Keeping in mind what we have learned from the examination of the positive and negative perversions, it becomes quite obvious that they can be referred to a number of "partial impulses," which are not, however, primary but are subject to further analysis. By an "impulse" we can understand in the first place nothing but the psychic representative of a continually flowing internal somatic source of excitement, in contradistinction to the "stimulus" which is produced by isolated excitements coming from without. The impulse is thus one of the concepts marking the limits between the psychic and the physical. The simplest and most obvious assumption concerning the nature of the impulses would be that in themselves they possess no quality but are only taken into account as a measure of the demand for effort in the psychic life. What distinguishes the impulses from one another and furnishes them with specific attributes is their relation to their somatic sources and to their aims.
The source of the impulse is an exciting process in an organ, and the immediate aim of the impulse lies in the elimination of this organic stimulus.
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