionalized account, children learn self-control through a set of exercises that teach ways to tolerate increasing delays of reinforcement.

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Breaking Bulimia

Breaking Bulimia

We have all been there: turning to the refrigerator if feeling lonely or bored or indulging in seconds or thirds if strained. But if you suffer from bulimia, the from time to time urge to overeat is more like an obsession.

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