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In the second half of the twentieth century, however, such seemingly self-evident or logical claims to identity have been problematised radically on a number of fronts by such theorists as Louis Althusser, Sigmund Freud, Ferdinand de Saussure, Jacques Lacan and Michel Foucault. Collectively, their work has made possible certain advances in social theory and the human sciences which, in the words of Stuart Hall (1994:120), have effected 'the final de-centring of the Cartesian subject' (cf. Chris Weedon, 1987; Diana Fuss, 1989; Barbara Creed, 1994). Consequendy, identity has been reconceptualised as a sustaining and persistent cultural fantasy or myth. To think of identity as a 'mythological' construction is not to say that categories of identity have no material effect. Rather it is to realise—as Roland Barthes does in his Mythologies (1978)—that our understanding of ourselves as coherent, unified, and self-determining subjects is an effect of those representational codes commonly used to describe the self and through which, consequendy, identity comes to be understood.
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