definite quantity, and which may have been withdrawn from the stream of
thought in Question by other aims. Another way in which such mental
streams are kept from consciousness is the following:--Our conscious
reflection teaches us that when exercising attention we pursue a
definite course. But if that course leads us to an idea which does not
hold its own with the critic, we discontinue and cease to apply our
attention. Now, apparently, the stream of thought thus started and
abandoned may spin on without regaining attention unless it reaches a
spot of especially marked intensity which forces the return of
attention. An initial rejection, perhaps consciously brought about by
the judgment on the ground of incorrectness or unfitness for the actual
purpose of the mental act, may therefore account for the fact that a
mental process continues until the onset of sleep unnoticed by
consciousness.

Let us recapitulate by saying that we call such a stream of thought a
foreconscious one, that we believe it to be perfectly correct, and that
it may just as well be a more neglected one or an interrupted and
suppressed one. Let us also state frankly in what manner we conceive
this presentation course. We believe that a certain sum of excitement,
which we call occupation energy, is displaced from an end-presentation
along the association paths selected by that end-presentation. A
"neglected" stream of thought has received no such occupation, and from
a "suppressed" or "rejected" one this occupation has been withdrawn;
both have thus been left to their own emotions. The end-stream of
thought stocked with energy is under certain conditions able to draw to
itself the attention of consciousness, through which means it then
receives a "surplus of energy." We shall be obliged somewhat later to
elucidate our assumption concerning the nature and activity of
consciousness.