LOUIS ALTHUSSER builds on the work of Jacques Lacan to understand the way ideology functions in society. He thus moves away from the earlier Marxist understanding of ideology. In the earlier model, ideology was believed to create what was termed "false consciousness," a false understanding of the way the world functioned (for example, the suppression of the fact that the products we purchase on the open market are, in fact, the result of the exploitation of laborers). Althusser explains that for Marx "Ideology is [...] thought as an imaginary construction whose status is exactly like the theoretical status of the dream among writers before Freud. For those writers, the dream was the purely imaginary, i.e. null, result of the 'day's residues'" (Lenin 108). Althusser, by contrast, approximates ideology to Lacan's understanding of "reality," the world we construct around us after our entrance into the symbolic order.
For Althusser, as for Lacan, it is impossible to access the "Real conditions of existence" due to our reliance on language; however, through a rigorous"scientific" approach to society, economics, and history, we can come close to perceiving if not those "Real conditions" at least the ways that we are inscribed in ideology by complex processes of recognition.