Of course, to point to the similarity between suggestion and attention is not a real explanation. It may be answered that attention simply offers the same difficulties once more. How can we explain in the attention process the fact that one idea, the one attended to, becomes vivid and that others evaporate? The difficulty evidently cannot be removed by simply saying that only one sensorial process can be developed in the brain at one time. The popular descriptions of attention easily make it appear as if such were the solution of the problem. If one sensorial brain part is intensely engaged, the remainder of the brain is condemned to a kind of inactivity. Yet such a dogma is hardly better than the old-fashioned one that the soul can have only one idea at a time. We know too well now that the psychophysical system is an extremely complex equilibrium of millions of elements. Thus every change must be explained with reference to this complex manifold. Above all, the facts simply contradict such an over-simple explanation, inasmuch as it is not at all true that only one content of consciousness can become vivid. Our attention does not focus upon one point at all but may illuminate a large field and thus give vividness to various complex groups. If I am thinking about a scientific problem, an abundance of reminiscences of previous reading and imaginative ideas of possible solutions, associative thoughts and conclusions are with equal vividness before my mind and the forthcoming thought may be influenced by this total combination. I have no right whatever to say that the idea of a certain solution excludes there in my mind the consideration of the books which I have read and of the discussions which I have heard. Emotions may be superadded. In short, a world of mental states may be held together by one act of attention. And new and ever new thoughts are shooting in, and all still find place there in the field attended to, while on the other hand my slight headache is inhibited and an appointment is forgotten. At a gay banquet, my attention may be given to the whole hall with all its color effects and its flowers, and to all that the table offers and to the music from the orchestra and to the jokes of my neighbors. It is not true that any one of those parts suppresses the vividness of the others, they seem rather to maintain and to help one another; and yet in the next moment, my neighbor may bring me news which absorbs my mind entirely and leaves no room for the flowers and the music and the meal. How far can psychology do justice to these characteristics of attention?