All this puts us in the position of grasping schizophrenia as a break-down of the relationship between signifiers. For Lacan, the experience of temporality, human time, past, present, memory, the persistence of personal identity over months and years- this existential or experiential feeling of time itself- is also an effect of language. It is because language has a past and a future, because the sentence moves in time, that we can have what seems to us a concrete or lived experience in time. But since the schizophrenic does not know language articulation in that way, he or she does not have our experience of temporal continuity either, but is condemned to live a perpetual present with which various moments of his or her past have little connection and for which there is no conceivable future on the horizon. In other words, schizophrenic experience is an experience of isolated, disconnected, discontinuous material signifiers which fail to link up into a coherent sequence. The schizophrenic thus does not know personal identity in our sense, since our sense of identity depends on our sense of the persistence of the "I" and the "me" over time
Fredric Jameson, "Postmodernism and the Consumer Society"