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People turn to others for help and advice during hard times. Early psychologists suggested a ‘talking cure’ as a remedy for emotional turmoil (e.g., Freud, 1916–7/1963; Rogers, 1942). Likewise, folk psychology often sees heart-to-heart conversations as a win-win proposition that brings relief to the afflicted person and reinforces social bonds at the time of need. However, talking about problems does not always help (e.g., Rimé, 2009; Rimé, Mesquita, Boca, & Philppot, 1991; Rimé, Philippot, Boca, & Mesquita, 1992; Rose, 2002). In some cases, problem-talk can be a lose-lose proposition that drags both discussants into depression (Rose, 2002; Rose, Carlson, & Waller, 2007). This thesis examines co-rumination (Rose, 2002), a case of emotional sharing that hurts people instead of helping them, on three levels of analysis (individuals, dyads, and groups). At the individual level, I sketch the life course of co-rumination and replicate earlier findings of gender differences. Furthermore, online survey data (N = 464) links co-rumination with agreeableness and neuroticism. I also demonstrate that co-rumination can be assessed with a brief measure that is 66% shorter than the original. At the dyadic level, data from recorded conversations between romantic couples show that face-to-face co-rumination influences people’s real-time emotional trajectories in complex ways. Furthermore, observer-ratings of the conversations suggest that third-parties can detect co-rumination, even from silent videos. Finally, I study how people react to others’ negative mood and co-rumination in a real social context by longitudinally following two cohorts of students and modelling their interactions with social network analysis tools. These models show that co-rumination appears to elicit social rejection from others, implying a possible pathway to depression via loneliness imposed on the co-ruminators.

The social cognitive theory of Depression proposed by Rothbaum et al. (2008) integrates theory originating from the motivation, cognitive and rumination literature. Following stressors, those with vulnerable self-beliefs are predicted to adopt performance goals that aim to avoid threats to self-worth, necessitating protective mechanisms like rumination. Both the goals themselves and rumination serve to protect self-worth but are proposed to have depressogenic consequences. This theory, combined with literature on contingent self-worth and trait rumination in depression, led to an elaborated social cognitive model whereby rumination mediates the relationship between goal orientation and depression. The current study aimed to test this model. Seventy two healthy participants participated in an experimental manipulation of goal orientation prior to a difficult anagram task and rated their sadness, anxiety, and state rumination following a stressor and during a subsequent sustained attention task. The results suggested many of the hypotheses about condition differences were not supported and this may have been due to an unsuccessful task goal manipulation. However extrinsic contingent self-worth based on other’s approval was found to moderate the effect of goal orientation on task based depressive affect and rumination. For those reporting high contingent self-worth based on other’s approval, cuing a performance goal was related to significantly higher sadness and rumination following a stressor than cuing mastery goal. Findings suggest that therapy specifically focusing on assessing extrinsic contingent self-worth and associated vulnerable self-beliefs, and encouraging the adoption of mastery goals may be therapeutically beneficial in making people less reactive to stressful life events.

Literature Review: Anhedonia, the loss of interest or pleasure in usually pleasurable activities, is a core symptom of depression and is associated with a reduction in positive affect (PA). Repetitive negative thought (RNT) is implicated in the development and maintenance of psychiatric disorders. It has been hypothesised that RNT causally contributes to anhedonia. The aim of this review was to explore this relationship to answer two questions: Is there a relationship between RNT and anhedonia? Does RNT causally contribute to anhedonia? Review inclusion criteria were: studies using standardised measures to report a relationship between RNT and anhedonia or reduced PA. Results suggest that cross-sectional and longitudinal studies identify a relationship between RNT and anhedonia. Preliminary evidence from experimental studies shows that RNT causally contributes to anhedonia. Limitations within the field are that anhedonia is rarely measured directly or behaviourally. Future research is warranted to explore the relationship between RNT and anhedonia with a particular focus on direct and behavioural measures of anhedonia. Empirical Paper: It is hypothesised that repetitive negative thought (RNT) causally contributes to anhedonia. There is cross-sectional and longitudinal evidence of this relationship, but it has not previously been investigated directly using experimental methods. In the present study, student participants were randomly assigned to an unresolved goal (RNT) manipulation (n = 43) or resolved goal (control) manipulation (n =41) prior to completing a reward sensitivity task. This task has been reliably found to train a response bias towards the stimuli that is differentially positively reinforced, with both depression and self-reported anhedonia associated with a reduced response bias. The unresolved goal versus resolved goal manipulation was effective, with the unresolved condition producing significantly higher levels of RNT during the reward sensitivity task relative to the resolved condition. Inconsistent with study predictions, there was no significant difference between the conditions on response bias, although there were trend findings, which tentatively suggest that RNT may influence anhedonia. Potential accounts for the null findings and future research are discussed.

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Background: The present study considers some of the underlying mechanisms that may be acting in postnatal depression (PND). It has been suggested that rumination predicts problem solving ability and that child temperament and maternal attributions predict mother-infant bonding. This study aims to investigate the role that brooding and reflective rumination may play in predicting and mediating these relationships in postnatal women. Methods: Postnatal women were recruited to complete an online survey.190 women responded and completed the Edinburgh Postnatal Depression Scale (EPDS), Maternal Attribution Scale (MAS), Postpartum Bonding Questionnaire (PBQ), Parental Problem Solving Task (PPST), Rumination Response Scale (RRS), Infant Behaviour Questionnaire (IBQ) and a confidence in problem solving using a Visual Analogue Scale (VAS). Results: Analyses showed that reflective rumination mediated the relationship between low infant soothability and high negative attributions, on maternal problem solving. Reflective and Brooding Rumination also predicted confidence in problem solving and mother-infant bonding. Analyses showed that infant temperament (soothability and distress) and maternal attributions (positive and negative) predicted confidence in problem solving and mother-infant bonding Limitations: This study employed a correlational design and therefore all inferences regarding possible causal pathways are tentative. Limitations include the use of self report measures to assess mother-infant bonding and infant temperament. Additionally the PPST is a new measure which needs further validation. Conclusions: Reflective rumination may act as an adaptive strategy for women in the postnatal period when faced with difficult child temperaments, and for those employing negative attributions, when faced with parent specific problem solving tasks. In addition, Brooding and Reflective Rumination may be important in predicting difficulties in mother-infant bonding. Difficult Infant temperaments and less positive or more negative maternal attributions, may affect problem solving, confidence in problem solving and mother-infant bonding in the postnatal period. Future research should look to replicate these findings and explicate possible causal relationships within a postnatal population.

The thesis aim was to increase understanding of interpersonal antecedents and consequences of rumination, defined as ‘repetitive and passive thinking about one’s symptoms of depression and the possible causes and consequences of those symptoms’ (Nolen-Hoeksema, 2004, p.107). As a proof-of-principle study, rumination predicted diminished relationship satisfaction, three months later, in a sample of remitted depressed adults (N = 57). In the next study, rumination was associated with a maladaptive submissive interpersonal style and rejection sensitivity, controlling for depressive symptoms, other interpersonal styles and gender, in a different sample (N = 103 currently depressed, previously depressed and never depressed adults). Subsequent chapters incorporated a second assessment point of data from this same sample. Longitudinal analyses were undertaken to investigate; a) do rumination and depressogenic interpersonal factors predict future depression?; b) does rumination prospectively predict increased rejection sensitivity and submissive interpersonal behaviours, and, vice-versa, do these interpersonal factors predict increased rumination?; c) does rumination prospectively predict poor social adjustment and interpersonal stress? Consistent with previous findings, Time 1 rumination predicted increased depression six months later. Unexpectedly, the effect of rumination on future depression was mediated by its relationship with the submissive interpersonal style. Partially consistent with the stated predictions, Time 1 rejection sensitivity (but not the submissive interpersonal style) prospectively predicted increased rumination, but rumination did not predict rejection sensitivity or the submissive interpersonal style. As predicted, rumination prospectively predicted increased chronic interpersonal stress and poor social adjustment (but not acute interpersonal stress). In a final study, rumination was manipulated via an applied intervention (concreteness training, CT), within the context of a randomized controlled trial (N = 79 clinically depressed adults). Analyses compared the change in social adjustment and submissive interpersonal behaviour reported in the CT condition compared to a treatment as usual (TAU) condition. There was a significantly greater reduction in rumination in the CT compared to TAU condition, p < .05. Moreover, the reduction in submissive interpersonal behaviours was significantly greater in the CT compared to TAU condition, p < .05. The change in social adjustment was not greater in the CT compared to TAU condition. Thus, a psychological intervention which reduces rumination decreased maladaptive submissive interpersonal behaviour. The implications of the findings are discussed in relation to theory of rumination and interpersonal theories of depression.

Research indicates that women are more likely to experience depression than are men. The current study examined the effects of gender, socialized gender roles, rumination, and neuroticism on symptoms of depression in young adults. As predicted, rumination mediated the relationship between gender and depression, and socialized gender roles had a greater explanatory power for rumination, neuroticism, and depression than did gender. Contrary to predictions, rumination did not mediate neuroticism's effects on depression. Structural equation modeling reveled that rumination-on-sadness positively predicted neuroticism and depression. However, rumination-in-general, while positively predicting neuroticism, negatively predicted symptoms of depression. Finally, once socialized gender roles, rumination, and neuroticism were controlled, male gender was modestly predictive of depression.

This thesis reports five studies investigating cognitive processes in eating disorder (ED) psychopathology. Chapter 1 describes background information about EDs. Chapter 2 reviews cognitive theories of Anorexia Nervosa (AN), and discusses how integration of a process-focused framework, originally applied to depression, may advance under-standing of maintaining mechanisms in AN. Chapter 3 reports a focus group with AN patients that explores features of the subjective experience of the disorder. Findings highlight ruminative, avoidant and discrepancy-based thinking: features that are suggested to be indicative of a ‘conceptualising’ mode of processing. Patients’ reports suggest positive effects of a body-mindfulness group, which encourages an alternative, ‘experiential’ mode of processing. Chapter 4 presents data on rumination, experiential avoidance, negative self-beliefs and underlying assumptions in an analogue population and shows elevated levels for ED-concerned individuals on all of these measures. Chapter 5 examines mode of processing effects (conceptual vs. experiential) in an analogue population. Findings show differential stress-induced emotional reactivity, particularly in the ED-concerned group. Chapter 6 investigates mode of processing effects in a sample of AN patients. Results confirm that modes of processing have differential effects on stress-induced emotional reactivity. Chapter 7 presents data from a 10-month follow-up of AN patients. This study shows that changes in ED-symptoms are associated with changes in rumination, avoidance and aspects of schematic thinking. Differential stress-induced reactivity is associated with outcome. Finally, chapter 8 discusses theoretical and clinical implications of this research and the mode of processing framework in EDs, particularly AN, as well describing how future investigations may continue integrating this framework to the study of ED psycho-pathology. The current findings suggest that both cognitive-affective content and the underlying mental processing activity need consideration in cognitive models of EDs.

Orientador: Francisco Stefano Wechsler / Banca: André Mendes Jorge / Banca: Ciniro Costa / Banca: Deiler S. Costa / Banca: Valter J. Onsellen / Resumo: O objetivo desta pesquisa foi avaliar a influência do grupo genético do bezerro no comportamento de mães e suas crias. Usaram-se 24 vacas Nelore paridas e seus bezerros, dos quais oito eram Nelores, oito ½Simental ½Nelore, e oito ½Red Angus ½Nelore. Avaliaram-se as medidas de freqüência e duração das mamadas, tempo de pastejo e ruminação dos bezerros e vacas. Os bezerros puros mamaram mais freqüentemente que os mestiços (3,51 vs. 3,17 vezes/dia), porém com menor duração de mamada (7,37 vs 7,80 minutos). A freqüência de mamadas, duração de cada mamada e tempo total de mamadas diminuíram com o aumento na idade do bezerro. Nos bezerros, pastejo e ruminação aumentaram com a idade; porém, nas vacas, aumentou o tempo de pastejo e diminuiu o de ruminação com o passar dos dias. Os bezerros mestiços pastaram, em média, 18 minutos a mais que os puros, e os machos, 16 minutos a mais que as fêmeas. Os bezerros machos ruminaram, aos 40 dias de idade, 25 minutos a mais que as fêmeas, mas esta diferença diminuiu com a idade e desapareceu por volta dos 220 dias. As mães de mestiços ruminaram, em média, 10 minutos a mais que as mães dos puros. O comportamento da mãe e de sua cria é influenciado pelo grupo genético desta última. / Abstract: The objective was to evaluate the effect of a calf's genetic group on the behavior of dam and calf. We used 24 Nellore dams and their calves, of which eight were Nellore, eight were ½Simmental ½Nelore and eight ½Red Angus ½Nellore. Grazing and rumination times, as well as suckling frequency and time, were measured. The straightbred calves suckled more often than the crossbreds (3.51 vs. 3.17 times/day), but their suckling lasted less time (7.37 vs 7.80 minutes). Suckling frequency, suckling length and total time spent suckling decreased as calf age increased. Calf grazing and rumination time increased with age; however, the cows' grazing time increased and rumination time decreased as the days postpartum went by. The crossbred calves grazed, on the average, 18 minutes longer than the crossbreds, and the males grazed 16 minutes longer than the females. The male calves grazed, at 40 days of age, 25 minutes longer than the females, but this difference decreased as they grew up and disappeared around 220 days. The dams of crossbreds ruminated, on the average, 10 minutes longer than the dams of straightbreds. In conclusion, dam and calf behavior are influenced by the calf's genetic group. / Doutor