 Thus, in one respect, sensation always precedes apperception, namely insofar as all representations and their groupings originate in sensory disturbances (SW VI: 143). Yet genuine perception, even of sensa, depends in turn on apperception, for only apperception allows us to attend to the sensed “as” or “in terms of” the apperceiving mass to which it is being assimilated (Stout 1888b: 485, f., §29). As we saw in Section 3.7.2, this is just to say that we need a representational mass called a “concept” in order to recognize a new representation as an instance of it, and thus in the full sense to perceive it at all.