Modern Darwinian literary studies arose in part as a result of its proponents' dissatisfaction with the poststructuralist and postmodernist philosophies that had come to dominate literary study during the 1970s and 1980s. In particular, the Darwinists took issue with the argument that discourse constructs reality. The Darwinists argue that biologically grounded dispositions constrain and inform discourse. This argument runs counter to what evolutionary psychologists assert is the central idea in the "Standard Social Science Model": that culture wholly constitutes human values and behaviors.