Daniel Tumminelli O'Brien

Intrasexual peer aggression and dating behavior during adolescence: an evolutionary perspective.

It has been suggested that the use of intrasexual aggression is a form of competition associated with reproductive opportunities. Here the authors investigated the relationship between retrospective dating and flirting behavior and peer aggression and victimization during middle and high school. Results indicate that the use of peer aggression was associated with adaptive dating outcomes in both sexes, whereas experiencing peer victimization was correlated with maladaptive dating behaviors among females only. Females who perpetrated high levels of indirect (i.e. nonphysical) aggression reported that they began dating at earlier ages in comparison to their peers, whereas aggressive males reported having more total dating partners. Experiencing female-female peer victimization was correlated with a later onset of dating behavior, more total dating partners, and less male flirtation while growing up. This report strengthens the connection between adolescent peer aggression and reproductive competition, suggesting a potential functionality to adolescent peer aggression in enhancing ones own mating opportunities at the expense of rivals.

Handgrip strength and socially dominant behavior in male adolescents

Handgrip strength (HGS) is highly heritable and a good overall measure of strength and muscle function. Indicative of blood testosterone levels and fat-free body mass, HGS is also highly sexually dimorphic. Recent psychological research shows that HGS is correlated with a number of social variables, but only in males. We conducted three studies to further investigate the relationship between HGS and measures of aggression and social competition among adolescents. Consistent with previous reports, correlations were almost exclusive to males, but this was only visible during late adolescence (i.e., high school). These findings support evolutionary hypotheses regarding grip strength in male-male competition and suggest that similar to measures of testosterone, HGS is a measure that is predictive of social behavior in older adolescent males.

Community Perception: The Ability to Assess the Safety of Unfamiliar Neighborhoods and Respond Adaptively

When entering an unfamiliar neighborhood, adaptive social decisions are dependent on an accurate assessment of the local safety. Studies of cities have shown that the maintenance of physical structures is correlated with the strength of ties between neighbors, which in turn is responsible for the crime level. Thus it should be theoretically possible to intuit neighborhood safety through the physical structures alone. Here we test whether people have this capacity for judging urban neighborhoods with 3 studies in which individuals observed photographs of unfamiliar neighborhoods in Binghamton, New York. Each study was facilitated by data collected during previous studies performed by the Binghamton Neighborhood Project studies. In the 1st study, observer ratings on neighborhood social quality agreed highly with reports by those living there. In the 2nd, a separate sample of participants played an economic game with adolescent residents from pictured neighborhoods. Players exhibited a lower level of trust toward adolescents from neighborhoods whose residents report lesser social quality. In the 3rd study, the maintenance of physical structures and the presence of businesses explained nearly all variation between neighborhoods in observer ratings (89%), whereas the specific features influencing play in Study 2 remained inconclusive. These and other results suggest that people use the general upkeep of physical structures when making wholesale judgments of neighborhoods, reflecting a adaptation for group living that has strong implications for the role of upkeep in urban environments.

Broken Windows and Low Adolescent Prosociality: Not Cause and Consequence, but Co-symptoms of Low Collective Efficacy

The current study presents a case in which adolescent prosociality is lower in neighborhoods with greater physical disorder. Current theory provides two interpretations for such a pattern: (1) that disorder signals a threatening environment and discourages prosociality (“broken windows theory”); (2) that disorder and low prosociality are both symptoms of a weak community (i.e., low collective efficacy). A survey of 642 students from a small American city was combined with an assessment of the built environment to evaluate these two interpretations. Students were nested in 59 Census block groups. Multilevel models demonstrated that collective efficacy best explained variation in prosociality between neighborhoods, and that perceived collective efficacy best explained variation within neighborhoods. Objective and perceived disorder had no significant relationship with prosociality in these models, suggesting that disorder is not directly responsible for cross-neighborhood variation in prosociality. The paper discusses the implications for place-based interventions promoting prosociality. The results also emphasize the need for measures of social processes (e.g., collective efficacy) when evaluating “broken windows” hypotheses.

Residential Mobility and Prosocial Development Within a Single City

Neighborhood social dynamics have been shown to impact behavioral development in residents, including levels of prosociality (i.e. positive social behavior). This study explores whether residential moves to neighborhoods with different social dynamics can influence further prosocial development. Prosociality, five domains of social support, and residential location were tracked between 2006 and 2009 in 397 adolescents across a small city in upstate New York. Analysis compared the role of the different forms of social support in prosocial development for movers versus non-movers. The effects of one’s neighborhood of residence at Time 2 were also compared between movers and non-movers. Prosocial development in these two groups responded similarly to all forms of social support, including from neighbors. Movers experienced a greater increase in prosociality the more residentially stable the adolescent population of their new neighborhood of residence. Such neighborhood characteristics were not influential in the prosocial development of non-movers.

Self-Perceived Mating Intelligence Predicts Sexual Behavior in College Students: Empirical Validation of a Theoretical Construct

The cognitive abilities necessary to successfully navigate mating interactions have been termed “Mating Intelligence,” a theoretical construct that has only recently begun to receive empirical attention. In two studies using samples of undergraduates, we found that ones responses on a self-report Mating Intelligence measure predicts reproductive behavior in both sexes. In the first, higher scores on the survey were associated with more sexual partners in males and early sexual onset in females. The second study, which measured “hook-ups,” or uncommitted sexual encounters, again found higher scores to predict more partners in males. Females with high scores had more hook-ups with males who would be good candidates for long-term relationships. In each study, Mating Intelligence correlated with evolutionarily adaptive decisions for both sexes. While an internal validation found that improvement can be made on this metric, these studies comprise an early step in the empirical study of Mating Intelligence.