A recently released paper by Andrew Clifton proposes that the Turing test does not provide a valid criterion for the presence of consciousness. Imagine a "Turing Test" in which the interrogators must be convinced that the participant is a normally sighted individual. A blind person might pass by successfully lying about the visual sensations experienced by sighted persons. According to Clifton, this means an intelligent enough computer could pass a Turing test by lying about being conscious. He then goes on to attempt to define consciousness and propose a test for it that he calls the "Introspection Game".