Judging People by Their Traits

Although we can learn some things about others by observing their physical characteristics and their nonverbal behaviors, to really understand them we will eventually need to know their personality traits. Traits are important because they are the basic language by which we understand and communicate about people. When we talk about other people, we describe them using trait terms. Our friends are “fun,” “creative,” and “crazy in a good way,” or “quiet,” “serious,” and “controlling.” The language of traits is a powerful one—indeed, there are over 18,000 trait terms in the English language.

Combining Traits: Information Integration

Let’s consider for a moment how people might use trait terms to form an overall evaluation of another person. Imagine that you have to describe two friends of yours, William and Frank, to another person, Rianna, who might be interested in dating one of them. You’ll probably describe the two men in terms of their physical features first, but then you’ll want to say something about their personalities. Let’s say that you want to make both William and Frank sound as good as possible to Rianna, but you also want to be honest and not influence her one way or the other. How would you do that? You would probably start by mentioning their positive traits—William is “intelligent” and “serious,” Frank is “fun” and “exciting.” But to be fair, you would also need to mention their negative traits—William sometimes seems “depressed,” and Frank can be “inconsiderate” (sometimes he doesn’t show up on time).

You might figure that Rianna will just combine whatever information you give her, perhaps in a mathematical way. For instance, she might listen to all the traits that you mention, decide how positive or negative each one is, and then add the traits together or average them. Research has found that people do exactly that, both for strangers and for people that they know very well (Anderson, 1974; Falconi & Mullet, 2003). Consider what might happen if you gave Rianna the following information:

• William is smart, serious, kind, and sad.

• Frank is fun, happy, selfish, and inconsiderate.

Rianna might decide to score each trait on a scale of +5 (very positive) to –5 (very negative). Once she has these numbers, she could then either add them together or average them to get an overall judgment.

Based on this scoring, Rianna would probably decide that she likes William more than Frank. Of course, different people might weight the traits in somewhat different ways, and this would lead different people to draw different impressions about William and Frank. But there is pretty good agreement among most people about the meaning of traits, at least in terms of the overall positivity or negativity of each trait, and thus most people would be likely to draw similar conclusions.

Now imagine that you later thought of some other new, moderately positive characteristics about William—that he was also “careful” and “helpful.” Whether you told her about them or not might depend on how you thought they would affect her overall impression of William. Perhaps these new traits would make Rianna like William more (after all, they do add new positive information about him). But perhaps they might make her like him less (if the new, moderately positive information diluted the existing positive impression she has already formed about him).

One way to think about this is to consider whether Rianna might be adding the traits together or averaging them. In our first example, it didn’t matter because the outcome was the same. But now it might—if she’s adding the traits together, then Rianna will probably like William more after she hears the new information, because new positive traits have been added to the existing sum score. If she is averaging the traits together, however, then Rianna will probably like him less than she did before, because the new, more moderate information tends to dilute the initial impressions.

It turns out that in most cases, our judgments are better predicted by mental averaging than by mental adding (Mills, 2007). What this means is that when you are telling someone about another person and you are trying to get them to like the person, say the most positive things that you know but leave out the more moderate (although also positive) information. The moderate information is more likely to dilute, rather than enhance, the more extreme information.

The Importance of the Central Traits Warm and Cold

Although the averaging model is quite good at predicting final impressions, it is not perfect. This is because some traits are simply weighted more heavily than others. For one, negative information is more heavily weighted than is positive information (Rozin & Royzman, 2001). In addition to the heavy weight that we give to negative traits, we give a particular emphasis to the traits “warm” and “cold.” Imagine two men, Brad and Phil, who were described with these two sets of characteristics:

• Brad is industrious, critical, warm, practical, and determined.

• Phil is industrious, critical, cold, practical, and determined.

As you can see, the descriptions are identical except for the presence of “warm” and “cold.” Solomon Asch (1946) found that people described with these two sets of traits were perceived very differently—the “warm” person very positively and the “cold” person very negatively.

To test whether or not these differences would influence real behavior, Harold Kelley (1950) had students read about a professor who was described either as “rather cold” or as “very warm.” Then the professor came into the classroom and led a 20-minute discussion group with the students. Although the professor behaved in the same way for both groups, the students nevertheless reacted very differently to him. The students who were expecting the “warm” instructor were more likely to participate in the discussion, in comparison with those who were expecting him to be “cold.” And at the end of the discussion, the students also rated the professor who had been described as “warm” as being significantly more humorous, sociable, popular, and better natured than the “cold” professor. Moreover, the effects of warmth and coolness seem to be wired into our bodily responses. Research has found that even holding a cup of hot, versus iced, coffee or making judgments in warm, versus cold, rooms leads people to judge others more positively (Ijzerman & Semin, 2009; Williams & Bargh, 2008).

In short, the particular dimension warm versus cold makes a big difference in how we perceive people—much bigger than do other traits. As a result, the traits of warm and cold are known as central traits (Asch, 1946). The powerful influence of central traits is due to two things. For one, they lead us to make inferences about other traits that might not have been mentioned. The students who heard that the professor was “warm” might also have assumed that he had other positive traits (maybe “nice” and “funny”), in comparison with those who heard that he was “cold.” Second, the important central traits also color our perceptions of the other traits that surround them. When a person is described as “warm” and “intelligent,” the meaning of “intelligent” seems a lot better than does the term “intelligent” in the context of a person who is also “cold.” Overall, the message is clear: If you want to get someone to like you, try to act in a warm manner toward them. Be friendly, nice, and interested in what they say. This attention you pay to the other will be more powerful than any other characteristics that you might try to display to them.

First Impressions Matter: The Primacy Effect

It has frequently been said that “first impressions matter.” Social psychological research supports this idea. Information that we learn first is weighted more heavily than is information that comes later. This is known as the primacy effect. One demonstration of the primacy effect was conducted by Solomon Asch (1946). In his research, participants learned some traits about a person and then made judgments about him. One half of the participants saw this list of traits:

• intelligent, industrious, impulsive, critical, stubborn, envious

The other half of the participants saw this list:

• envious, stubborn, critical, impulsive, industrious, intelligent

You may have noticed something interesting about these two lists—they contain exactly the same traits but in reverse order.

Asch discovered something interesting in his study: Because the traits were the same, we might have expected that both groups would form the same impression of the person, but this was not at all the case. Rather, Asch found that the participants who heard the first list, in which the positive traits came first, formed much more favorable impressions than did those who heard the second list, in which the negative traits came first. Similar findings were found by Edward Jones (1968), who had participants watch one of two videotapes of a woman taking an intelligence test. In each video, the woman correctly answered the same number of questions and got the same number wrong. However, when the woman got most of her correct answers in the beginning of the test but got more wrong near the end, she was seen as more intelligent than when she got the same number correct but got more correct at the end of the test.

Primacy effects also show up in other domains, even in those that seem really important. For instance, Koppell and Steen (2004) found that in elections in New York City, the candidate who was listed first on the ballot was elected more than 70% of the time, and Miller and Krosnick (1998) found similar effects for candidate preferences in laboratory studies.

This is not to say that it is always good to be first. In some cases, the information that comes last can be most influential. Recency effects, in which information that comes later is given more weight, although much less common than primacy effects, may sometimes occur. For example, Bruine de Bruin (2005) found that in competitions such as the Eurovision Song Contest and ice skating, higher marks were given to competitors who performed last.

Considering the primacy effect in terms of the cognitive processes central to human information processing leads us to understand why it can be so powerful. For one, humans are cognitive misers. Because we desire to conserve our energy, we are more likely to pay more attention to the information that comes first and less likely to attend to information that comes later. In fact, when people read a series of statements about a person, the amount of time they spend reading the items declines with each new piece of information (Belmore & Hubbard, 1987). Not surprisingly, then, we are more likely to show the primacy effect when we are tired than when we are wide awake and when we are distracted than when we are paying attention (webster, Richter, & Kruglanski, 1996).

Another reason for the primacy effect is that the early traits lead us to form an initial expectancy about the person, and once that expectancy is formed, we tend to process information in ways that keep that expectancy intact. This of course is a classic case of assimilation—once we have developed a schema, it becomes difficult to change it. If we learn that a person is “intelligent” and “industrious,” those traits become cognitively accessible, which leads us to develop an expectancy about the person. When the information about the negative features comes later, these negatives will be assimilated into the existing knowledge more than the existing knowledge is accommodated to fit the new information. Once we have formed a positive impression, the new negative information just doesn’t seem as bad as it might have been had we learned it first. On the other hand, if we learn the negatives first, the opposite happens—the positives don’t seem so positive when we get to them.

You can be sure that it would be good to take advantage of the primacy effect if you are trying to get someone to like you. Begin with your positive characteristics, and only bring the negatives up later. This will create a much better outcome than beginning with the negatives. And if your instructor is going to write a recommendation letter for you, she’ll likely do the same thing—she’ll put your good qualities first and save the poorer ones (if you have any!) for the second page of the letter.

References

Belmore, S. M., & Hubbard, M. L. (1987). The role of advance expectancies in person memory. Journal of Personality and Social Psychology, 53(1), 61–70.

Ijzerman, H., & Semin, G. R. (2009). The thermometer of social relations: Mapping social proximity on temperature. Psychological Science, 20(10), 1214–1220.

Koppell, J. G. S., & Steen, J. A. (2004). The effects of ballot position on election outcomes. Journal of Politics, 66(1), 267–281.

Miller, J. M., & Krosnick, J. A. (1998). The impact of candidate name order on election outcomes. Public Opinion Quarterly, 62(3), 291–330.

Mills, J. (2007). Evidence forming attitudes from combining beliefs about positive attributes of activities follows averaging (Unpublished manuscript). University of Maryland, College Park.

Rozin, P., & Royzman, E. B. (2001). Negativity bias, negativity dominance, and contagion. Personality and Social Psychology Review, 5(4), 296–320.

Webster, D. M., Richter, L., & Kruglanski, A. W. (1996). On leaping to conclusions when feeling tired: Mental fatigue effects on impressional primacy. Journal of Experimental Social Psychology, 32(2), 181–195.