Very First Impressions
Total Page:16
File Type:pdf, Size:1020Kb
Emotion Copyright 2006 by the American Psychological Association 2006, Vol. 6, No. 2, 269–278 1528-3542/06/$12.00 DOI: 10.1037/1528-3542.6.2.269 Very First Impressions Moshe Bar, Maital Neta, and Heather Linz Martinos Center at Massachusetts General Hospital, Harvard Medical School First impressions of people’s personalities are often formed by using the visual appearance of their faces. Defining how quickly these impressions can be formed has critical implications for understanding social interactions and for determining the visual properties used to shape them. To study impression formation independent of emotional cues, threat judgments were made on faces with a neutral expression. Consequently, participants’ judgments pertained to the personality rather than to a certain temporary emotional state (e.g., anger). The results demonstrate that consistent first impressions can be formed very quickly, based on whatever information is available within the first 39 ms. First impressions were less consistent under these conditions when the judgments were about intelligence, suggesting that survival- related traits are judged more quickly. The authors propose that low spatial frequencies mediate this swift formation of threat judgments and provide evidence that supports this hypothesis. Keywords: first impressions, threat, face perception, rapid personality judgment, intelligence Our first impressions of others can be truthful. For example, Until now there has not been a clear definition of such temporal humans are excellent in judging personality traits and complex lower limit on impression formation, but relevant studies have social characteristics such as dominance, hierarchy, warmth, and been conducted with relation to the detection of facial valence. threat (Ambady, Bernieri, & Richeson, 2000; Berry, 1990; Broth- When faces are emotionally expressive, people can detect the ers, 1997; Funder, 1987; Hassin & Trope, 2000; Zebrowitz, 1997). expressions they convey, particularly threatening and fearful ex- Accurate first impressions of personality traits have been shown to pressions, rapidly and perhaps even nonconsciously (Blair, Morris, be possible when observers were exposed to relatively short inter- Frith, Perrett, & Dolan, 1999; Glascher & Adolphs, 2003; Kirouac vals (4–10 min) of ongoing streams of individuals’ behavior, & Dore, 1984; Pessoa, Japee, & Ungerleider, 2005; van Honk et termed thin slices (Ambady et al., 2000; Ambady & Rosenthal, al., 1998; Whalen, 1998; Williams et al., 2004). In the present 1992; Funder, 1987). In fact, observers seem to be able to extract study, however, threat judgments were made on neutral faces— the cues required for impressions even from static photographs faces with no obvious negative or positive expression—that were presented for 10 s (Berry, 1990). In these studies, impressions rigorously rated for neutral expression previously. There is a formed with “zero acquaintance” were typically compared with profound difference between a threatening impression elicited by a robust data to infer the accuracy of first impressions, generally threatening face expression, such as anger, and a threatening resulting in significant correlations. As such, rapidly formed first impression of a face with a neutral expression. A face expression impressions can facilitate our survival and interaction with the represents a certain emotional state, and a threatening expression environment. (Of course, first impressions can sometimes be in- in particular indicates a possible immediate danger, regardless of accurate and, consequently, misguide our behavior in a less desir- that person’s personality otherwise. On the other hand, a person able manner.) The goal of the study reported here was to test how who seems threatening even with a neutral face expression gives quickly people can form impressions that are consistent across the impression of being generally threatening but does not neces- observers, independent of their validity. Revealing the speed of sarily imply an immediate threat to the observer. Specifically, impression formation would enhance our understanding of social given that a person with a neutral expression is not perceived as interaction and, by identifying this limit on processing time, will immediately threatening may imply that the features required for allow gaining novel insights about the type and complexity of the inferring threat in this case are expressed to a lesser extent and thus visual features used to create first impressions. will be detected at a higher perceptual threshold, compared with judgment of threatening expressions, where it is beneficial for these features to be extracted as quickly as possible. We report here four experiments: The first measures the speed Moshe Bar, Maital Neta, and Heather Linz, Martinos Center at Massa- in which first impressions about a threatening personality and chusetts General Hospital (MGH), Harvard Medical School. intelligence can be formed, the second examines the role of aware- This study was supported by the James S. McDonnell Foundation 21st ness in these judgments, and the third and fourth test our proposal Century Science Research Award #21002039 (to Moshe Bar) and by the that low spatial frequencies mediate the formation of such rapid MIND Institute. first impressions. We thank D. Carney, M. Fenske, K. Kveraga, J. Mitchell, and M. Vangel for their helpful comments. Experiment 1: Speed of Impression Formation Correspondence concerning this article should be addressed to Moshe Bar, Martinos Center at MGH, Harvard Medical School, 149 Thirteenth Participants in the present experiment were shown one face at a St., Charlestown, MA 02129. E-mail: [email protected] time and were asked to rate, on a scale ranging from 1 to 5, the 269 270 BAR, NETA, AND LINZ level at which they perceived each face to belong to a threatening these faces because of visible moles. The additional 64 faces were taken person (or an intelligent person in the second part of this experi- from various sources, including the AR Face Database (Martinez & ment). Given that responses in such an experiment are inherently Benavente, 1998), the University of Stirling (http://pics.psych.stir.ac.uk/), subjective, the “correctness” of first impressions reported in the the Database of Faces (http://www.uk.research.att.com/facedatabase.html), conditions in which these faces were presented briefly was inferred and Yale University (http://cvc.yale.edu/projects/yalefaces/yalefaces. html). These faces can also be considered generally neutral in their ex- from their consistency with judgments made when the same faces pression, but the rating of neutrality for these images is less well docu- were presented for a considerably longer exposure to a different mented, compared with that of the subset of images mentioned earlier, group of participants. In other words, if we consider impressions which is used as the primary set of stimuli for the present purposes. The that are formed when pictures are presented long enough to be images were cropped to contain facial features only. Each face was easily recognizable as the baseline impressions, independent of followed by one of 15 alternating masks, which were designed to be how veridical these judgments are, then we can measure how effective for grayscale pictures of faces. Our masks consisted of black quickly the same faces can be presented and still be judged lines, approximately 2 mm in diameter on an abstract background of gray similarly to this baseline. Therefore, by presenting the faces for and white. These masks were randomly presented with a target face, so that different durations to different groups of participants and subse- each time a face was presented, a different mask immediately followed it. quently measuring the correlation between the judgments of each The image presentation and response collection were controlled by a ϫ group and the group that judged the same faces during long Macintosh Power Mac G4, with a monitor resolution of 1024 768 pixels presentations, we can identify how quickly observers judge a face and a refresh rate of 75 Hz, using a MATLAB-based program. Procedure. We started by testing threat judgments. Participants had to as having a certain personality. rate, on a scale of 1 to 5, the level at which they perceived each face to belong to a threatening person. The responses were counterbalanced so that Method the ratings ranged from least threatening (1) to most threatening (5) for one half of the participants and from most threatening (1) to least threatening Participants. Sixty adults (42 women; age range ϭ 18–45) partici- (5) for the other half. Participants were explicitly instructed to follow their pated for either course credit or for a monetary compensation, 10 in each immediate gut reaction in judging the faces. Individual faces were pre- of the conditions (3 [exposure duration] ϫ 2 [personality judgment]). All sented on the computer screen for 26 ms (10 participants), 39 ms (10 had normal or corrected-to-normal vision. None were aware of the purpose participants), or 1700 ms (10 participants; see Figure 1). Each participant of the experiment. Informed written consent was obtained from each saw each face once. We then conducted an identical experiment, except participant before the experiment. All procedures were approved by Mas- that the participants’ task was to rate, on the same counterbalanced 1–5 sachusetts General Hospital Human Studies Protocol No. 2002-P-001754 scale, the level at which