Influence Science and Practice

For both humans and subhumans, the automatic behavior patterns tend to be triggered by a single feature of the relevant information in the situation. This single feature, or trigger feature, can often prove very valuable by allowing an individual to decide on a correct course of action without having to analyze carefully and completely each of the other pieces of information in the situation.

The point is that the same thing—in this instance, room-temperature water—can be made to seem very different depending on the nature of the event that precedes it.

have recently become impressed by evidence suggesting that the form and pace of modern life is not allowing us to make fully thoughtful decisions, even on many personally relevant topics (Cohen, 1978; Milgram, 1970). That is, sometimes the issues may be so complicated, the time so tight, the distractions so intrusive, the emotional arousal so strong, or the mental fatigue so deep that we are in no cognitive condition to operate mindfully. Important topic or not, we have to take the shortcut.

Quite a lot of laboratory research has shown that people are more likely to deal with information in a controlled fashion when they have both the desire and the ability to analyze it carefully; otherwise, they are likely to use the easier click, whirr approach (Epley & Gilovich, 2006; Petty & Wegener, 1999). For instance, in one study (Petty, Cacioppo, & Goldman, 1981), students at the University of Missouri listened to a recorded speech that supported the idea of requiring all seniors to pass comprehensive examinations before they would be allowed to graduate. The issue affected some of them personally, because they were told that the exams could go into effect in the next year—before they had the chance to graduate. Of course, this news made them want to analyze the arguments carefully. However, for other subjects in the study, the issue had little personal importance—because they were told that the exams would not begin until long after they had graduated; consequently, they had no strong need to carefully consider the argument’s validity. The study’s results were quite straightforward: Those subjects with no personal stake in the topic were primarily persuaded by the speaker’s expertise in the field of education; they used the “If an expert said so, it must be true” rule, paying little attention to the strength of the speaker’s arguments. Those subjects for whom the issue mattered personally, on the other hand, ignored the speaker’s expertise and were persuaded primarily by the quality of the speaker’s arguments.

This parallel form of human automaticity is aptly demonstrated in an experiment by social psychologist Ellen Langer and her co-workers (Langer, Blank, & Chanowitz, 1978). A well-known principle of human behavior says that when we ask someone to do us a favor we will be more successful if we provide a reason. People simply like to have reasons for what they do (Bastardi & Shafir, 2000). Langer demonstrated this unsurprising fact by asking a small favor of people waiting in line to use a library copying machine: “Excuse me, I have five pages. May I use the Xerox machine because I’m in a rush?” The effectiveness of this request plus-reason was nearly total: 94 percent of those asked let her skip ahead of them in line. Compare this success rate to the results when she made the request only: “Excuse me, I have five pages. May I use the Xerox machine?” Under those circumstances only 60 percent of those asked complied. At first glance, it appears that the crucial difference between the two requests was the additional information provided by the words because I’m in a rush. However, a third type of request tried by Langer showed that this was not the case. It seems that it was not the whole series of words, but the first one, because, that made the difference. Instead of including a real reason for compliance, Langer’s third type of request used the word because and then, adding nothing new, merely restated the obvious: “Excuse me, I have five pages. May I use the Xerox machine because I have to make some copies?” The result was that once again nearly all (93 percent) agreed, even though no real reason, no new information was added to justify their compliance. Just as the cheep-cheep sound of turkey chicks triggered an automatic mothering response from mother turkeys, even when it emanated from a stuffed polecat, so the word because triggered an automatic compliance response from Langer’s subjects, even when they were given no subsequent reason to comply.