καμια φορα οι καλοκαιρινες νυχτες είναι ακουστικες**

A subject was placed in the box, and the mechanism gave small amounts of food each time the subject performed a particular action, such as depressing a lever or pecking a disk. With the operant conditioning chamber attached to a recording device, Skinner was able to discover schedules of reinforcement. These patterns are the basis for organismic interactions with the environment and are explored extensively in Schedules of Reinforcement and elsewhere.