Researchers Will Gervais and Ara Norenzayan devised a series of experiments to test if analytic thinking may be a source of religious disbelief. In the first trial, the subjects answered questions designed to measure their cognitive state and completed three surveys to measure the strength of their faith. Then, to test for causation, the authors also conducted experiments where they first primed the participants into thinking more methodically with images of Rodin's The Thinker or a word-scrabble game with words like "think," "ponder," or "rational."