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Dive into the research topics where Janka I. Stoker is active.

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Featured researches published by Janka I. Stoker.


Psychological Science | 2009

Differentiating Social and Personal Power: Opposite Effects on Stereotyping, but Parallel Effects on Behavioral Approach Tendencies

Joris Lammers; Janka I. Stoker; Diederik A. Stapel

How does power affect behavior? We posit that this depends on the type of power. We distinguish between social power (power over other people) and personal power (freedom from other people) and argue that these two types of power have opposite associations with independence and interdependence. We propose that when the distinction between independence and interdependence is relevant, social power and personal power will have opposite effects; however, they will have parallel effects when the distinction is irrelevant. In two studies (an experimental study and a large field study), we demonstrate this by showing that social power and personal power have opposite effects on stereotyping, but parallel effects on behavioral approach.


Psychological Science | 2011

Power Increases Infidelity Among Men and Women

Joris Lammers; Janka I. Stoker; Jennifer Jordan; Monique Pollmann; Diederik A. Stapel

Data from a large survey of 1,561 professionals were used to examine the relationship between power and infidelity and the process underlying this relationship. Results showed that elevated power is positively associated with infidelity because power increases confidence in the ability to attract partners. This association was found for both actual infidelity and intentions to engage in infidelity in the future. Gender did not moderate these results: The relationship between power and infidelity was the same for women as for men, and for the same reason. These findings suggest that the common assumption (and often-found effect) that women are less likely than men to engage in infidelity is, at least partially, a reflection of traditional gender-based differences in power that exist in society.


Journal of Business and Psychology | 2012

Factors Relating to Managerial Stereotypes: The Role of Gender of the Employee and the Manager and Management Gender Ratio

Janka I. Stoker; Mandy van der Velde; Joris Lammers

PurposeSeveral studies have shown that the traditional stereotype of a “good” manager being masculine and male still exists. The recent changes in the proportion of women and female managers in organizations could affect these two managerial stereotypes, leading to a stronger preference for feminine characteristics and female leaders. This study examines if the gender of an employee, the gender of the manager, and the management gender ratio in an organization are related to employees’ managerial stereotypes.Design/Methodology/Approach3229 respondents working in various organizations completed an electronic questionnaire.FindingsThe results confirm our hypotheses that, although the general stereotype of a manager is masculine and although most prefer a man as a manager, female employees, employees with a female manager, and employees working in an organization with a high percentage of female managers, have a stronger preference for feminine characteristics of managers and for female managers. Moreover, we find that proximal variables are much stronger predictors of these preferences than more distal variables.ImplicationsOur study suggests that managerial stereotypes could change as a result of personal experiences and changes in the organizational context. The results imply that increasing the proportion of female managers is an effective way to overcome managerial stereotyping.Originality/ValueThis study examines the influence on managerial stereotypes of various proximal and distal factors derived from theory among a large group of employees (in contrast to students).


International Journal of Human Resource Management | 2009

Development and performance of self-managing work teams: a theoretical and empirical examination

Ben Kuipers; Janka I. Stoker

Several theories have been developed that prescribe the team development of self-managing work teams (SMWTs). Some of these have led to models with successive linear developmental phases. However, both the theory and the empirical data show little support for these models. Based on an extensive review of team development literature, we propose, instead of linear phases, describing team development in three general team processes. These processes, internal relations, task management, and external relations and improvement, were empirically explored in a longitudinal field-study of more than 150 blue-collar and white-collar SMWTs in a Volvo plant in Sweden. The three processes were found to be consistent over time and appeared to relate to one-year-later objective SMWT performance measures for product quality, the incidence of sick-leave and long-term sick-leave. Based on these findings, a result-oriented team development approach is proposed, in which the achieved results determine the processes followed to develop SMWTs further. Also, managers and HR practitioners are encouraged to monitor the three ongoing team processes and to relate these to the desired team performance. Such an analysis should be the starting point of a dialogue between manager and team to improve the functioning and performance of SMWTs.


Personnel Review | 2008

Effects of team tenure and leadership in self‐managing teams

Janka I. Stoker

Purpose – This study seeks to identify the relationship between leader behaviour and the effectiveness of the members of a self‐managing team (SMT) in terms of perceived individual performance and emotional exhaustion. In particular, it aims to examine the moderating role of individual team tenure.Design/methodology/approach – A questionnaire study was conducted involving 154 team members of 21 SMTs. Two leadership dimensions were measured, plus team tenure and effectiveness (in terms of perceived individual performance and emotional exhaustion) of the individuals involved.Findings – Team members with a short team tenure reported higher levels of individual performance when their team leader demonstrated directive behaviour. Conversely, these relatively new team members reported lower levels of individual performance and experienced greater emotional exhaustion when their team leader adopted coaching behaviour. For team members with longer team tenure, however, individual performance was greater and emoti...


International Journal of Human Resource Management | 2012

Climate control? The relationship between leadership, climate for change, and work outcomes

F. M. de Poel; Janka I. Stoker; K. I. van der Zee

Transformational leadership is seen as one of the most effective leadership styles from which the dynamic context of temporary work agencies may benefit. The current paper presents a theoretical framework that introduces participative leadership as an additional appropriate leadership style. The prediction is that transformational leadership and participative leadership both impact work outcomes via a climate for change. Data from 258 employees working for a large Dutch employment agency support these hypotheses. Results show that transformational leadership and participative leadership are both independently related to work outcomes. Moreover, results support an indirect process from participative leadership to work outcomes, via a climate for change.


Psychological Science | 2012

Influence in Times of Crisis How Social and Financial Resources Affect Men’s and Women’s Evaluations of Glass-Cliff Positions

Floor Rink; Michelle K. Ryan; Janka I. Stoker

In two scenario-based studies, we found that women and men evaluate glass-cliff positions (i.e., precarious leadership positions at organizations in crisis) differently depending on the social and financial resources available. Female and male participants evaluated a hypothetical leadership position in which they would have both social and financial resources, financial resources but no social resources, or social resources but no financial resources. Women evaluated the position without social resources most negatively, whereas men evaluated the position without financial resources most negatively. In Study 2, we found that women and men considered different issues when evaluating these leadership positions. Women’s evaluations and expected levels of influence as leaders depended on the degree to which they expected to be accepted by subordinates. In contrast, men’s evaluations and expected levels of acceptance by subordinates depended on the degree to which they expected to be influential in the position. Our findings have implications for the understanding of the glass-cliff phenomenon and gendered leadership stereotypes.


Personality and Social Psychology Bulletin | 2016

To Have Control Over or to Be Free From Others? The Desire for Power Reflects a Need for Autonomy

Joris Lammers; Janka I. Stoker; Floortje Rink; Adam D. Galinsky

The current research explores why people desire power and how that desire can be satisfied. We propose that a position of power can be subjectively experienced as conferring influence over others or as offering autonomy from the influence of others. Conversely, a low-power position can be experienced as lacking influence or lacking autonomy. Nine studies show that subjectively experiencing one’s power as autonomy predicts the desire for power, whereas the experience of influence over others does not. Furthermore, gaining autonomy quenches the desire for power, but gaining influence does not. The studies demonstrated the primacy of autonomy across both experimental and correlational designs, across measured mediation and manipulated mediator approaches, and across three different continents (Europe, United States, India). Together, these studies offer evidence that people desire power not to be a master over others, but to be master of their own domain, to control their own fate.


Group & Organization Management | 2014

Leadership and organizational tenure diversity as determinants of project team effectiveness

Frouke M. de Poel; Janka I. Stoker; Karen I. van der Zee

The present study reveals how leadership effectiveness in project teams is dependent on the level of organizational tenure diversity. Data from 34 project teams showed that transformational leadership is related to organizational commitment, creative behavior, and job satisfaction, but only in teams with high organizational tenure diversity. By contrast, participative leadership has no impact on team innovativeness, team performance, and team conflict in teams with high organizational tenure diversity, yet is beneficial with respect to the same outcomes in teams that are low in organizational tenure diversity. Theoretical and practical implications for leading project teams and future research in this area are discussed.


PLOS ONE | 2016

The Facial Appearance of CEOs : Faces Signal Selection but Not Performance

Janka I. Stoker; Harry Garretsen; Luuk J. Spreeuwers

Research overwhelmingly shows that facial appearance predicts leader selection. However, the evidence on the relevance of faces for actual leader ability and consequently performance is inconclusive. By using a state-of-the-art, objective measure for face recognition, we test the predictive value of CEOs’ faces for firm performance in a large sample of faces. We first compare the faces of Fortune500 CEOs with those of US citizens and professors. We find clear confirmation that CEOs do look different when compared to citizens or professors, replicating the finding that faces matter for selection. More importantly, we also find that faces of CEOs of top performing firms do not differ from other CEOs. Based on our advanced face recognition method, our results suggest that facial appearance matters for leader selection but that it does not do so for leader performance.

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Floor Rink

University of Groningen

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