Reward, punishment, and cooperation: A meta-analysis.

How effective are rewards (for cooperation) and punishment (for noncooperation) as tools to promote cooperation in social dilemmas or situations when immediate self-interest and longer term collective interest conflict? What variables can promote the impact of these incentives? Although such questions have been examined, social and behavioral scientists provide different answers. To date, there is no theoretical and/or quantitative review of rewards and punishments as incentives for cooperation in social dilemmas. Using a novel interdependence-theoretic framework, we propose that rewards and punishments should both promote cooperation, and we identify 2 variables—cost of incentives and source of incentives—that are predicted to magnify the effectiveness of these incentives in promoting cooperation. A meta-analysis involving 187 effect sizes revealed that rewards and punishments exhibited a statistically equivalent positive effect on cooperation (d = 0.51 and 0.70, respectively). The effectiveness of incentives was stronger when the incentives were costly to administer, compared to free. Centralization of incentives did not moderate the effect size. Punishments were also more effective during iterated dilemmas when participants continued to interact in the same group, compared to both (a) iterated dilemmas with reassignment to a new group after each trial and (b) one-shot dilemmas. We also examine several other potential moderators, such as iterations, partner matching, group size, country, and participant payment. We discuss broad conclusions, consider implications for theory, and suggest directions for future research on rewards and punishment in social dilemmas. (PsycINFO Database Record (c) 2011 APA, all rights reserved)     

"Social categorization and the truly false consensus effect": Correction to Krueger and Zeiger.

Reports an error in "Social categorization and the truly false consensus effect" by Joachim Krueger and Joanna S. Zeiger (Journal of Personality and Social Psychology, 1993[Oct], Vol 65[4], 670-680). In this article, the second and third column headings of Table 2 were inadvertently transposed. The corrected table is provided in the erratum. (The following abstract of the original article appeared in record 1994-33435-001.) The false consensus effect involves adequate inductive reasoning and egocentric biases. To detect truly false consensus effects (TFCEs), item endorsements were correlated with the differences between estimated and actual consensus within Ss. In Exp 1, Ss overgeneralized from themselves to gender in-groups and to the overall population, but not to gender out-groups. Exps 2 and 3 demonstrated intuitive understanding of consensus bias. Another person's choices were inferred from that person's population estimates or estimates about the gender in-group. In Exp 4, Ss inferred that consensus estimates for a behavior were higher among people who were willing to engage in that behavior than among those who were not. Implications of these findings for general induction, social categorization, and the psychological processes underlying TFCEs are discussed. [A correction concerning this article appears in Journal of Personality and Social Psychology, 1993, Vol 65(6), 1090. The second and third column headings of Table 2 were inadvertently transposed and the corrected table is included.] (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Sex differences in cooperation: A meta-analytic review of social dilemmas.

Although it is commonly believed that women are kinder and more cooperative than men, there is conflicting evidence for this assertion. Current theories of sex differences in social behavior suggest that it may be useful to examine in what situations men and women are likely to differ in cooperation. Here, we derive predictions from both sociocultural and evolutionary perspectives on context-specific sex differences in cooperation, and we conduct a unique meta-analytic study of 272 effect sizes—sampled across 50 years of research—on social dilemmas to examine several potential moderators. The overall average effect size is not statistically different from zero (d = –0.05), suggesting that men and women do not differ in their overall amounts of cooperation. However, the association between sex and cooperation is moderated by several key features of the social context: Male–male interactions are more cooperative than female–female interactions (d = 0.16), yet women cooperate more than men in mixed-sex interactions (d = –0.22). In repeated interactions, men are more cooperative than women. Women were more cooperative than men in larger groups and in more recent studies, but these differences disappeared after statistically controlling for several study characteristics. We discuss these results in the context of both sociocultural and evolutionary theories of sex differences, stress the need for an integrated biosocial approach, and outline directions for future research. (PsycINFO Database Record (c) 2011 APA, all rights reserved)     

Suckers or saviors? Consistent contributors in social dilemmas.

[Correction Notice: An erratum for this article was reported in Vol 96(1) of Journal of Personality and Social Psychology (see record 2008-18683-006). An incorrect DOI was printed. The correct DOI is provided in the erratum.] Groups and organizations face a fundamental problem: They need cooperation but their members have incentives to free ride. Empirical research on this problem has often been discouraging, and economic models suggest that solutions are unlikely or unstable. In contrast, the authors present a model and 4 studies that show that an unwaveringly consistent contributor can effectively catalyze cooperation in social dilemmas. The studies indicate that consistent contributors occur naturally, and their presence in a group causes others to contribute more and cooperate more often, with no apparent cost to the consistent contributor and often gain. These positive effects seem to result from a consistent contributor's impact on group members' cooperative inferences about group norms. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Learning (not) to talk about race: When older children underperform in social categorization.

The present research identifies an anomaly in sociocognitive development, whereby younger children (8 and 9 years) outperform their older counterparts (10 and 11 years) in a basic categorization task in which the acknowledgment of racial difference facilitates performance. Though older children exhibit superior performance on a race-neutral version of the task, their tendency to avoid acknowledging race hinders objective success when race is a relevant category. That these findings emerge in late childhood, in a pattern counter to the normal developmental trajectory of increased cognitive expertise in categorization, suggests that this anomaly indicates the onset of a critical transition in human social development. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Intentions in teasing: When "just kidding" just isn't good enough.

Teasing is ambiguous. Although the literal content of a tease is, by definition, negative, seldom do teasers intend for their tease to be taken literally. Toward this aim, teasers often attempt to mitigate the negative surface content of the tease by communicating via gesture, facial expression, or tone of voice that they are "just kidding." The research presented here suggests that such attempts often fall on deaf ears. Despite teasers' attempts to mitigate the tease, targets are often unaware of--and unmoved by--the teaser's benign intentions. As a result, teasers and targets systematically differ in their perceptions of teasing: Although it is often seen as innocent and playful by the teaser, it tends to be construed as considerably more malicious by the target. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Emotion concepts and emotional states in social judgment and categorization.

An objection to conclusions of research investigating effects of emotions on cognitive processes is that the effects are due to the activation of semantic concepts rather than to emotional feelings. A sentence unscrambling task was developed to prime concepts of happiness, sadness, or neutral ideas. Pilot studies demonstrated that unscrambling emotional sentences did not affect emotional state but did prime semantically related words. Experiment 1 showed that the induction of emotional state but not the sentence unscrambling task produced emotion-congruent judgments. Results of Experiment 2 showed that individuals in emotional states categorized according to emotional equivalence more often than participants in a neutral state. Sentence unscrambling had no effect on emotional response categorization. The influences of emotions and emotion knowledge in cognition and emotion are discussed. (PsycINFO Database Record (c) 2011 APA, all rights reserved)     

Retrospection in social dilemmas: How thinking about the past affects future cooperation.

This article reports 2 studies investigating the effects of retrospective thought on future cooperation in social dilemmas. Some general theories of cooperation presume, but have not tested, whether retrospection has impact: People may think about the choices they could have made instead, realize that cooperation would have produced larger outcomes, and change their strategy as a result. Across both studies, the authors show that rate of future cooperation is directly related to the number of best-case scenarios and inversely related to the number of worst-case scenarios generated. The 2nd study also shows that the number and type of retrospective thoughts generated can be predicted from the person's social value orientation. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Comparing the neural basis of decision making in social dilemmas of people with different social value orientations, a fMRI study.

Using functional MRI, we investigate the neural correlates of intrinsic versus extrinsic motivation to cooperate by comparing people who differ in the personality trait Social Value Orientation. Participants (n = 28) played several one-shot prisoner's dilemma games (offering weak cooperative incentives) and coordination games (offering strong cooperative incentives) with anonymous partners while they were under the scanner. Behavioral results indicate that proself individuals adjust their behavior toward more cooperation when extrinsic incentives were present, while prosocials' decisions are not affected by game context. The neurological data is consistent with a priori developed hypotheses regarding different behavioral strategies, and suggest that extrinsically motivated proself strategies are driven by calculation and a situation-by-situation approach. Increased activation was found in dorsolateral prefrontal cortex, posterior superior temporal sulcus (STS), and precuneus. Intrinsically motivated prosocials' strategies reflect norm compliance, routine moral judgment, and social awareness. Increased activation was found in lateral orbitofrontal cortex, anterior STS, and inferior parietal lobule. (PsycINFO Database Record (c) 2011 APA, all rights reserved)     

Reciprocity and the induction of cooperation in social dilemmas.

Research in the 2-person Prisoner's Dilemma Game indicates that a tit-for-tat (TFT) strategy is most effective in inducing an S to cooperate. In extending this to the N-person case, it was hypothesized that the larger the proportion of group members who use a reciprocal strategy, the greater the likelihood that other members will cooperate. Ss (college students) were asked to make choices in a public goods paradigm. Three experiments were conducted, varying group size (3, 5, and 9 persons) and the strategies used by simulated players (reciprocal or random). Results provide support for the basic reciprocity hypothesis and are interpreted in terms of (1) the properties of reciprocal TFT strategies described by R. Axelrod (1984), (2) D. G. Pruitt and M. J. Kimmel's (1977) goal-expectation hypothesis, and (3) C. E. Osgood's (1962) graduated and reciprocated initiatives in tension reduction strategy for reducing international tension. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Mixed-motive conflict in social dilemmas: Mood as input to competitive and cooperative goals.

Four studies using diverse manipulations demonstrated that moods interacted with competitive and cooperative goals to influence people's behaviors in social dilemmas. This was true whether moods were manipulated by films (Studies 1 and 2) or music (Study 4) or were assessed dispositionally (Study 3); whether specific or global goals were manipulated (Studies 1, 3, and 4) or were assessed dispositionally (Study 2); and whether participants' actions were tested in a resource dilemma (Studies 1, 2, and 4) or prisoner's dilemma game (Study 3). In 3 studies, bad moods led to more competition (less cooperation) with competitive goals in mind but to more cooperation (less competition) with cooperative goals in mind. A 4th study reversed this pattern with goals framed in terms of enjoyment. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Cooperation in social dilemmas: Free riding may be thwarted by second-order reward rather than by punishment.

Cooperation among nonrelatives can be puzzling because cooperation often involves incurring costs to confer benefits on unrelated others. Punishment of noncooperators can sustain otherwise fragile cooperation, but the provision of punishment suffers from a "second-order" free-riding problem because nonpunishers can free ride on the benefits from costly punishment provided by others. One suggested solution to this problem is second-order punishment of nonpunishers; more generally, the threat or promise of higher order sanctions might maintain the lower order sanctions that enforce cooperation in collective action problems. Here the authors report on 3 experiments testing people's willingness to provide second-order sanctions by having participants play a cooperative game with opportunities to punish and reward each other. The authors found that people supported those who rewarded cooperators either by rewarding them or by punishing nonrewarders, but people did not support those who punished noncooperators--they did not reward punishers or punish nonpunishers. Furthermore, people did not approve of punishers more than they did nonpunishers, even when nonpunishers were clearly unwilling to use sanctions to support cooperation. The results suggest that people will much more readily support positive sanctions than they will support negative sanctions. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Evidence for hypodescent and racial hierarchy in the categorization and perception of biracial individuals.

Individuals who qualify equally for membership in two racial groups provide a rare window into social categorization and perception. In 5 experiments, we tested the extent to which a rule of hypodescent, whereby biracial individuals are assigned the status of their socially subordinate parent group, would govern perceptions of Asian–White and Black–White targets. In Experiment 1, in spite of posing explicit questions concerning Asian–White and Black–White targets, hypodescent was observed in both cases and more strongly in Black–White social categorization. Experiments 2A and 2B used a speeded response task and again revealed evidence of hypodescent in both cases, as well as a stronger effect in the Black–White target condition. In Experiments 3A and 3B, social perception was studied with a face-morphing task. Participants required a face to be lower in proportion minority to be perceived as minority than in proportion White to be perceived as White. Again, the threshold for being perceived as White was higher for Black–White than for Asian–White targets. An independent categorization task in Experiment 3B further confirmed the rule of hypodescent and variation in it that reflected the current racial hierarchy in the United States. These results documenting biases in the social categorization and perception of biracials have implications for resistance to change in the American racial hierarchy. (PsycINFO Database Record (c) 2011 APA, all rights reserved)     

Social categorization as a function of latitude of acceptance and series range.

The categories used when Ss select their number and labels were studied in a 2 X 2 X 2 design as a function of latitudes of acceptance prevailing in 2 populations (American Indian and non-Indian), the range of the stimulus series, and the social value of the objects. Category widths and scale centers used by Ss from the 2 populations for neutral series (numerals) did not differ significantly, but those for valued series (monetary values) did. When the valued series range exceeded the latitude of acceptance (independently estimated), the assimilation of higher values which occurred was limited by initial population differences in latitude of acceptance. More discrepant values were accumulated into a broad objectionable category (contrast). (25 ref.) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Feature and rule selection in categorization tasks.

The process by which stimuli are assigned to categories has been traditionally conceptualized as bottom-up. Accordingly, stimulus features are supposed to be the fundamental units of analysis, and categorization to be accomplished on the basis of feature category correlations (cue validities). Alternatively, top-down processes are invoked, in which case one begins with a given categorization rule and then assigns stimuli to categories on that basis. Bottom-up and top-down views share a fundamental weakness, namely, they are unable to specify how features or rules, respectively, are acquired. This difficulty can be overcome if it is assumed that the process starts with neither features nor rules, but with stimuli. Then, as a result of experience with stimuli belonging to different categories, the cognitive system discovers and uses locally constructed features that maximally discriminate between the categories at hand. According to this view, the relationship between a target and a contrast category is the main factor affecting what subjects learn about each. Two experiments were conducted to explore this hypothesis. Both experiments support the notion that the relationship between the target and contrast category significantly determines which critical features are extracted as being defining of either category. In particular, it determines the level of generality of these features. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Stereotypes as dominant responses: On the "social facilitation" of prejudice in anticipated public contexts.

This article challenges the highly intuitive assumption that prejudice should be less likely in public compared with private settings. It proposes that stereotypes may be conceptualized as a type of dominant response (C. L. Hull, 1943; R. B. Zajonc, 1965) whose expression may be enhanced in public settings, especially among individuals high in social anxiety. Support was found for this framework in an impression formation paradigm (Experiment 1) and in a speeded task designed to measure stereotypic errors in perceptual identification (Experiment 2). Use of the process dissociation procedure (B. K. Payne, L. L. Jacoby, & A. J. Lambert, in press) demonstrated that these effects were due to decreases in cognitive control rather than increases in stereotype accessibility. The findings highlight a heretofore unknown and ironic consequence of anticipated public settings: Warning people that others may be privy to their responses may actually increase prejudice among the very people who are most worried about doing the wrong thing in public. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Does social exclusion motivate interpersonal reconnection? Resolving the "porcupine problem."

Evidence from 6 experiments supports the social reconnection hypothesis, which posits that the experience of social exclusion increases the motivation to forge social bonds with new sources of potential affiliation. Threat of social exclusion led participants to express greater interest in making new friends, to increase their desire to work with others, to form more positive impressions of novel social targets, and to assign greater rewards to new interaction partners. Findings also suggest potential boundary conditions to the social reconnection hypothesis. Excluded individuals did not seem to seek reconnection with the specific perpetrators of exclusion or with novel partners with whom no face-to-face interaction was anticipated. Furthermore, fear of negative evaluation moderated responses to exclusion such that participants low in fear of negative evaluation responded to new interaction partners in an affiliative fashion, whereas participants high in fear of negative evaluation did not. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Effects of endowment amount and attributions on responses to a subgroup social dilemma.

A subgroup social dilemma exists when the personal interests of 2 or more individuals conflict with the interest of a larger group to which they belong such that a defecting response is economically more rational for each individual than a cooperative response and the individuals involved identify with different (sub)groups. The impact of endowment amount and attributions for the amounts allocated on responses to a subgroup social dilemma was examined. Justified inequality and luck-based equality generated low levels of cooperation, whereas justified equality and luck-based inequality generated high levels of cooperation. Five potential psychological mediators were examined: attraction to the subgroup, perceived interdependency, superordinate identification, self-focused thoughts, and normative expectations. Theoretical and empirical implications are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The "I," the "we," and the "when": A meta-analysis of motivational primacy in self-definition.

What is the primary motivational basis of self-definition? The authors meta-analytically assessed 3 hypotheses: (a) The individual self is motivationally primary, (b) the collective self is motivationally primary, and (c) neither self is inherently primary; instead, motivational primacy depends on which self becomes accessible through contextual features. Results identified the individual self as the primary motivational basis of self definition. People react more strongly to threat and enhancement of the individual than the collective self. Additionally, people more readily deny threatening information and more readily accept enhancing information when it pertains to the individual rather than the collective self, regardless of contextual influences. The individual self is the psychological home base, a stable system that can react flexibly to contextual influences. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Cognitive adaptation to the experience of social and cultural diversity.

Diversity is a defining characteristic of modern society, yet there remains considerable debate over the benefits that it brings. The authors argue that positive psychological and behavioral outcomes will be observed only when social and cultural diversity is experienced in a way that challenges stereotypical expectations and that when this precondition is met, the experience has cognitive consequences that resonate across multiple domains. A model, rooted in social categorization theory and research, outlines the preconditions and processes through which people cognitively adapt to the experience of social and cultural diversity and the resulting cross-domain benefits that this brings. Evidence is drawn from a range of literatures to support this model, including work on biculturalism, minority influence, cognitive development, stereotype threat, work group productivity, creativity, and political ideology. The authors bring together a range of differing diversity experiences and explicitly draw parallels between programs of research that have focused on both perceiving others who are multicultural and being multicultural oneself. The findings from this integrative review suggest that experiencing diversity that challenges expectations may not only encourage greater tolerance but also have benefits beyond intergroup relations to varied aspects of psychological functioning. (PsycINFO Database Record (c) 2011 APA, all rights reserved)