George trains a pigeon to peck a disk by reinforcing each disk peck. Once the response is learned, George begins to cut back on the reinforcers. At first he reinforces every other response, then every third response, every fifth response, every tenth response, and so on. Things are going pretty well for George until he jumps from reinforcing every tenth response to reinforcing every 50th response. At this point, the pigeon responds erratically and nearly stops responding entirely. George's pigeon is suffering from .