As structuralist linguistics gave way to a post-structuralist philosophy of language which denied the scientific ambitions of the general theory of signs, semiotic literary criticism became more playful and less systematic in its ambitions. Still, some authors harbor more scientific ambition for their literary schemata than others. Later authors in the semiotic tradition of literary criticism include Tzvetan Todorov, Mikhail Bakhtin, Roland Barthes, Juri Lotman, Julia Kristeva, Michael Riffaterre, and Umberto Eco.