The focus of this thesis was the hedonic value of stimuli, which is more commonly known as pleasure or positive affect. First, the scientific meaning of hedonic value was dissected. Second, a classification identifying core causes of positive affect was created. The classification was derived from specific positive moments reported by individuals throughout a day (collected through experience sampling methodology). Seventeen triggers of positive affect were identified, which were extracted from the data rather than originating from theory. Third, affective influences on reflexive-like motor responses were investigated using an approach-avoidance task. Contrary to previous studies, approach reaction times were not speeded by highly affective stimuli. Instead, a novel non-emotional effect was found on reaction times, which could directly explain the current results, and those of previous studies, in non-affective terms. Fourth, the propagation of hedonic reactivity from pleasurable to neutral stimuli was investigated. Contrary to expectations, the evaluative conditioning procedure utilised did not exhibit a phenomenon called blocking. Instead, 'liking' spread non-selectively to all stimuli co-occurring with the source hedonic stimulus. Fifth, the positive effect of pleasure on goal-directed motivation was established: participants were found to press a food trigger harder for highly palatable snacks compared to bland snacks, even though participants were not informed about the hidden measurement of forces. Additionally, the impact of hedonic value on actual food intake was quantified with best-fit equations that predicted consumption at both the group and individual level. In the last study, hedonic habituation, or the inhibitory effect of pleasure on itself, was demonstrated: eating pleasant snacks, as compared to bland ones, reduced the hedonic ratings of test foods that were consumed afterwards. Finally, these inputs and outputs of hedonics were integrated into a model specifying principal roles of pleasure in human behaviour. This pleasure-incentive model explains the effects of pleasure on incentive motivation, and makes important predictions about the mechanisms of pathological conditions such as over-eating and drug addiction.

Spending your time „nurturing what is right‟ enables people to grow and negotiate the problems of life which is more than only fixing what is wrong. The World Health Organisation also defined well-being as more than not ill-being. Flourishing is an optimal state of well-being. The question is, „what is it that flourishers do different from non-flourishers?‟ Pharmacy students prepare themselves for a profession which is being bombarded with change; they are the pharmacists of tomorrow. Among them some students flourish and the others do not. This study aimed to look at possible pathways to flourishing that flourishers utilise. In this way the study addressed several gaps in the knowledge regarding flourishing: 1) The prevalence of flourishing among pharmacy students, 2) The role of demands and resources in flourishing of students, 3) The role of antecedent factors of basic psychological need satisfaction on the basic psychological need satisfaction of students and therefore in their flourishing, and 4) The use of positive affect regulation (an internal strategy) as a pathway to flourishing. A cross-sectional design was utilised. The study population was all the enrolled pharmacy students at the North West University during 2014. A convenience sample of 779 students participated. The measuring battery consisted of the Mental Health Continuum-Short Form (MHC-SF; Keyes, 2009), the Emotional Regulation Profile-Revised (ERP-R; Nelis, Quoidbach, Hansenne, & Mikolajczak, 2011), the Balanced Measure of Psychological Needs (BMPN; Sheldon & Hilpert, 2012), statements about the antecedents of basic psychological need satisfaction and statements about demands and resources, developed for the purpose of this study, and a demographic questionnaire. Structural equation modelling, invariance testing and latent class analysis were some of the statistical techniques used to analyse the cross-sectional data. Manuscript one addressed the prevalence of flourishing among pharmacy students as well as possible differences between the year groups. The manuscript also investigated the role of workload as a study demand and the lecturer as a study resource and the possible interaction between them in the flourishing of students. Year group as a possible moderator in the respective relationships between demands, resources, the interaction between them on the one hand and flourishing on the other, were also assessed. 40% of the group flourished whilst 57% was moderately healthy and 3% languished. The different year groups negotiated the demands and resources in their study environment differently in their path to flourishing. The possible pathways to flourishing in this context were identified as the use of lecturer support (a resource), especially when the workload (a demand) is high and the successful negotiation of workload over their four years of study. Manuscript two dealt with the impact of antecedent factors of basic psychological need satisfaction of pharmacy students on their basic psychological need satisfaction and therefore ultimately the influence of these contextual factors on their flourishing. The researcher wanted to determine whether there is a difference in the role(s) that family, peers, lecturers and workload play in the satisfaction of the students‟ basic psychological needs (relatedness, competence and autonomy). Year group as a moderator in these respective relationships was also investigated. Family and peers played the most important role in need satisfaction of students. However, lecturers can actively engage in supporting the need satisfaction of students, which would increase their levels of autonomous motivation and thereby their levels of flourishing. In manuscript three the use of internal strategies as pathways to flourishing were explored. Positive emotion regulation strategies have a positive relationship with well-being. However, a person can dampen or savour his or her positive emotions. The students were clustered into distinctive groups by means of a latent class analysis. Three distinctive groups were posterior identified based on the characteristics of group members, namely flourishers, languishers and moderately healthy students. Regression analyses of the three groups revealed that flourishers are the only group that most likely will utilise savouring positive emotion regulation strategies and refrain from utilising dampening positive emotion regulation strategies. Pathways to flourishing that flourishing pharmacy students utilise are therefore the use of savouring positive emotion regulation strategies and the non-use of dampening positive emotion regulation strategies.

Spending your time „nurturing what is right‟ enables people to grow and negotiate the problems of life which is more than only fixing what is wrong. The World Health Organisation also defined well-being as more than not ill-being. Flourishing is an optimal state of well-being. The question is, „what is it that flourishers do different from non-flourishers?‟ Pharmacy students prepare themselves for a profession which is being bombarded with change; they are the pharmacists of tomorrow. Among them some students flourish and the others do not. This study aimed to look at possible pathways to flourishing that flourishers utilise. In this way the study addressed several gaps in the knowledge regarding flourishing: 1) The prevalence of flourishing among pharmacy students, 2) The role of demands and resources in flourishing of students, 3) The role of antecedent factors of basic psychological need satisfaction on the basic psychological need satisfaction of students and therefore in their flourishing, and 4) The use of positive affect regulation (an internal strategy) as a pathway to flourishing. A cross-sectional design was utilised. The study population was all the enrolled pharmacy students at the North West University during 2014. A convenience sample of 779 students participated. The measuring battery consisted of the Mental Health Continuum-Short Form (MHC-SF; Keyes, 2009), the Emotional Regulation Profile-Revised (ERP-R; Nelis, Quoidbach, Hansenne, & Mikolajczak, 2011), the Balanced Measure of Psychological Needs (BMPN; Sheldon & Hilpert, 2012), statements about the antecedents of basic psychological need satisfaction and statements about demands and resources, developed for the purpose of this study, and a demographic questionnaire. Structural equation modelling, invariance testing and latent class analysis were some of the statistical techniques used to analyse the cross-sectional data. Manuscript one addressed the prevalence of flourishing among pharmacy students as well as possible differences between the year groups. The manuscript also investigated the role of workload as a study demand and the lecturer as a study resource and the possible interaction between them in the flourishing of students. Year group as a possible moderator in the respective relationships between demands, resources, the interaction between them on the one hand and flourishing on the other, were also assessed. 40% of the group flourished whilst 57% was moderately healthy and 3% languished. The different year groups negotiated the demands and resources in their study environment differently in their path to flourishing. The possible pathways to flourishing in this context were identified as the use of lecturer support (a resource), especially when the workload (a demand) is high and the successful negotiation of workload over their four years of study. Manuscript two dealt with the impact of antecedent factors of basic psychological need satisfaction of pharmacy students on their basic psychological need satisfaction and therefore ultimately the influence of these contextual factors on their flourishing. The researcher wanted to determine whether there is a difference in the role(s) that family, peers, lecturers and workload play in the satisfaction of the students‟ basic psychological needs (relatedness, competence and autonomy). Year group as a moderator in these respective relationships was also investigated. Family and peers played the most important role in need satisfaction of students. However, lecturers can actively engage in supporting the need satisfaction of students, which would increase their levels of autonomous motivation and thereby their levels of flourishing. In manuscript three the use of internal strategies as pathways to flourishing were explored. Positive emotion regulation strategies have a positive relationship with well-being. However, a person can dampen or savour his or her positive emotions. The students were clustered into distinctive groups by means of a latent class analysis. Three distinctive groups were posterior identified based on the characteristics of group members, namely flourishers, languishers and moderately healthy students. Regression analyses of the three groups revealed that flourishers are the only group that most likely will utilise savouring positive emotion regulation strategies and refrain from utilising dampening positive emotion regulation strategies. Pathways to flourishing that flourishing pharmacy students utilise are therefore the use of savouring positive emotion regulation strategies and the non-use of dampening positive emotion regulation strategies.

Non-suicidal self-injury (NSSI) is increasingly understood as representing a public health concern and a behavioral marker of emotional and psychological distress among young people. NSSI is prevalent during the period of young adulthood, including among emerging adults pursuing a university education, yet the vulnerability factors associated with NSSI in this population merit more in-depth and contextualized investigation. The current dissertation's overarching objective was to better understand the risk context surrounding university students' engagement in NSSI. Using a sample of 2,579 students (75.2% female; Mage=18.97; SDage=1.54), Study 1 first explored the roles of parental (mother and father pressure) and intrapersonal (emotion dysregulation, academic coping, perfectionism subtypes) risk factors in university students’ likelihood and frequency of engagement in NSSI in the past year. An integrated latent structural equation model revealed that higher levels of perceived mother and father pressure were associated with a greater likelihood of past-year NSSI engagement in the university student sample. Among intrapersonal risk factors, only emotion dysregulation was found to be associated with higher NSSI likelihood and frequency. Building upon these results, Study 2 sought to narrow in further on understanding the emotion regulation profiles of university students with a past-year history of NSSI. Using a person-centered statistical approach, university students who reported having engaged in NSSI within the past year (n = 479; 83.8% female; Mage = 18.77; SDage = 1.43) were classified into latent profiles based on their self-perceived difficulties in regulating both positive and negative emotions. Independent samples of students who had a past history of NSSI but had not self-injured within the previous year (n = 439; 82.9% females; Mage = 19.03, SDage = 1.62) and who had no history of NSSI (n = 1551; 69.9% females; Mage = 19.02, SDage = 1.55) were included as comparison groups. Latent cluster analyses uncovered three emotion regulation profiles within the NSSI sample - the Average Difficulties (47.4%), Dysregulated (33.0%), and Low Difficulties (19.6%) profiles - each of which differed meaningfully from both comparison samples on mean levels of emotion regulation difficulties. Students across the three profiles also differed in their self-reported experiences with parents, particularly with fathers (perceived pressure, antipathy, unresolved attachment, psychological control), and in the extent to which they felt alienated from parents. Lastly, students across profiles differed in the frequency, methods, functions, and addictive properties of their NSSI. Taken together, findings from the current dissertation expanded our awareness of vulnerability factors for NSSI that have historically been understudied (e.g., parental pressure, father-child relationships, dysregulated positive emotions), while also bringing into focus the notion that even well-established NSSI risk factors (emotion regulation difficulties) can manifest quite heterogeneously amongst university students with a history of self-injurious behavior.

Hostility is a multidimensional construct that has been extensively studied. It has been shown that hostility affects cognitive (Shimojima et al., 2003), behavioral (Prkachin & Silverman, 2002), visual (Herridge, Mollet, Harrison, & Shenal, in press), somatosensory (Herridge, Harrison, & Demaree, 1997a), auditory (Demaree & Harrison, 1997a), motor (Demaree et al., 2002) and pre-motor functioning (Williamson & Harrison, 2003). In order to extend and integrate the present literature on hostility and the effects of negative emotional state on cognition, the present investigation used a cold pressor to induce a negative emotional/pain state in high and low hostile participants and measured. The subsequent effects on the acquisition of the Auditory Affective Verbal Learning Test (AAVLT; Snyder & Harrison, 1997) were measured. Blood pressure (BP) readings were taken before and after the cold pressor to examine cardiovascular regulation in high and low hostiles. Further, before the first trial participants were asked to predict the number of words that they would be able to recall on the first trial. After completion of the experiment participants were asked to estimate their performance relative to other participants. The measures were used to assess self-awareness in high and low hostile participants, which may be impaired in high hostile individuals (Demaree & Harrison, 1997b). As expected, high hostiles learned negative emotional words significantly better than they learned positive words. Additionally, high hostiles were impaired in their acquisition of verbal material relative to low hostile participants. Low hostile participants learned more words faster and reached asymptote sooner. A significant primacy effect for negative emotional words and an overall better recall of negative information was found. Analysis on each of the four groups of the experiment indicated that participants in the cold pressor group performed similar to the high hostile participants. The cold pressor facilitated negative learning and also slowed verbal learning relative to the no cold pressor group. It was predicted that high and low hostiles would differ on baseline measures of systolic blood pressure (SBP), diastolic blood pressure (DBP), and heart rate (HR) and that they would demonstrate increased cardiovascular reactivity in response to the cold pressor. These hypotheses were not supported. Self-awareness measures also failed to produce significance. These results support the proposal that high hostiles differ from low hostiles in a number of modalities. They demonstrate the persistence of negative emotional material. Future work should address what kinds of implications these factors have on high hostiles in daily interactions / Master of Science