In conscious life, we achieve some sense of ourselves as reasonably unified, coherent selves, and without this action would be impossible. But all this is merely at the ‘imaginary’ level of the ego, which is no more than the tip of the iceberg of the human subject known to psychoanalysis. The ego is function or effect of a subject which is always dispersed, never identical with itself, strung out along the chains of the discourses which constitute it. There is a radical split between these two levels of being — a gap most dramatically exemplified by the act of referring to myself in a sentence. When I say ‘Tomorrow I will mow the lawn,’ the ‘I’ which I pronounce is an immediately intelligible, fairly stable point of reference which belies the murky depths of the ‘I’ which does the pronouncing. The former ‘I’ is known to linguistic theory as the ‘subject of the enunciation’, the topic designated by my sentence; the latter ‘I’, the one who speaks the sentence, is the ‘subject of the enunciating’, the subject of the actual act of speaking. In the process of speaking and writing, these two ‘I’s’ seem to achieve a rough sort of unity; but this unity is of an imaginary kind. The ‘subject of the enunciating’, the actual speaking, writing human person, can never represent himself or herself fully in what is said: there is no sign which will, so to speak, sum up my entire being. I can only designate myself in language by a convenient pronoun. The pronoun ‘I’ stands in for the ever-elusive subject, which will always slip through the nets of any particular piece of language; and this is equivalent to saying that I cannot ‘mean’ and ‘be’ simultaneously. To make this point, Lacan boldly rewrites Descartes’s ‘I think, therefore I am’ as: ‘I am not where I think, and I think where I am not.

~ Terry Eagleton

Lacan, as we have seen in our discussion of Freud, regards the unconscious as structured like a language. This is not only because it works by metaphor and metonymy: it is also because, like language itself for the post-structuralists, it is composed less of signs — stable meanings — than of signifiers. If you dream of a horse, it is not immediately obvious what this signifies: it may have many contradictory meanings, may be just one of a whole chain of signifiers with equally multiple meanings. The image of the horse, that is to say, is not a sign in Saussure’s sense - it does not have one determined signified tied neatly to its tail - but is a signifier which may be attached to many different signifieds, and which may itself bear the traces of the other signifiers which surround it. (I was not aware, when I wrote the above sentence, of the word-play involved in ‘horse’ and ‘tail’: one signifier interacted with another against my conscious intention.) The unconscious is just a continual movement and activity of signifiers, whose signifieds are often inaccessible to us because they are repressed. This is why Lacan speaks of the unconscious as a ‘sliding of the signified beneath the signifier’, as a constant fading and evaporation of meaning, a bizarre ‘modernist’ text which is almost unreadable and which will certainly never yield up its final secrets to interpretation.

~ Terry Eagleton