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Soon the same mechanism finds a fresh application. The process of repression, as we know, is not yet completed, and it finds a further aim in the task of inhibiting the development of the anxiety which arises from the substitute. This is achieved by the whole of the associated environment of the substitutive idea being cathected with special intensity, so that it can display a high degree of sensibility to excitation. Excitation of any point in this outer structure must inevitably, on account of its connection with the substitutive idea, give rise to a slight development of anxiety; and this is now used as a signal to inhibit, by means of a fresh flight on the part of the cathexis, the further progress of the development of anxiety. The further away the sensitive and vigilant anticathexes are situated from the feared substitute, the more precisely can the mechanism function which is designed to isolate the substitutive idea and to protect it from fresh excitations. These precautions naturally only guard against excitations which approach the substitutive idea from outside, through perception; they never guard against instinctual excitation, which reaches the substitutive idea from the direction of its link with the repressed idea. Thus the precautions do not begin to operate till the substitute has satisfactorily taken over representation of the repressed, and they can never operate with complete reliability. With each increase of instinctual excitation the protecting rampart round the substitutive idea must be shifted a little further outwards. The whole construction, which is set up in an analogous way in the other neuroses, is termed a phobia. The flight from a conscious cathexis of the substitutive idea is manifested in the avoidances, renunciations and prohibitions by which we recognize anxiety hysteria.