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<p>Social fears gain in prominence among higher primates, including humans, where threats associated with other conspecifics become more common. Social fearfulness is expressed on a continuum, ranging from shyness to a diagnosable psychiatric disorder. Despite the wide prevalence and considerable distress associated with social anxiety, our understanding of its neural and cognitive correlates remains in its infancy and remains an imperative for future translational research. The current dissertation examined social anxiety by utilizing multiple experimental approaches and employing a broad range of measures involving neural, cognitive, behavioural and clinical assessments.</p> <p>Chapters 2 to 4 relied on nonclinical samples of adults selected for social anxiety from a large adult population. Chapters 2 and 3 employed event-related brain potentials to index distinct aspects of perceptual and cognitive processing in tasks that manipulated novelty under socio-emotional and affectively neutral contexts. The aim was to provide a fine-grained characterization of the information processing stages that are biased by social anxiety. Chapter 4 measured reaction times in a selective attention task that independently varied the temporal and energetic aspects of affective stimulus delivery to provide convergent evidence into how affective processing is perturbed by social anxiety. Chapter 5 employed a novel method of quantifying continuous EEG to examine large-scale brain activity during rest and symptom provocation in patients diagnosed with social anxiety disorder. The aim was to examine, for the first time, whether there are treatment-related changes in a measure that putatively indexes communication across different (cortical and subcortical) neuronal systems.</p> <p>Findings suggest that social anxiety is associated with a sensitization of (bottom-up) systems reacting to social threat and that these biases appear during the early, relatively automatic stages of information processing. Some of these systems may be susceptible to evidence-based psychological treatments that are correlated with changes in brain activity detectable in EEG patterns. <br /><br /></p> / Doctor of Philosophy (PhD)

Asians consistently report higher social anxiety symptoms but have lower prevalence rates, compared to Westerners. As cultural differences and measurement issues could both be potential sources for the discrepancy, it is important to examine whether score differences between cultural groups are due to measurement issues or genuine underlying differences in social anxiety. This study used 402 participants to examine the construct of social anxiety and measurement invariance of six social anxiety scales using exploratory and confirmatory factor analysis. Results supported scalar invariance of a three-factor bifactor model (comprised of Fear/Avoidance of Social Interaction, Fear of Negative Evaluation, and Taijin Kyofusho/fear of interpersonal relationships). Furthermore, multivariate analysis of covariance and moderation analysis revealed Asian Americans endorsed higher Fear/Avoidance of Social Interaction symptoms, but do not differ in Taijin Kyofusho and Fear of Negative Evaluation symptoms, compared to European Americans. This study showed when measurement bias is minimized, Asians still endorse higher symptoms of Fear/Avoidance of Social Interactions. Moreover, Taijin Kyofusho appears to be an aspect of social anxiety identified in more than one cultural group rather than a culture-related specific syndrome. Thus, it is important for clinicians and researchers to consider Taijin Kyofusho in the evaluation of social anxiety. / School Psychology

Social anxiety and depression are commonly comorbid, and together they result in greater functional impairment and a poorer prognosis than when either condition occurs alone. Although the onset of social anxiety precedes the development of depression in the large majority of comorbid cases, little research has directly examined factors that contribute to the occurrence of depression in individuals with social anxiety. Theoretical models implicate emotion and emotion regulation in the development and maintenance of internalizing disorders. Emotion regulation research has predominantly focused on expressive suppression (ES), the suppression of outward emotion, and cognitive reappraisal (CR), the modification of cognitions to manage emotion. Social anxiety and depression are both characterized by maladaptive patterns of emotion regulation, exhibiting an overreliance on ES and an underutilization of CR. The present study investigated the role of emotion regulation, specifically ES and CR, in the relationship between social anxiety and depression over time. Our primary aim was to evaluate ES and CR, separately, as mediators of the relationship between social anxiety and depression. Our secondary aim was to evaluate additional mediating and/or moderating effects of related variables (i.e., relationship quality, positive and negative affect, and reward sensitivity). Our final exploratory aim was to evaluate whether emotion regulation (i.e., ES and CR) for positive emotions differs from emotion regulation for negative emotions in the relationships proposed by our primary and secondary aims. Undergraduate participants (N=137) completed an in-person laboratory session (i.e., baseline), followed by a 14-day daily diary period. During the daily diary period, participants reported on their daily experiences of social anxiety, depressed mood, emotion, emotion regulation, and relationship quality. Approximately two weeks after the end of the daily diary period (i.e., four weeks after baseline), participants completed a final in-person laboratory session (i.e., endpoint). Multilevel modeling was used to analyze observation-level data over the two-week diary period, and bootstrapping methods were used for person-level analyses over the full four-week study period. Daily diary analyses failed to support the hypothesized mediation models. Average social anxiety across the daily diary period was positively associated with daily depressed mood, but observation-level social anxiety was not. Exploratory analyses revealed affect-specific effects of emotion regulation, such that higher perceived success in ES (i.e., daily ES self-efficacy) for positive affect and less frequent use of CR (i.e., daily CR frequency) for negative affect significantly predicted higher next-day depressed mood. Person-level analyses across the four-week study period yielded some support for our hypotheses, in that ES frequency and positive affect acted as sequential mediators of the relationship between social anxiety and depression. Higher social anxiety predicted more frequent ES, which predicted lower positive affect, which then predicted higher depression. However, the mediation model was no longer significant after controlling for baseline depression. Our results highlight the role of emotion dysregulation in predicting depression and provide initial support for the mediating effects of ES and CR in the relationship between social anxiety and depression. These findings also emphasize the importance of investigating affect-specific effects, with particular attention paid to emotion regulation for positive affect and its role in the co-occurrence of social anxiety and depression. Future research would benefit from longitudinal studies across longer time periods and examining these relationships within a clinical sample. / Psychology

Social anxiety disorder (SAD) is one of the most prevalent psychological disorders and one that is particularly disruptive of social relationships. Socially anxious individuals often have trouble forming and maintaining intimate relationships, as evidenced by a high divorce rate and low relationship satisfaction within existing relationships. However, little is known about the specific reasons why relationships involving socially anxious individuals suffer. Initial research suggests that such relationships may be characterized by lower levels of emotional intimacy and difficulties managing and resolving conflict. The current study aimed to detect specific problems socially anxious individuals have communicating with their partners during conflict and support-seeking conversations. Male (n = 50) and female (n = 57) undergraduates ("actors") and their intimate partners ("partners") completed two videotaped conversations in our laboratory. One conversation featured a topic of conflict within the relationship, whereas the other focused on a personal problem experienced by the actor. Outcomes of interest included level of engagement and expressiveness of the actor, presence of positive (e.g., humor) and negative (e.g., withdrawal) communication behavior by the actor, feelings of satisfaction and closeness of both partners, and emotions experienced by both partners. We hypothesized that social anxiety would be associated with lower levels of engagement and expressiveness overall, but especially during conflict. Further, we hypothesized that those higher on social anxiety would demonstrate more negative communication behavior (such as expressing hostility toward their partners) during conflict. Results provided some evidence that socially anxious individuals were less engaged and expressive when speaking with their partners. However, there was no evidence that they used more negative communication behaviors. Our hypothesis that social anxiety would be associated with greater difficulty during conflict had minimal support; rather, conversations in which the actor elicited support appeared to be the most difficult for socially anxious individuals, particularly when emotional experience was considered. Clinical implications and ideas for further research are explored. / Psychology