Depending then satisfaction is that it will enter the Freudian psychic apparatus the reality principle, entering as a sign, a sign by which one can discriminate a perception from the outside world of a hallucination. This sign is set by the difference of the amount of load stimulus. The presence of a is directly correlated with an elevation of cargo, the perception of an exogenous stimulus is immediate correlate a discharge process, a quality that is pleasant, when this process is evident in W is set motor discharge operation. The role of the trial is responsible for establishing such discrimination, then when two cathexes not match is put into operation the activity of thought, when this coincidence occurs cogitative processes are completed.
Differences are achieved in repeating the experience of satisfaction which opens a gap, a loss, a failure that triggered the thought, so the reality principle is to connect to the outside world with wishful objects according to the need But the service of wish-fulfillment. Freud exemplifies the process as follows: in a first step, assuming that the visual impression of an object in the act of an infant nutrition, outside the lateral view at the breast without the nipple (a), this will correspond a reflex (b). If a second half against a new strain generated by necessity, left to meet a frontal image of the object, ie viewed from the front chest (d) to receive the image again side of the chest, you need a nod from the infant (c) motion was not made during the course of the first experience, which to be achieved by c.
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