Leslie A. Zebrowitz

Does sexual dimorphism in human faces signal health

Evolutionary psychologists suggest that a preference for sexually dimorphic traits in human faces is an adaptation for mate choice, because such traits reflect health during development. For male faces, this claim rests on the immunocompetence-handicap hypothesis, which states that the increased testosterone levels needed to develop large masculine traits stress the immune system. We examined whether masculine traits in adolescent male faces are associated with health during development, and also whether feminine traits in adolescent female faces signal health. Feminine traits are attractive, but it is less clear whether they should signal health. Rated masculinity in adolescent male faces correlated modestly with actual health, and was perceived as healthy, but not as attractive. Rated femininity in adolescent female faces did not correlate with actual health, although it was perceived as healthy and attractive. These results support the immunocompetence-handicap hypothesis for male faces in that masculine traits signalled health during adolescence. However, they suggest that any health-related evolutionary benefits obtained from preferences for attractive facial traits may be weak.

Do facial averageness and symmetry signal health

We investigated whether the attractive facial traits of averageness and symmetry signal health, examining two aspects of signalling: whether these traits are perceived as healthy, and whether they provide accurate health information. In Study 1, we used morphing techniques to alter the averageness and symmetry of individual faces. Increases in both traits increased perceived health, and perceived health correlated negatively with rated distinctiveness (a converse measure of averageness) and positively with rated symmetry of the images. In Study 2, we examined whether these traits signal real, as well as perceived, health, in a sample of individuals for whom health scores, based on detailed medical records, were available. Perceived health correlated negatively with distinctiveness and asymmetry, replicating Study 1. Facial distinctiveness ratings of 17-year-olds were associated with poor childhood health in males, and poor current and adolescent health in females, although the last association was only marginally significant. Facial asymmetry of 17-year-olds was not associated with actual health. We discuss the implications of these results for a good genes account of facial preferences.

Accurate Social Perception at Zero Acquaintance: The Affordances of a Gibsonian Approach

We review research on accurate social perception at zero acquaintance and apply a Gibsonian ecological approach to redress several shortcomings. We argue that recent use of Brunswiks lens model to determine what physical qualities accurately communicate psychological traits has limited utility because it fails to consider the structured information provided by configural physical qualities that is central to Gibsons (1979) theory. We elaborate a developmental model of relationships between physical and psychological qualities that highlights research needed to identify configural physical qualities that may inform accurate perceptions. This model and tenets of the ecological theory yield several hypotheses regarding such qualities. Finally, we advocate the value of studying perceived affordances (opportunities for acting, interacting, or being acted upon) because this will focus attention on the neglected issue of contextual influences on social perception accuracy, and because affordances may be perceived more accurately than global personality traits.

Does Human Facial Attractiveness Honestly Advertise Health? Longitudinal Data on an Evolutionary Question

Inspired by the evolutionary conjecture that sexually selected traits function as indicators of pathogen resistance in animals and humans, we examined the notion that human facial attractiveness provides evidence of health. Using photos of 164 males and 169 females in late adolescence and health data on these individuals in adolescence, middle adulthood, and later adulthood, we found that adolescent facial attractiveness was unrelated to adolescent health for either males or females, and was not predictive of health at the later times. We also asked raters to guess the health of each stimulus person from his or her photo. Relatively attractive stimulus persons were mistakenly rated as healthier than their peers. The correlation between perceived health and medically assessed health increased when attractiveness was statistically controlled, which implies that attractiveness suppressed the accurate recognition of health. These findings may have important implications for evolutionary models.

Looking Smart and Looking Good: Facial Cues to Intelligence and their Origins

The authors investigated accuracy of judging intelligence from facial photos of strangers across the lifespan, facial qualities contributing to accuracy, and developmental paths producing correlations between facial qualities and IQ scores. Judgments were more accurate than chance in childhood and puberty, marginally more accurate in middle adulthood, but not more accurate than chance in adolescence or late adulthood. Reliance on the valid cue of facial attractiveness could explain judges’ accuracy. Multiple developmental paths contributed to relationships between facial attractiveness and IQ: biological, environmental, influences of intelligence on attractiveness, influences of attractiveness on intelligence. The findings provide a caveat to evolutionary psychologists’ assumption that relationships between attractiveness and intelligence or other traits reflect an influence of “good genes” on both, as well as to social and developmental psychologists’ assumption that such relationships reflect self-fulfilling prophecy effects. Each of these mechanisms failed to explain some observed correlations.

Person perception comes of age: The salience and significance of age in social judgments.

Publisher Summary This chapter examines peoples perceptions of individuals of different ages and the social and psychological consequences of these age-related judgments. The chapter considers age as a salient and significant component of social judgments. It essentially describes the nature of the physical information that differentiates people on the basis of age and exhibit that social perceivers are very sensitive to this information, using it not only to identify a persons age but also to categorize people and to guide interpersonal behavior. Moreover, the chapter reviews the age-overgeneralization effects that can contribute in significant ways both to first impressions of people and to certain group stereotypes. It also examines the influence of age-based social judgments on peoples social outcomes as well as their psychological development. The role of age in peoples self-identities is explored in the chapter. The chapter concludes with the discussion of consequences of age, by considering the relative impact of age-related indications on social judgments in comparison to other factors.

Stability of babyfaceness and attractiveness across the life span.

Differential, structural, and absolute stability of babyfaceness and attractiveness at 5 ages were investigated. Attractiveness had differential stability across the life span. Babyfaceness had differential stability from childhood through the 30s for males and through adolescence for females. Consistent with sexual dimorphisms in facial maturation, males had less differential stability in babyfaceness from childhood to puberty than females. Structural stability of facial appearance, as reflected in the relationship between babyfaceness and attractiveness across the life span, was low, with these qualities positively related for females in childhood and for both sexes in their 30s and 50s but unrelated in puberty and adolescence. Absolute stability of babyfaceness and attractiveness was also low, with mean levels decreasing across the life span. Contrary to cultural stereotypes, age-related decreases in attractiveness were equal for male and female Ss.

They don't all look alike : individuated impressions of other racial groups

Reliability, content, and homogeneity of own- and other-race impressions were assessed: U.S. White, U.S. Black, and Korean students rated faces of White, Black, or Korean men. High intraracial reliabilities revealed that people of 1 race showed equally high agreement regarding the traits of own- and other-race faces. Racially universal appearance stereotypes--the attractiveness halo effect and the babyface overgeneralization effect--contributed substantially to interracial agreement, which was only marginally lower than intraracial agreement. Moreover, similar attention to variations in appearance yielded similar degrees of own- and other-race trait differentiation. When own- and other-race differences in the differentiation of faces on babyfaceness were statistically controlled, differences in trait differentiation were eliminated. Despite the individuated impressions of other-race faces, certain racial stereotypes persisted.

Impressions of Babyfaced Individuals Across the Life Span

Four questions were addressed concerning perceptions of babyfaced individuals from infancy to older adulthood: (a) Do perceivers make reliable babyface judgments at each age; (b) does a babyface have the same effects on trait impressions at each age; (c) are the effects of a babyface independent of the effects of attractiveness; and (d) what facial maturity features are associated with babyface ratings, and do these features predict trait impressions? Ratings of portrait photographs revealed that perceivers reliably detect variations in babyfaceness across the life span. Facial measurements revealed that large eyes, a round face, thin eyebrows, and a small nose bridge characterized a babyface. Trait impressions showed a babyface overgeneralization effect at each age: Babyfaced individuals were perceived to have more childlike traits than their maturefaced peers, and this effect was independent of attractiveness. Considerable evidence indicates that appearance has a significant impact on social perceptions and social interactions, which may have important implications for personality development. Not only is appearance one of the initial qualities that children and adults mention in their descriptions of people (Fiske & Cox, 1979; Livesley & Bromley, 1973), but it also influences the traits they ascribe to others (see Alley, 1988; Bull &

Bright, bad, babyfaced boys: appearance stereotypes do not always yield self-fulfilling prophecy effects.

Three studies tested the hypothesis that babyfaced adolescent boys would compensate for the undesirable expectation that they will exhibit childlike traits by behaving contrary to it. Studies 1 and 2 revealed that babyfaced boys from middle- and lower class samples, including a sample of delinquents, showed higher academic achievement than their mature-faced peers, refuting the stereotype of babyfaced people as intellectually weak. In the lower class samples, this compensation effect was moderated by IQ and socioeconomic status (SES), variables that influence the ability to overcome low expectations. Study 3 showed that babyfaceness also can produce negative compensatory behaviors. Low-SES babyfaced boys were more likely than their mature-faced peers to be delinquent, and babyfaced delinquents committed more crimes, refuting the stereotype of babyfaced people as warm, submissive, and physically weak.