The purpose of the present thesis was twofold. First, to study the role of emotional arousal in memory processes, and secondly, to relate this concept to empirical findings of amnesia. In both clinical and experimental settings it has been observed that remembering is impaired for events occurring prior to, and after a traumatic critical event. This memory impairment is also demonstrated for the traumatic event per se. In relation to these phenomena an interaction is commonly observed such that remembering of events aquired in a state of high emotionality, or arousal, is inferior to events aquired in neutral low arousal conditions at short test intervals, but superior at delayed test intervals. The general notion to be tested was how and to what extent these phenomena are mediated by an increase in emotional arousal. In order to test this hypothesis a series of experiments was designed so that retrograde and anterograde amnesia, and amnesia for the traumatic event, could be studied so as to evaluate the locus of the emotional arousal and amnesia effects with respect to encoding (attention), storage (consolidation), and retrieval (reconstruction). Emotional arousal was induced by sources associated with the to-be-remembered (TBR) material (traumatic pictures), and by sources not associated with the TBR-material (injections of adrenalin). Memory performance was measured by recall and recognition techniques. Amnesia was obtained only when the source of arousal was associated with the TBR-items. It was concluded that amnesia in connection to hightened emotional arousal depends on attention demanding characteristics of the traumatic event, rather than physiological properties of hightened arousal per se. An interaction between factors at encoding and retrieval was proposed as an explanation for the amnesia effects obtained. An interpretation in terms of consolidation has, throughout this thesis, been shown to be invalid in explaining the memory phenomena referred to. / digitalisering@umu.se

Novel sounds in the auditory oddball paradigm elicit a biphasic dilation of the pupil (PDR) and P3a as well as novelty P3 event-related potentials (ERPs). The biphasic PDR has been hypothesized to reflect the relaxation of the iris sphincter muscle due to parasympathetic inhibition and the constriction of the iris dilator muscle due to sympathetic activation. We measured the PDR and the P3 to neutral and to emotionally arousing negative novels in dark and moderate lighting conditions. By means of principal component analysis (PCA) of the PDR data we extracted two components: the early one was absent in darkness and, thus, presumably reflects parasympathetic inhibition, whereas the late component occurred in darkness and light and presumably reflects sympathetic activation. Importantly, only this sympathetic late component was enhanced for emotionally arousing (as compared to neutral) sounds supporting the hypothesis that emotional arousal specifically activates the sympathetic nervous system. In the ERPs we observed P3a and novelty P3 in response to novel sounds. Both components were enhanced for emotionally arousing (as compared to neutral) novels. Our results demonstrate that sympathetic and parasympathetic contributions to the PDR can be separated and link emotional arousal to sympathetic nervous system activation.

This study sought to explore whether PTSD symptoms in detained adolescents were differentially related to high and low patterns of emotional reactivity, as determined based on callous-unemotional (CU) traits and emotion dysregulation. Analyses revealed four distinct groups based on these criteria: a low/no trauma control group with few PTSD symptoms, and three groups whose PTSD symptoms were distinguished by symptoms of emotional numbing. The study sought to determine whether these profiles were related to distinct patterns of aggression and delinquency. Results revealed that the low/no PTSD symptom group exhibited the least aggression and delinquency. Further, results indicated that higher CU traits and violent offending are associated with a combined PTSD symptom profile. Results suggest a relationship between PTSD symptoms, delinquency, aggression, and CU traits. Findings provide support for the existence of a secondary variant of CU youth who are more emotionally dysregulated and prone to both arousal and emotional detachment.

Dėmesio mirksėjimo efektas – tai plačiai žinomas reiškinys dėmesio tyrimuose. Jis atspindi dėmesingo informacijos apdorojimo ribas, kadangi greitai (10 stimulų per sekundę dažniu) toje pačioje regos lauko vietoje pateikus stimulų seką dažniausiai žmonės nepastebi ir/ arba neatsimena antrojo reikšminio stimulo. Tai įvyksta tuo atveju, kai šis pasirodo 200-500 ms intervale nuo pirmojo reikšminio stimulo pateikimo. Neseniai Martens ir kolegos (2006) nustatė, jog kai kuriems žmonėms dėmesio mirksėjimo efektas nepasireiškia, jie buvo pavadinti „nemirksinčiais“. Manoma, kad individualius skirtumus lemia nevienodai efektyvus gebėjimas iš nereikšmingos informacijos srauto išsirinkti reikšmingą. Šiame darbe siekta patikrinti, ar individuali darbinės atminties talpa, tiriamojo emocinė būsena ir tiriamojo asmenybės bruožai turi įtakos dėmesio efekto išreikštumui. Naudojant parametrizuotą dėmesio mirksėjimo efekto analizės būdą, nustatyta, kad didesnė darbinės atminties talpa sąlygoja mažesnį dėmesio mirksėjimo efektą. Šie rezultatai patvirtina nuomonę, kad dėmesio mirksėjimo efektas yra darbinės atminties talpos ribotumo pasekmė. Taip pat nustatyta, kad tiriamojo emocinio sužadinamumo būsena yra susijusi su dėmesio mirksėjimo efekto stiprumu, o asmenybės bruožai – su trukme. / The attentional blink is a well-known phenomenon in the study of attention. It reflects the impaired ability to identify the second of two targets presented in a rapid serial visual presentation (RSVP) of events if it appears between 200 and 500 ms after the first target. Recently Martens et al. (2006) reported that about 5% of the population (referred to as “non-blinkers”) shows little or no attentional blink under conditions in which most people (“blinkers”) do show. It is proposed that aforementioned differences are determined by individual differences in efficiency of ignoring irrelevant information. Thus, the aims of this master’s thesis were to investigate the impact of working memory capacity, emotional state and personality traits on attentional blink effect. Using parameterized attentional blink analysis method, based on curve fitting, the negative correlation between the size of attentional blink and working memory capacity was revealed. These findings support the idea that individual processing limitations and working memory play a key role in attentional blink. Also it was demonstrated that emotional arousal has impact on the strength of attentional blink and personality traits have effect on the span of attentional blink.

No description available.

Background. The study was prompted by observation that failure to obtain a positive postsecondary destination is significantly more prevalent in young people living in areas of greater social deprivation, and in males rather than females. Previous studies have shown that this could be linked to differences in social cognitive factors. However, these studies have been mainly correlational and no comprehensive assessment instrument was found to assess preparedness for the postsecondary transition. Aims. The present study examines senior high school student’s perceptions of the personal, behavioural and environmental factors that affect them as they prepare to leave school. It reveals the structure of these factors and how they vary with regard to social deprivation and gender. Sample. The participants were 1044 senior high school students (573 males and 471 females) who attended six urban high schools. Method. A pre-empirical, 50-item assessment instrument was constructed based on the literature review to identify the wide range of factors previously shown to be relevant to achievement of a positive postsecondary destination. This was then administered to participants. Results. Factor analysis indicated that young people’s perceptions about leaving school were best represented by thirteen factors. An ANOVA model indicated that young people living in areas of higher deprivation reported significantly lower levels of positive postsecondary destination self-efficacy belief, less experience of vicarious career success, less performance of career development tasks, greater perception of career barriers, greater endorsement of a fixed career mindset, and fewer career scaffolding attachments. Males, compared to females, reported less experience of past career success, and fewer career scaffolding attachments. However, despite being at greater risk of a negative postsecondary destination, males reported higher levels of positive postsecondary destination self-efficacy belief, greater experience of positive career-related emotional arousal, greater ability to set career goals, and greater levels of career optimism. Conclusion. Twelve significant main effects on the measured social cognitive factors have the potential to contribute to an explanation of why failure to obtain a positive postsecondary destination is more prevalent in young people living in areas of greater social deprivation, and in males rather than females. A new assessment instrument has been produced to inform an ongoing exploratory process to design, target and evaluate educational interventions to improve postsecondary destinations for all. Increasing internal consistency, external validity and generalisability of findings are all desirable. Some future interventions are proposed on the basis of the results, including greater use of positive career role models in career development programmes, career mindset retraining for high school students, and psycho-education on attachment-fostering behaviours for parents and professionals.

本研究探討訓練情境中的情緒激發與知覺訓練難度對訓練成效之影響。本研究使用實驗法，採3（情緒激發：正向、負向、無激發）×2（知覺訓練難度：簡單與困難）完全受試者間設計，依變項為受訓者的自我效能、學習動機、訓練有用性與訓練學習結果。受試者為國立政治大學的127名大學生，受試者隨機分派到六種實驗情境之一，在實驗室中依序進行情緒激發作業、訓練作業，最後填寫研究問卷。本研究以變異數分析（ANOVA）與共變數分析（ANCOVA）（控制性別之影響）來檢驗情緒激發與知覺訓練難度對各依變項之影響。研究結果顯示情緒激發與知覺訓練難度之交互作用會影響受訓者的自我效能與學習動機。最後，本研究針對研究結果進行討論、並對研究限制、未來研究方向、理論與實務意涵加以闡述。 / This study focuses on the effect of emotional arousal and perceived training difficulty on training outcomes. A 3 (emotional arousal: positive, negative, control) x 2 (perceived training difficulty: easy, difficult) between-subject experimental design is used. The dependent variables are trainees’ self-efficacy, motivation to learn, utility judgment and learning outcome. Subjects (N=127) were randomly assigned to one of the six experimental situations and completed the emotional arousal task, training task, and research questionnaire in order. The researcher uses ANOVA and ANCOVA (controlling the gender effect) to examine the influence of emotional arousal and perceived training difficulty on each dependent variable separately. The results of the present study indicate that trainees’ self-efficacy and motivation to learn can be influenced by the interaction of emotion arousal and perceived training difficulty. At last, the results, limitation, further research directions and implications are discussed.