Confirmation bias
From a recent Amazon.com reader review of The Conscious Universe . This review provides a nice demonstration of the confirmation bias: If you believe that psi does not exist, but then you encounter evidence indicating that psi does exist, the confirmation bias will cause you to find reasons to reject the positive evidence, which in turn will make you more convinced -- and hence confirms -- that your original hypothesis was correct. Because this bias is rife throughout science, I discuss it and other biases in The Conscious Universe . Incidentally, I doubt that the reviewer read the book carefully, because I never, ever use the term PSI. The correct word is psi. The reviewer writes (excerpt): The main reason why I found this book unconvincing is that if PSI existed it would be easy to demonstrate. No meta-analysis of a huge number of studies is needed, one good experiment suffices. This argument might seem appealing, except for one very important problem: Human performance is highly