In the preceding volume of this Course, entitled "The TrainedMemory," you learned that the memory process involves fourelements, Retention, Recall, Recognition and Imagination; and thescope and operation of two of these elements, Retention andRecall, were explained to you.
There remain Recognition and Imagination, which we shall make thesubject of this book. We shall treat of them, however, not onlyas parts of the memory process, but also as distinct operations,with an individual significance and value.
Both Recognition and Imagination have to do with mental images.