P-Curve Analysis of the Köhler Motivation Gain Effect in Exercise Settings: A Demonstration of a Novel Technique to Estimate Evidential Value Across Multiple Studies

Background Practitioners and researchers may not always be able to adequately evaluate the evidential value of findings from a series of independent studies. This is partially due to the possibility of inflated effect size estimates for these findings as a result of researcher manipulation or selective reporting of analyses (i.e., p-hacking). In light of the possible overestimation of effect sizes in the literature, the p-curve analysis has been proposed as a worthwhile tool that may help identify bias across a series of studies focused on a single effect. The p-curve analysis provides a measure of the evidential value in the published literature and might highlight p-hacking practices. Purpose Therefore, the purpose of this paper is to introduce the mechanics of the p-curve analysis to individuals researching phenomena in the psychosocial aspects of behavior and provide a substantive example of a p-curve analysis using findings from a series of studies examining a group dynamic motivation gain paradigm. Methods We performed a p-curve analysis on a sample of 13 studies that examined the Köhler motivation gain effect in exercise settings as a means to instruct readers how to conduct such an analysis on their own. Results The p-curve for studies examining the Köhler effect demonstrated evidential value and that this motivation effect is likely not a byproduct of p-hacking. The p-curve analysis is explained, as well as potential limitations of the analysis, interpretation of the results, and other uses where a p-curve analysis could be implemented.

Attenuation of the Köhler Effect in Racially Dissimilar Partnered Exercise Reversed Using Team Identity Strategy

The authors describe two research experiments exploring the influence of race on the Köhler motivation gain effect with exercise tasks. Experiment 1 tested whether partner racial dissimilarity affects individual performance. Experiment 2 created a team identity recategorization intervention to potentially counter the influence on performance observed in Experiment 1. White male participants were partnered with either a Black or Asian partner (Experiment 1) or with a Black partner utilizing team names and shirt colors as a team identity recategorization strategy (Experiment 2). Racially dissimilar dyads completed two sets of abdominal plank exercises with a Köhler conjunctive task paradigm (stronger partner; team performance outcome dependent upon the weaker-ability participant’s performance). The results of Experiment 1 suggest attenuation of the previously successful group motivation gain effect in the racially dissimilar condition. The simple recategorization strategy utilized in Experiment 2 appeared to reverse motivation losses under conjunctive-task conditions in racially dissimilar exercise dyads.

Motivation gains on divisible conjunctive group tasks

Two studies examined the effort that participants expended on a challenging physical persistence activity when that activity was a critical part of a divisible conjunctive task performed by two people working as a team compared to when it was structured as an individual task performed by one person working alone. It was found that participants put greater effort into that activity when they worked as part of a team task compared to when they worked alone—a motivation gain when working in groups. This gain occurred despite the absence of any apparent task-related ability differences among participants, and is most parsimoniously explained by the greater indispensability associated with working on a critical element of a divisible conjunctive group task. The implications of these results for the occurrence of motivation gains on other types of tasks and in real-world work settings are discussed.

Buddy Up for Exergames

Many adults and children in the U.S. are not active enough to meet the U.S. Department of Health and Human Services guidelines for physical activity to maintain health and reduce the risk of chronic disease. Exergames (exercise video games) have the potential to promote physical activity, and researchers have examined ways for improving motivation to exercise for longer and at higher intensities with these types of games. This chapter considers group dynamics principles as one way to influence motivation within exergames to help realize better health outcomes. We illustrate how group dynamics principles can be applied to exergames and how different task structures within groups (e.g., conjunctive, additive, and coactive tasks) can influence motivation. One group dynamic principle, the Köhler motivation gain effect, has been the basis of a series of research studies that we have conducted within exergames. We summarize this research, discuss the issues, controversies, and problems with using group dynamics in exergames, and provide possible solutions and recommendations.

A cross-cultural study on the Köhler Motivation Gain Effect in team performance

The present study examined a factor that could contribute to cross-cultural differences in team performance (viz., age composition between team members) within one group motivation-gain paradigm (viz. the Köhler motivation gain, where a low-ability team member works harder in a team where they are the “weak link” than if s/he were working alone; Hertel, Kerr, & Messé, 2000a). In Exp. 1, I proposed that cultural difference between East Asians and Westerners(e.g., collectivism vs. individualism, interdependent vs. independent self-construal) could moderate the Köhler motivation gain effect, but the results showed that the culture did not moderate the Köhler effect. In Exp. 2, I found that age composition between group members (i.e., working with younger partner vs. older partner) might have different meaning in Korean culture compared to American culture. Finally, in Exp. 3., I conducted an experiment which extended the results of the Exp. 2 in two ways: 1) the Exp. 3 collected actual performance data rather than respondents’ intention to perform, as in the prior study, and 2) the Exp. 3 competitively tested alternative explanations for an age-of-partner effect in Korea. Both the performance results and subjective ratings of the present study suggested that the age effect in Korea could be explained in terms of participant’s felt responsibility in the task performance situation (i.e., Koreans felt more responsibility for the outcome of their group when they worked with a younger partner than an older partner). These results were discussed in terms of the social psychological implications of the deeply rooted Confucianism in Korean society (Koh, 1996). Limitations of the study and implications of the results for understanding existing cross-cultural theories were also discussed.