ABSTRACT
When one is unable to explain the basic mechanisms of such an elusive phenomenon as mind, as the behaviorists claim we cannot, how very satisfying it is at least to be able to study the dynamics of change in that phenomenon. That portion of the problem that is not understood is at least held constant, and that part (the dynamics of variation) that is measurable becomes preeminent. Furthermore, learning per se has enormous intrinsic interest. It represented (incorrectly as it turned out) to early twentieth century psychologists one of the main features that distinguishes man from the lower species. Knowledge about learning behavior also possesses enormous practical implications considering the huge investment of time and money in education made by all societies, primitive or modern.
