Learning has been said to increase with practice ever since the early experiments by Thorndike. This idea has not only been intuitively appealing to both laymen and scientists alike, but it can also be demonstrated empirically in the group-learning curve. When a person is to learn a series of associations, there must be a repetition of trials whereupon the two elements that are to be associated are presented together. Just how the strength of the association increases through repetition has sparked some controversy recently as well as in the past
