@article{RieplMusselOsinskyetal.2016,
  author    = {Riepl, Korbinian and Mussel, Patrick and Osinsky, Roman and Hewig, Johannes},
  title     = {Influences of State and Trait Affect on Behavior, Feedback-Related Negativity, and P3b in the Ultimatum Game},
  series = {PLoS One},
  volume    = {7},
  journal   = {PLoS One},
  number    = {11},
  doi       = {10.1371/journal.pone.0146358},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-147386},
  pages     = {e0146358},
  year      = {2016},
  abstract  = {The present study investigates how different emotions can alter social bargaining behavior. An important paradigm to study social bargaining is the Ultimatum Game. There, a proposer gets a pot of money and has to offer part of it to a responder. If the responder accepts, both players get the money as proposed by the proposer. If he rejects, none of the players gets anything. Rational choice models would predict that responders accept all offers above 0. However, evidence shows that responders typically reject a large proportion of all unfair offers. We analyzed participants' behavior when they played the Ultimatum Game as responders and simultaneously collected electroencephalogram data in order to quantify the feedback-related negativity and P3b components. We induced state affect (momentarily emotions unrelated to the task) via short movie clips and measured trait affect (longer-lasting emotional dispositions) via questionnaires. State happiness led to increased acceptance rates of very unfair offers. Regarding neurophysiology, we found that unfair offers elicited larger feedback-related negativity amplitudes than fair offers. Additionally, an interaction of state and trait affect occurred: high trait negative affect (subsuming a variety of aversive mood states) led to increased feedback-related negativity amplitudes when participants were in an angry mood, but not if they currently experienced fear or happiness. We discuss that increased rumination might be responsible for this result, which might not occur, however, when people experience happiness or fear. Apart from that, we found that fair offers elicited larger P3b components than unfair offers, which might reflect increased pleasure in response to fair offers. Moreover, high trait negative affect was associated with decreased P3b amplitudes, potentially reflecting decreased motivation to engage in activities. We discuss implications of our results in the light of theories and research on depression and anxiety.},
  language  = {en}
}
@article{MusselUlrichAllenetal.2016,
  author    = {Mussel, Patrick and Ulrich, Nathalie and Allen, John J. B. and Osinsky, Roman and Hewig, Johannes},
  title     = {Patterns of theta oscillation reflect the neural basis of individual differences in epistemic motivation},
  series = {Scientific Reports},
  volume    = {6},
  journal   = {Scientific Reports},
  doi       = {10.1038/srep29245},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-146957},
  pages     = {29245},
  year      = {2016},
  abstract  = {Theta oscillations in the EEG have been shown to reflect ongoing cognitive processes related to mental effort. Here, we show that the pattern of theta oscillation in response to varying cognitive demands reflects stable individual differences in the personality trait epistemic motivation: Individuals with high levels of epistemic motivation recruit relatively more cognitive resources in response to situations possessing high, compared to low, cognitive demand; individuals with low levels do not show such a specific response. Our results provide direct evidence for the theory of the construct need for cognition and add to our understanding of the neural processes underlying theta oscillations. More generally, we provide an explanation how individual differences in personality traits might be represented on a neural level.},
  language  = {en}
}
@article{MusselGoeritzHewig2013,
  author    = {Mussel, Patrick and G{\"o}ritz, Anja S. and Hewig, Johannes},
  title     = {The value of a smile: Facial expression affects ultimatum-game responses},
  series = {Judgment and Decision Making},
  volume    = {8},
  journal   = {Judgment and Decision Making},
  number    = {3},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-129639},
  pages     = {381-385},
  year      = {2013},
  abstract  = {In social interaction, the facial expression of an opponent contains information that may influence the interaction. We asked whether facial expression affects decision-making in the ultimatum game. In this two-person game, the proposer divides a sum of money into two parts, one for each player, and then the responder decides whether to accept the offer or reject it. Rejection means that neither player gets any money. Results of a large-sample study support our hypothesis that offers from proposers with a smiling facial expression are more often accepted, compared to a neutral facial expression. Moreover, we found lower acceptance rates for offers from proposers with an angry facial expression.},
  language  = {en}
}
@article{RodriguesLiesnerReutteretal.2020,
  author    = {Rodrigues, Johannes and Liesner, Marvin and Reutter, Mario and Mussel, Patrick and Hewig, Johannes},
  title     = {It's costly punishment, not altruistic: Low midfrontal theta and state anger predict punishment},
  series = {Psychophysiology},
  volume    = {57},
  journal   = {Psychophysiology},
  number    = {8},
  doi       = {10.1111/psyp.13557},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-214696},
  year      = {2020},
  abstract  = {Punishment in economic games has been interpreted as "altruistic." However, it was shown that punishment is related to trait anger instead of trait altruism in a third-party dictator game if compensation is also available. Here, we investigated the influence of state anger on punishment and compensation in the third-party dictator game. Therefore, we used movie sequences for emotional priming, including the target states anger, happy, and neutral. We measured the Feedback-Related Negativity (FRN) and midfrontal theta band activation, to investigate an electro-cortical correlate of the processing of fair and unfair offers. Also, we assessed single-trial FRN and midfrontal theta band activation as a predictor for punishment and compensation. We found that punishment was linked to state anger. Midfrontal theta band activation, which has previously been linked to altruistic acts and cognitive control, predicted less punishment. Additionally, trait anger led to enhanced FRN for unfair offers. This led to the interpretation that the FRN depicts the evaluation of fairness, while midfrontal theta band activation captures an aspect of cognitive control and altruistic motivation. We conclude that we need to redefine "altruistic punishment" into "costly punishment," as no direct link of altruism and punishment is given. Additionally, midfrontal theta band activation complements the FRN and offers additional insights into complex responses and decision processes, especially as a single trial predictor. },
  language  = {en}
}
@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{RodriguesNagowskiMusseletal.2018,
  author    = {Rodrigues, Johannes and Nagowski, Natalie and Mussel, Patrick and Hewig, Johannes},
  title     = {Altruistic punishment is connected to trait anger, not trait altruism, if compensation is available},
  series = {Heliyon},
  volume    = {4},
  journal   = {Heliyon},
  number    = {11},
  doi       = {10.1016/j.heliyon.2018.e00962},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-177669},
  pages     = {e00962},
  year      = {2018},
  abstract  = {Altruistic punishment and altruistic compensation are important concepts that are used to investigate altruism. However, altruistic punishment has been found to be correlated with anger. We were interested whether altruistic punishment and altruistic compensation are both driven by trait altruism and trait anger or whether the influence of those two traits is more specific to one of the behavioral options. We found that if the participants were able to apply altruistic compensation and altruistic punishment together in one paradigm, trait anger only predicts altruistic punishment and trait altruism only predicts altruistic compensation. Interestingly, these relations are disguised in classical altruistic punishment and altruistic compensation paradigms where participants can either only punish or compensate. Hence altruistic punishment and altruistic compensation paradigms should be merged together if one is interested in trait altruism without the confounding influence of trait anger.},
  language  = {en}
}
@article{RodriguesWeissMusseletal.2022,
  author    = {Rodrigues, Johannes and Weiß, Martin and Mussel, Patrick and Hewig, Johannes},
  title     = {On second thought … the influence of a second stage in the ultimatum game on decision behavior, electro-cortical correlates and their trait interrelation},
  series = {Psychophysiology},
  volume    = {59},
  journal   = {Psychophysiology},
  number    = {7},
  doi       = {10.1111/psyp.14023},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-318983},
  year      = {2022},
  abstract  = {Previous EEG research only investigated one stage ultimatum games (UGs). We investigated the influence of a second bargaining stage in an UG concerning behavioral responses, electro-cortical correlates and their moderations by the traits altruism, anger, anxiety, and greed in 92 participants. We found that an additional stage led to more rejection in the 2-stage UG (2SUG) and that increasing offers in the second stage compared to the first stage led to more acceptance. The FRN during a trial was linked to expectance evaluation concerning the fairness of the offers, while midfrontal theta was a marker for the needed cognitive control to overcome the respective default behavioral pattern. The FRN responses to unfair offers were more negative for either low or high altruism in the UG, while high trait anxiety led to more negative FRN responses in the first stage of 2SUG, indicating higher sensitivity to unfairness. Accordingly, the mean FRN response, representing the trait-like general electrocortical reactivity to unfairness, predicted rejection in the first stage of 2SUG. Additionally, we found that high trait anger led to more rejections for unfair offer in 2SUG in general, while trait altruism led to more rejection of unimproving unfair offers in the second stage of 2SUG. In contrast, trait anxiety led to more acceptance in the second stage of 2SUG, while trait greed even led to more acceptance if the offer was worse than in the stage before. These findings suggest, that 2SUG creates a trait activation situation compared to the UG.},
  language  = {en}
}