by explicit attention when the devotion of conscious attention to the pattern alters the content or timing of that pattern itself. This phenomenon is especially pronounced in situations that feature high upside and/or downside risk and impose the associated psychological stress on one's conscious mind; one's performance in these situations may either a) be unimpaired or even enhanced ("flow") or b) deteriorate ("choke"). This effect has been named the "centipede effect" after the fable of the "Centipede's dilemma", where a toad immobilises a centipede simply by asking it how it walks. The centipede's normally unconscious locomotion was interrupted by conscious reflection on it. The psychologist George Humphrey referred to this parable in his 1923 The story of man's mind: "No man skilled at a trade needs to put his constant attention on the routine work," he wrote. "If he does, the job is apt to be spoiled." Use to influence In Influence, Robert Cialdini's book about social psychology and influence tactics, Cialdini explains how common automatic response patterns are in human behavior, and how easily they can be triggered, even with erroneous cues. He describes an experiment conducted by social psychologists Langer, Chanowitz, and Blank which illustrates how compliant people will be with a request if they hear words that sound like they are being given a reason, even if no actual reason is provided. The experimenters approached people standing in line to use a photocopier with one of three requests: "Excuse me. I have 5 pages. May I use the Xerox machine because I'm in a rush?" "Excuse me. I have 5 pages. May I use the Xerox machine?" "Excuse me. I have 5 pages. May I use the Xerox machine because I have to make some copies?" When given the request plus a reason, 94% of people asked complied with the request. When given the request without a reason, only 60% complied. But when given the request with what sounds like a reason but isn't, compliance jumped back to 93%. Langer, Chanowitz, and Blank are convinced that most human behavior falls into automatic response patterns. However, when the request was made larger (20 pages instead of 5), subjects expected a sound reason before complying, as illustrated in the table. See also Habit (psychology) Habituation Neural adaptation Implicit memory Unconscious cognition Unconscious thought theory References Sources PhysioEx 6.0 – Peter Zao – Timothy Stabler – Greta Peterson – Lori