Experimental Methods for Investigation of Shape Memory Based Elastocaloric Cooling Processes and Model Validation

Shape Memory Alloys (SMA) using elastocaloric cooling processes have the potential to be an environmentally friendly alternative to the conventional vapor ...

Saarland University

Ambivalence researchers often collapse separate measures of positivity and negativity into a single numerical index of ambivalence and refer to it as objective, operative, or potential ambivalence. The authors argue that this univariate approach to ambivalence models undermines the validity of subsequent statistical analyses because it confounds the effects of the index and its components. To remedy this situation, they demonstrate how the assumptions underlying the indices derived from the conflicting reactions model and similarity-intensity model can be tested using a multivariate approach to ambivalence models. On the basis of computer simulations and reanalyses of published moderator effects, the authors show that the frequently reported moderating influence of ambivalence on attitude effects may be a statistical artifact resulting from unmodeled correlations of positivity and negativity with attitude and the dependent variable. On the basis of extensive power analyses, they conclude that it may be extremely difficult to detect moderator effects of ambivalence in observational data. Therefore, they encourage ambivalence researchers to take an experimental approach to study design and a multivariate approach to data analysis.

The moderator effect that wasn't there: statistical problems in ambivalence research.

This article extends research on leader procedural fairness as well as the social identity model of leadership effectiveness (SIMOL) by demonstrating that leader prototypicality can act as a substitute for procedural fairness. Although procedural fairness in general and voice in particular have been found to have a robust positive influence on leader endorsement, the authors showed in an experimental scenario study and a correlational field study that the influence of voice on leader endorsement is substantially reduced when leaders are perceived as prototypical for the group that they lead and followers are highly identified with their group. Additionally, supportive of predictions of the SIMOL, leader prototypicality interacted with follower identification in predicting leader endorsement, such that prototypicality had a positive effect on leader endorsement, which was enhanced among high identifiers. Overall, these results suggest that leaders who are attuned to their followers' group identity can afford to go it alone, for the better or the worse. (PsycINFO Database Record (c) 2009 APA, all rights reserved).

Substitutes for procedural fairness: prototypical leaders are endorsed whether they are fair or not.

Guided by the Needs-Based Model of Reconciliation, we hypothesized that being a member of a victimized group would be associated with a threat to the status and power of one's ingroup, whereas being a member of a perpetrating group would threaten the image of the ingroup as moral and socially acceptable. A social exchange interaction through which victims feel empowered by their perpetrators and perpetrators feel accepted by their victims was thus predicted to enhance the parties' willingness to reconcile. Supporting the predictions across two experiments, members of the perpetrator group (Jews in Study 1 and Germans in Study 2) showed greater willingness to reconcile when they received a message of acceptance, rather than empowerment, from a member of the victimized group. Members of the victimized group (Arabs in Study 1 and Jews in Study 2) demonstrated the opposite effect. Applied and theoretical implications of these results are discussed.

Promoting reconciliation through the satisfaction of the emotional needs of victimized and perpetrating group members: the needs-based model of reconciliation.

Need for cognition (NFC) refers to an individual's tendency to engage in and enjoy effortful cognitive processing. So far, little attention has been paid to a systematic evaluation of the distinctiveness of NFC from traits with similar conceptualization and from intelligence. The present research contributes to filling this gap by examining the relation of NFC to well-established personality concepts (Study 1) and to a comprehensive measure of intelligence in a sample with broad educational backgrounds (Study 2). We observed NFC to be positively correlated with openness, emotional stability, and traits indicating goal orientation. Using confirmatory factor analysis and event-related potentials, incremental validity of NFC and openness to ideas was demonstrated, showing that NFC is more predictive of drive-related and goal-oriented behavior and attentional resource allocation. Regarding intelligence, NFC was more associated with fluid than with crystallized aspects of intelligence. Altogether, the results provide strong support for the conceptual autonomy of NFC.

Same or different? Clarifying the relationship of need for cognition to personality and intelligence.

Three general properties of social stereotypes are the perception of differences between ingroups and outgroups (intergroup differentiation), the perception of ingroups as having more desirable attributes than outgroups (ingroup favoritism), and the greater accuracy of ingroup perceptions (differential accuracy). We present and test an inductive-reasoning model that accounts for all 3 phenomena, and we explicate the relations among them. Based on empirical evidence, the model assumes that most people have a positive self-image, that they project these self-images more strongly to ingroups than to outgroups, and that their self-images are valid cues for judgments about social groups. Two minimal-group experiments using a crossed-categorization paradigm support the model and provide new evidence for underlying psychological processes.

Social perception as induction and inference: an integrative model of intergroup differentiation, ingroup favoritism, and differential accuracy.

Detecting nasty data with simple plots of complex models: comment on Brandt (2011).

How does the acquisition of information about a person affect the liking of that person? A recent set of studies suggests that liking decreases as people acquire more information (Norton, Frost, & Ariely, 2007). We test this "less-is-more" hypothesis along with an alternative hypothesis based on information integration theory. According to this alternative, people average available person information in an unbiased manner so that the liking of a person described by a random sample of any number of traits from a trait universe approximates the degree of liking that would be obtained if all trait information were known. The correlation between liking and the number of traits should be zero. We present the results of computer simulation and 2 empirical person-judgment studies. Using Bayesian analyses, we find that the evidence is more consistent with the information-integration hypothesis than with the "less-is-more" hypothesis.

More is not less: greater information quantity does not diminish liking.

Past research provides evidence that organizational identification is a key factor predicting employees’ behaviours during mergers and acquisitions. In particular, recent studies demonstrate that members of the subordinate merger partner, in contrast to the dominant group, often find it difficult to transfer their identification to the post-merger organization. To understand this difference between dominant and subordinate groups, we examined employees’ sense of projected continuity in the future. We argue that projected continuity mediates the differential relationships between pre-merger and post-merger identification and propose that pre-merger identification relates positively to projected continuity in the dominant group but negatively in the subordinate group. As a result, the overall relationship between pre- and post-merger identification should be reduced or eliminated in the subordinate compared with the dominant group. We tested our hypotheses in a survey (N = 492) distributed in a merger of two international pharmaceutical companies at the beginning of the post-merger integration and 15 months later. Results were consistent with our assumptions of a moderated mediation effect. We conclude that a key challenge in merger integration is to support high identifiers in the subordinate group in developing a projected continuity or a focus on ‘the bright tomorrow'.

Focusing on the bright tomorrow? A longitudinal study of organizational identification and projected continuity in a corporate merger.

Several experimental and cross-sectional studies have established the stress-buffering effect of social identification, yet few longitudinal studies have been conducted within this area of research. This study is the first to make use of a multilevel approach to disaggregate between- and within-person effects of social identification on subjective and endocrinological stress reactions. Specifically, we conducted a study with 85 prospective students during their 1-day aptitude test for a university sports program. Ad hoc groups were formed, in which students completed several tests in various disciplines together. At four points in time, salivary cortisol, subjective strain, and identification with their group were measured. Results of multilevel analyses show a significant within-person effect of social identification: The more students identified with their group, the less stress they experienced and the lower their cortisol response was. Between-person effects were not significant. Advantages of using multilevel approaches within this field of research are discussed.

Disaggregating Within- and Between-Person Effects of Social Identification on Subjective and Endocrinological Stress Reactions in a Real-Life Stress Situation.

Johannes Ullrich

Intelligent Material Systems Lab

Saarland University

Experimental Methods for Investigation of Shape Memory Based Elastocaloric Cooling Processes and Model Validation

Johannes Ullrich

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Saarland University

Experimental Methods for Investigation of Shape Memory Based Elastocaloric Cooling Processes and Model Validation

Intelligent Material Systems Lab