Chad R. Mortensen

Signal Detection on the Battlefield: Priming Self-Protection vs. Revenge-Mindedness Differentially Modulates the Detection of Enemies and Allies

Detecting signs that someone is a member of a hostile outgroup can depend on very subtle cues. How do ecology-relevant motivational states affect such detections? This research investigated the detection of briefly-presented enemy (versus friend) insignias after participants were primed to be self-protective or revenge-minded. Despite being told to ignore the objectively nondiagnostic cues of ethnicity (Arab vs. Western/European), gender, and facial expressions of the targets, both priming manipulations enhanced biases to see Arab males as enemies. They also reduced the ability to detect ingroup enemies, even when these faces displayed angry expressions. These motivations had very different effects on accuracy, however, with self-protection enhancing overall accuracy and revenge-mindedness reducing it. These methods demonstrate the importance of considering how signal detection tasks that occur in motivationally-charged environments depart from results obtained in conventionally motivationally-inert laboratory settings.

Self-Control Moderates the Effectiveness of Influence Attempts Highlighting Injunctive Social Norms

Across three experiments involving different target behaviors, the trait of impulsivity reduced the effectiveness of persuasive messages framed using injunctive norms. In two of the three experiments, the trait of impulse restraint heightened the effectiveness of these same injunctive norm messages. No evidence was obtained for these traits as moderators when descriptive norms were used to frame messages or when no-norm control conditions were used. Taken together, these results are consistent with past evidence that effortful self-control processes are involved in the process of following injunctive social norms. Results also provide converging support for a theoretical perspective, suggesting that injunctive norms are associated with a specialized set of response tendencies that encourage group-oriented behavior.

Out of sight but not out of mind: memory scanning is attuned to threatening faces.

Working memory (WM) theoretically affords the ability to privilege social threats and opportunities over other more mundane information, but few experiments have sought support for this contention. Using a functional logic, we predicted that threatening faces are likely to elicit encoding benefits in WM. Critically, however, threat depends on both the capacities and inclinations of the potential aggressor and the possible responses available to the perceiver. Two experiments demonstrate that participants more efficiently scan memory for angry facial expressions, but only when the faces also bear other cues that are heuristically associated with threat: masculinity in Study 1 and outgroup status in Study 2. Moreover, male participants showed robust speed and accuracy benefits, whereas female participants showed somewhat weaker effects, and only when threat was clearly expressed. Overall results indicate that working memory for faces depends on the accessibility of self-protective goals and on the functional relevance of other social attributes of the face.

Trending Norms: A Lever for Encouraging Behaviors Performed by the Minority

If many people currently engage in a behavior, others are likely to follow suit. The current article extends research on these descriptive norms to examine the unique effect of trending norms: norms in which the number of people engaging in a behavior is increasing—and even if this is only among a minority of people: trending minority norms. The current research shows people conform more to these trending minority norms than a minority norm alone, or a no norm control condition—even though the norms addressed behaviors that differed from the target behavior. This demonstrates a distinct effect of trends and a strategy for leveraging normative information to increase conformity to behaviors not yet performed by a majority. Findings support that this increased conformity emerges because people predict the increase in prevalence will continue. An internal meta-analysis examining all data we collected on this topic supports these conclusions.

Infectious disease and imperfections of self-image

Infectious disease is an ever-present threat in daily life. Recent literature indicates that people manage this threat with a suite of antipathogenic psychological and behavioral defense mechanisms, which motivate the avoidance of people and objects bearing cues to pathogen risk. Here, we demonstrate that self-image is also impacted by these mechanisms. In seven studies, pathogen cues led individuals chronically averse to germs to express greater concern about their own physical appearance. Correspondingly, these people exhibited behavioral intentions and decisions intended to conceal or improve their appearance, such as purchasing facial products, taking pharmaceuticals, and undergoing cosmetic surgery. This work opens a new area of investigation for infectious-disease psychology research and highlights the central role played by physical appearance in pathogen-related cognition.