 Right here in this video is over a beta of effect. Now a beta effect is a decrease in current frequency of a behavior that has been reinforced by a stimulus that is increased in reinforcing effectiveness by the same motivating operation. After teaching the first letter of the alphabet, say A, piece of food, and continuing to teach the alphabet, B, food, C, food, behavior will start to decrease in acquisition because satiation and the beta effect of continuing to use food as the reinforcer.