  Despite this, some critics have suggested the overlap mechanism is surplus to requirements. Gallagher (2003) is unable to find any trace of the alleged overlaps between specious presents in his own experience, and concludes that the account is phenomenologically suspect. The Overlap theorist can respond by arguing that the seamless continuity, lasting for minutes or hours, that we find in our streams of consciousness is itself evidence for the proposed overlap structure, since the latter is responsible for the continuity in question: