@article{RodriguesUlrichMusseletal.2017,
  author    = {Rodrigues, Johannes and Ulrich, Natalie and Mussel, Patrick and Carlo, Gustavo and Hewig, Johannes},
  title     = {Measuring prosocial tendencies in Germany: sources of validity and reliablity of the revised prosocial tendency measure},
  series = {Frontiers in Psychology},
  volume    = {8},
  journal   = {Frontiers in Psychology},
  doi       = {10.3389/fpsyg.2017.02119},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-159351},
  pages     = {2119},
  year      = {2017},
  abstract  = {The prosocial tendencies measure (PTM; Carlo and Randall, 2002) is a widely used measurement for prosocial tendencies in English speaking participants. This instrument distinguishes between six different types of prosocial tendencies that partly share some common basis, but also can be opposed to each other. To examine these constructs in Germany, a study with 1067 participants was conducted. The study investigated the structure of this German version of the PTM-R via exploratory factor analysis, confirmatory factor analysis, correlations with similar constructs in subsamples as well as via measurement invariance test concerning the original English version. The German translation showed a similar factor structure to the English version in exploratory factor analysis and in confirmatory factor analysis. Measurement invariance was found between the English and German language versions of the PTM and support for the proposed six-factor structure (altruistic, anonymous, compliant, dire, emotional and public prosocial behavior) was also found in confirmatory factor analysis. Furthermore, the expected interrelations of these factors of prosocial behavior tendencies were obtained. Finally, correlations of the prosocial behavior tendencies with validating constructs and behaviors were found. Thus, the findings stress the importance of seeing prosocial behavior not as a single dimension construct, but as a factored construct which now can also be assessed in German speaking participants.},
  language  = {en}
}
@article{WangZhangBaietal.2017,
  author    = {Wang, Yiwen and Zhang, Zhen and Bai, Liying and Lin, Chongde and Osinsky, Roman and Hewig, Johannes},
  title     = {Ingroup/outgroup membership modulates fairness consideration: neural signatures from ERPs and EEG oscillations},
  series = {Scientific Reports},
  volume    = {7},
  journal   = {Scientific Reports},
  doi       = {10.1038/srep39827},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-181461},
  year      = {2017},
  abstract  = {Previous studies have shown that ingroup/outgroup membership influences individual's fairness considerations. However, it is not clear yet how group membership influences brain activity when a recipient evaluates the fairness of asset distribution. In this study, subjects participated as recipients in an Ultimatum Game with alleged members of both an experimentally induced ingroup and outgroup. They either received extremely unequal, moderately unequal, or equal offers from proposers while electroencephalogram was recorded. Behavioral results showed that the acceptance rates for unequal offers were higher when interacting with ingroup partners than with outgroup partners. Analyses of event related potentials revealed that proposers' group membership modulated offer evaluation at earlier processing stages. Feedback-related negativity was more negative for extremely and moderately unequal offers compared to equal offers in the ingroup interaction whereas it did not show differential responses to different offers in the outgroup interaction. Analyses of event related oscillations revealed that the theta power (4-6 Hz) was larger for moderately unequal offers than equal offers in the ingroup interaction whereas it did not show differential responses to different offers in the outgroup interaction. Thus, early mechanisms of fairness evaluation are strongly modulated by the ingroup/outgroup membership of the interaction partner.},
  language  = {en}
}