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Self-Control Training (SCT) and Brain Endurance Training (BET) are novel training modalities designed to enhance physical endurance by building fatigue resiliency. Despite their similarities, it has yet to be examined whether combining SCT and BET provides an additive or redundant/overlapping effect on endurance exercise performance. This study investigated the effects of SCT and combined SCT+BET on performance of a maximal exertion isometric resistance endurance task (high plank) and ratings of perceived exertion (RPE). Participants (N = 33) were randomized to engage in 4 weeks (18 training sessions) of SCT (isometric handgrip; n = 13), SCT+BET (10-minute cognitively demanding task, followed by SCT; n = 10), or no-training/control (n = 10). Isometric endurance performance trials were completed at pre-, mid-, and post-training. One-way analysis of covariance (ANCOVA) models were computed for each of the mid- and post-training trials (controlling for pre-training high-plank performance) to assess effects on performance. Results showed no significant effects of training on high plank performance between groups at mid-training; however, a large and significant effect for SCT compared to control was observed at post-training (p = .044, d = .961). No significant main effects or interaction effects were found for changes in RPE over time (p’s > .05). Findings support the use of SCT as an effective training method for physical endurance performance and suggest that BET may not offer additional performance benefit compared to SCT under the training and testing conditions used in this protocol. Future research should explore potential dose-response effects of SCT on performance and moderators such as trait self-control. / Thesis / Master of Science (MSc)

<p>The purpose of this study was to examine the effects of depleted self-regulation on skillful task performance. Participants completed a baseline dart-tossing task (20 tosses), and were instructed to toss as quickly and as close to the bulls-eye as possible when a particular cue light flashed. Participants then underwent a self-regulatory depleting (experimental) or a non-depleting (control) manipulation before completing a second round of dart tossing. Measures of accuracy, reaction time, and myoelectrical activity of the biceps and triceps were collected along with self-report measures of psychological resilience and trait self-control.</p> <p>As hypothesized, participants in the experimental condition had poorer mean accuracy at round two than control condition participants, as well as a significant decline in accuracy from round one to round two. These effects were moderated by trait self-control; experimental group participants with higher trait self-control were more accurate in round two than experimental group participants with lower trait self-control. Experimental group participants also demonstrated poorer consistency in accuracy compared to control group participants at round two, and a significant deterioration in consistency from round one to round two. The only significant finding regarding reaction time was that consistency improved significantly for the control group but not for the experimental group.</p> <p>The results of this study provide evidence that ego depletion effects occur for skill-based physical task performance, especially in regards to accuracy. These findings provide further support for the utility of the limited strength model and suggest that self-regulatory depletion can impact performance on skill-based physical tasks.</p> / Master of Science in Kinesiology

Females continue to be underrepresented in leadership despite research demonstrating that leadership effectiveness does not vary by leader gender (Paustian-Underdahl et al., 2014). The current study examines the gender bias in leadership through the lens of leadership perceptions and evaluations; in particular, how perceivers' ratings of a leader would change as a function of the leader's gender. Leadership judgments are based on the leader prototype activated in the perceiver and how consistent/inconsistent the leader is perceived to be with the activated prototype (Lord et al., 2001). Due to the mismatch between the communal-oriented female gender stereotype and agentic-oriented expectations of a successful leader (Eagly and Karau, 2002), it was expected that the female leader would be rated more negatively than the male leader. Furthermore, the perceiver's gender and prior engagement in emotion suppression are investigated as two additional factors that could bias information processing when evaluating leaders. Male perceivers, who tend to hold a stronger masculine understanding of leadership (Koenig et al., 2011), were expected to evaluate the female leader more harshly than the male leader. Additionally, those depleted of their finite self-regulatory resources due to prior emotion suppression (i.e. being in a state of ego depletion; Baumeister et al., 1998) were predicted to rely more heavily on their stereotypes when making subsequent judgments; hence, ego-depleted individuals would demonstrate more bias in their ratings of the female leader relative to the male leader. In the current study, participants were randomly assigned to an emotion suppression or no suppression condition as they watched funny clips from the comedy series "The Office''. Then, they watched four business videos featuring a leader and three business managers. Participants were also randomly assigned to one of the two versions of the business videos portraying either a male or female leader. Leadership perception and leader effectiveness ratings were collected after each of the four business videos, and leader competence and leader warmth ratings were measured once after all four videos. Additionally, behavior recognition accuracy of agentic and communal leadership behaviors that were displayed in the four business videos was assessed. Contrary to expectations, the study findings demonstrate a dominant female leader effect; the female leader was evaluated more favorably than the male leader on all four leader judgments. This was observed both within the repeated measures and overall leadership ratings. An ego depletion effect was also observed; ego-depleted individuals showed lower accuracy in behavior recognition ratings and more leniency in leader warmth ratings. Furthermore, ego-depleted individuals showed less discernment by giving higher leader effectiveness ratings over time compared to non-ego-depleted individuals. Perceiver gender did not meaningfully affect leadership judgments. The unexpected pattern of bias in favor of the female leader instead of against her suggests that the nature of gender and leader stereotypes may be changing; the incongruence between the female stereotype and leader expectations may be decreasing, leading to more favorable evaluations of the female leader by both male and female perceivers. Moreover, the ability to provide fair and accurate judgments of leader effectiveness is reduced when depleted. Limitations and future research directions are discussed. / Doctor of Philosophy / The gender gap persists in leadership; although leader effectiveness has not been found to vary by the leader's gender, female leaders tend to be perceived and evaluated more negatively than male leaders. One reason for this is the mismatch between societal expectations for how women are ideally expected to behave and the expectations associated with a successful leader. In this study, gender bias in leader judgments and behavior recognition accuracy is examined by a leader's gender. Additionally, the perceiver's gender and prior engagement in emotion suppression are studied as two additional factors that can influence bias in leader ratings. Study findings demonstrate an unexpected but dominant female leader effect, where the female leader was perceived as more leader-like and rated more effective, more competent, and warmer than the male leader by both male and female perceivers. The amount of self-regulatory resources available also affected subsequent processing capabilities; those who suppressed their emotions and were depleted of their self-regulatory resources were less accurate in their behavior recognition ratings and were more lenient in their leader warmth ratings. Future research should explore if and how the nature of gender and leader stereotypes are changing, as evaluations of female leaders may not be as negatively-biased as it was previously.

Within western societies the act of consumption is not merely concerned with satisfying basic human needs. Rather, consumption has become a source of leisure and self expression for the masses (Belk, 1988). This has meant that humankind’s wants have tended to outstrip the world’s finite resources available, leading to environmental damage, questionable farming practice and the widespread abuse of human labour. In response to these issues the phenomena of ethical consumption was born. Ethical consumption attempts to limit the environmental, human and animal costs of our spending via the favouring of products that are deemed to be for the betterment of wider society. At face value ethical consumption has been hugely successful in terms of market share, with sales of products stressing their ethical credentials having grown rapidly in recent years (Cooperative Bank 2011). However, despite this success, ethically branded products still represent a minority of purchases (Thøgersen, 2006). Psychological research exploring the reasons why consumers purchase ethically is dominated by papers focusing upon consumers’ attitudes, values and intentions (Andorfer & Liebe, 2012, Milfont & Duckitt, 2004). However, consumers’ attitudes do not always mirror actual spending (Auger, Burke, Devinney & Louviere., 2003; Auger & Devinney, 2007). Whilst one third of consumers describe themselves as being ethical spenders, only 1-3% of products purchased are Fair Trade certified (Cowe & Williams, 2000). The divergence between attitude and behaviour has been referred to as the ‘ethical purchasing gap’ (Andorfer & Liebe, 2012, Clayton & Brook, 2005). One factor that may be partially responsible for the divergence between purchase intention and actual behaviours is self-regulatory fatigue (ego depletion). Chapter one of the thesis presents the argument for ethical spending being affected by, amongst other things, our ability to suppress our impulsive desires via a process known as self-regulation (Bagozzi, 1992; Baumeister, 2002; Baumeister & Vohs, 2007). According to the self-regulatory fatigue literature, self-control requires the expenditure of blood glucose (Gailliot, 2008, Inzlicht & Gutsell, 2007). However, the available level of blood glucose temporarily diminishes with continued use of the self-regulatory system. In response to the lower availability of blood glucose, individuals begin to limit all non-essential cognitive expenditure, including further acts of self-regulation. Individuals who have exhausted their capacity for self control are said to be ego depleted or in a state of self-regulatory fatigue (Baumeister & Heatherton, 1996; Hofmann. Friese & Strack, 2009; Muraven & Baumeister, 2000) Chapter one argues that self-regulatory fatigue may restrict an individual’s capacity to consider the social and long-term impacts of their spending to resist the temptation of cheap consumer goods. As a result, it is predicted that ethical spending may be negatively affected by self-regulation fatigue. Following this theoretical foundation, Chapter two presents the methodological rationale for the research project that set out to test various aspects of this foundational hypothesis. Chapter three presents the findings of the first empirical study. The purpose of the study was to use open-ended questionnaires to explore the principles that guided participants’ spending, as well gaining an insight into instances where there was a discrepancy between spending and principle. The study is included within the thesis primarily to show the genesis of the research agenda. The study indicated that consumers within the sample were primarily concerned with traditional forms of ethical consumption, namely environmental, human and animal welfare concerns. Participants justified non-principled purchasing as being a result of financial consideration or impulsive urge. It was thus decided to explore the possibility that self-regulation fatigue may have a potentially negative impact upon ethical spending, due to its known relationship with impulsive spending (Vohs & Faber, 2007). Chapter four explores the effects of self-regulation fatigue upon socially-minded economic behaviour within the controlled setting of a social dilemma game. Ethical consumption can be considered to be a prime example of a ‘social dilemma’ in the sense that decisions relating to whether or not to consume ethically involve a direct conflict between an individual’s short term interests (e.g. to save money) and the collective interests of wider society (Gattig & Hendrickx, 2007; Milfont & Gouveiac, 2006). Therefore it was decided to measure the effects of self-regulatory fatigue within an experimental social dilemma task. The task used was based upon the forest game, which was first outlined by Sheldon and McGregor (2000), with the white bear thought suppression task (Wegner, Schneider, Carter, & White, 1987) being utilised to manipulate self-regulatory fatigue. The results revealed a clear divergence in behaviour within the game as a function of the manipulation of self-regulatory fatigue, with non-depleted groups sustaining the central resource longer than their depleted counterparts. Chapter five builds on the findings of chapter four through an exploration of the relationship between ego depletion and participants’ willingness to pay for ethical goods. The study utilised a discrete choice measure in order to measure participant’s willingness to pay for ethical goods. The findings did not show a significant effect of self-regulatory fatigue on the willingness to pay for ethical goods. However a potential explanation for this result was the fact that the decision-making processes involved in this study were less arduous than those required within a real-life shopping environment (or, for that matter, than the decisions required in the forest game reported in chapter four). It is possible that the complexity of the choice presented may have been insufficient for the decision to be negatively affected by self-regulatory fatigue. The study is thus included in order to illustrate the importance of utilising more realistic measures of spending that incorporate more of the complexity of decision-making required in real-world contexts. Chapter six presents four separate experiments exploring the relationship between self-regulatory fatigue and ethical spending. The first study utilised an online supermarket simulation and asked participants to go shopping for one week’s worth of groceries after either completing, or not completing, the white bear thought suppression task. The simulated supermarket allowed participants to select from a range of over 1900 products. The pattern of results indicated that participants in a state of self-regulatory fatigue spent significantly less on ethically branded products than their non-depleted counterparts. However, this was only true for individuals with a high food budget. Those with a low budget were not significantly affected, presumably due to having relatively little flexibility in terms of product choice and/or having established shopping habits focusing upon value. The second study in chapter six explored the ways in which social appeals interact with self-regulatory fatigue. Participants were presented with an attention control task before reading either an article praising students for their ethical behaviours or a control article. Participants were then asked to “go shopping” within the online store. Results once again indicated that self-regulatory fatigue reduced spending on ethically branded goods. However, contrary to predictions, the social appeal had no significant effect on levels of ethical spending either as a main effect or in interaction with self-regulatory fatigue.

Förmågan till effektiv självreglering är väsentlig för personers självpresentation. Enligt teorin om "ego depletion" är självreglering en begränsad resurs vilken tillfälligt försämras om den överanvänds. I en förhörssituation kan detta bli problematiskt eftersom en självuttömd självpresentation kan bidra till minskad trovärdighet och ökad mottaglighet för ledande frågor. Detta kan förstärkas om vittnesmålet dessutom erläggs på ett annat språk än modersmålet. Syftet med studien var att undersöka om annat vittnesspråk än modersmål påverkar trovärdighet och erhållandet av ledande frågor. I ett experiment fick 60 personer uppskatta trovärdighet och formulera frågor till svenska respektive engelska vittnesmål. Därefter fick 12 oberoende personer skatta frågornas suggestibilitet. Resultatet visade att engelska vittnesmål (andraspråk) tenderade erhålla lägre trovärdighetsskattningar vilket kan bero på uttömd självreglering och misslyckade självpresentationer. Detta antyder att språk har inverkan på trovärdighet. Trots detta uppvisades ingen skillnad i andel ledande frågor beroende på språk. Framtida studier uppmanas testa effekten av "ego depletion" i autentiska förhörssituationer.

Language barriers in eyewitness testimonies may pose threats toward witnesses’ accuracy, and consequently on the outcome of judicial procedures. The present study aims to investigate the credibility and the extent of reported detail information of eyewitnesses’ testimony of a crime event, when the testimony is given in witnesses’ first language, second language, or second language through interpreter. Moreover, the study examines whether eyewitness suggestibility is affected by the language to which the testimony is provided. Participants (N=60) were exposed to a mock crime event and subsequently performed memory tests about that event. Results showed no differences in accuracy of suggestibility between experimental conditions. The personality trait social desirability showed no relation to suggestibility or the extent of inaccurate detail information provided in the present study. The findings are discussed in the context of implications, limitations and future directions.

In unserer hierarchisch organisierten Gesellschaft prägen Machtunterschiede das alltägliche Leben. Personen in Machtpositionen haben Kontrolle über andere Personen, verfügen über mehr materielle und immaterielle Ressourcen und erreichen dadurch ihre eigenen Ziele leichter als Personen ohne Machtbefugnisse. Macht bewirkt aber auch Veränderungen innerhalb einer Person. So beeinflusst Macht beispielsweise die Art und Weise, wie wir unser eigenes Verhalten steuern und unsere Ziele angehen. Für die erfolgreichere Umsetzung eigener Ziele durch mächtige Personen werden vor allem kognitive Prozesse verantwortlich gemacht. Motivationale und selbstregulatorische Prozesse scheinen ebenso wichtig für die Erklärung des Phänomens, wurden bisher zur Erklärung aber kaum herangezogen. Das Ziel dieser Arbeit ist es zu klären, ob und wie Macht unsere Fähigkeit beeinflusst, unser eigenes Verhalten zu steuern und uns selbst zu kontrollieren. Dazu werden zwei Formen der Selbstregulation unterschieden (Kuhl, 2000; Ryan & Deci, 2000): selbstintegrierte, autonome und selbstdiskrepante, kontrollierte Regulation. Beide wirken sich unterschiedlich auf funktionale Komponenten von Selbstregulation wie z. B. die Selbstregulationsressourcen aus. In drei Studienreihen wurde gezeigt, dass das Machtausmaß und die Machtform die Art der Selbstregulation und ihre funktionalen Komponenten beeinflussen. In der ersten Studienreihe wurde der Einfluss von Macht auf die Verfügbarkeit und den Verbrauch von Selbstregulationsressourcen auf drei Ebenen untersucht: auf der Verhaltensebene, experientiell und physiologisch. In den ersten beiden Studien zeigte sich, dass Versuchspersonen nach einem Machtpriming länger bei einer Selbstkontrollaufgabe durchhielten und sich vitaler und weniger erschöpft fühlten als nach einem Machtlosigkeitspriming. In der dritten Studie zeigte sich außerdem, dass Versuchspersonen während einer anstrengenden Aufgabe umso weniger physiologischer Ressourcen verbrauchten, umso mächtiger sie sich vor der Bearbeitung fühlten. Mediiert wurde dieser Effekt über eine Zunahme autonomer Selbstregulation. In der zweiten Studienreihe wurde untersucht, wie die Art der Selbstregulation und die Selbstregulationsressourcen von zwei unterschiedlichen Formen der Macht beeinflusst werden: persönliche Macht (der Unabhängigkeit von anderen) und soziale Macht (der Kontrolle über andere). Beide Formen von Macht sind mit dem Gefühl von Kontrolle verbunden und sollten deshalb zu einer autonomeren Selbstregulation und vermehrter Selbstregulationskapazität führen. Aufgrund der stärkeren Fokussierung auf andere sollte soziale Macht außerdem kontrollierte Selbstregulation verstärken und damit Erschöpfung und Stress erhöhen, während der vermehrte Fokus auf die eigenen Interessen im Zusammenhang mit persönlicher Macht beides verringern sollte. Die Ergebnisse beider Studien bestätigten diese Annahmen. In einem dritten Forschungsstrang wurde festgestellt, dass Macht sich auch auf die Effektivität automatischer Selbstregulationsmechanismen auswirkt. Der Affekttransfer von Zielen zu dazugehörenden Aktivitäten bewirkt folgenden Prozess: je mehr positiven Affekt eine Person mit einem Ziel verbindet, umso positiver erlebt sie Aktivitäten, die sie dem Ziel näher bringen. Während dieser Selbstregulations-mechanismus bei Mächtigen reibungslos abläuft, ist er bei Machtlosen blockiert. Dies zeigte sich in allen drei Studien. Weitere Analysen untermauerten wiederum die Rolle der autonomen Selbstregulation als Mediator, denn es zeigte sich, dass Macht die autonome Selbstregulation erhöht und dadurch den Affekttransfer ermöglicht. Insgesamt versetzt Macht Menschen in die Lage, ihr eigenes Verhalten erfolgreicher zu regulieren und zu kontrollieren. Denn Macht erhöht die verfügbaren Selbstregulationsressourcen und beeinflusst die Wirkungsweise eines automatischen Selbstregulationsmechanismus positiv. Diesen Effekten liegt der Einfluss von Macht auf autonome und kontrollierte Selbstregulation zugrunde. Abschließend werden die theoretischen und praktischen Implikationen dieser Befunde diskutiert.

Seit ca. 20 Jahren versuchen Forscher Antezedenzien von Adaptation bzw. erfolgreicher Anpassung an Veränderungen zu identifizieren. Die Befundlage ist jedoch inkonsistent, sodass mit der vorliegenden Arbeit eine Synthese der Zusammenhänge zwischen ausgewählten Faktoren und Adaptation angestrebt wird. Darüber hinaus wird der Einfluss eines bisher vernachlässigten Faktors experimentell untersucht. In der ersten Studie wurden die Zusammenhänge zwischen kognitiven Fähigkeiten und Adaptation metaanalytisch zusammengefasst. Die Metaanalyse (119 Effektstärken aus 42 Studien) ergab, dass die kognitiven Fähigkeiten adaptationsförderlich sind (r = .21). Allerdings wurden große Unterschiede zwischen den einzelnen Effektstärken identifiziert, die teilweise auf die Messmethode der Adaptation zurückgeführt werden konnten. Stärkere Zusammenhänge konnten unter Verwendung objektiver Adaptationsmaße (z. B. Genauigkeit als Aufgabenleistung) beobachtet werden. Im Rahmen von Studie 2 wurden Zielorientierungsdimensionen als Korrelate von Adaptation metaanalytisch untersucht (88 Effektstärken aus 23 Studien). Auch in dieser Metaanalyse war die Messmethode von Adaptation relevant, da stärkere Zusammenhänge bei subjektiven Adaptationsmaßen (z. B. selbstberichtete Adaptation) gefunden wurden. In Studie 3 wurde der Einfluss der Ego-Depletion auf adaptive Leistung experimentell untersucht (n = 139). Entgegen der Hypothese gab es keine Hinweise auf eine Beeinträchtigung der adaptiven Leistung durch Erschöpfung der Selbstkontrollressourcen. Es konnte jedoch der aus Studie 1 bekannte adaptationsförderliche Einfluss der kognitiven Fähigkeiten nachgewiesen werden.

Previous research has shown that exerting self-control on a demanding task can impair performance on a subsequent demanding self-control task. This phenomenon is known as ego-depletion; however, its underlying mechanisms are not well understood. Notable gaps in the literature exist regarding whether participants’ motivation levels can attenuate the depletion effect, and whether trait self-control is related. Drawing from the process model of depletion and the self-determination theory, the goal of the study was to examine whether motivational incentives in the form of autonomy can impact performance on tasks in an ego-depleted state, and the potential relationship of trait self-control. Amazon Mechanical Turk was utilized to conduct this experimental quantitative study with a 2 (ego-depletion: yes or no) x 2 (autonomous reward motivation: incentivized or nonincentivized) between-subjects factorial design. The effects of an autonomous motivational incentive were compared with the effects of no incentive on a convenience sample of online participants (N = 211), half of whom performed a task designed to be depleting of self-control resources, and half of whom performed a non-depleting task instead. Multivariate ANCOVAs showed no significant differences for performance on a subsequent self-control task for any of the experimental groups, and no co-variance of trait self-control was found (as measured by the Brief Self-Control Scale). This study will contribute to social change by increasing understanding of the factors contributing to self-control. This knowledge will be useful to anyone intending to strengthen their own willpower and achieve their goals, and may enable practitioners to better assist clients struggling with addictions and other maladaptive behaviors.