Estudos comparando temperamento, caráter e impulsividade entre portadores de transtorno afetivo bipolar eutímicos e controles saudáveis têm mostrado escores mais elevados de busca de novidade, esquiva ao dano, autotranscendência e impulsividade, e escores mais baixos de autodirecionamento e cooperatividade entre os portadores de transtorno bipolar. Entretanto, não está claro se esses achados são resultado de um efeito cicatriz dos episódios ou representam marcadores de vulnerabilidade ao transtorno. O objetivo deste estudo foi avaliar traços de personalidade como prováveis marcadores de vulnerabilidade ao transtorno afetivo bipolar por meio da comparação de escores de temperamento, caráter e impulsividade entre portadores de transtorno afetivo bipolar, seus irmãos sem este transtorno e controles saudáveis. Foram avaliados 67 portadores eutímicos de transtorno afetivo bipolar tipo I, 67 irmãos e 70 controles saudáveis utilizando-se o Inventário de Temperamento e Caráter e a Escala de Impulsividade de Barratt. Foram considerados eutímicos os portadores de transtorno afetivo bipolar que apresentavam escores 7 na Escala de Avaliação de Depressão de Hamilton e na Escala de Avaliação de Mania de Young. As comparações das médias dos escores de impulsividade e das dimensões de temperamento e caráter entre os três grupos foram realizadas por meio de análise de variância. Testes post-hoc de Games-Howell ou Tukey (em função da homogeneidade de variância das variáveis dependentes) foram utilizados para análises posteriores par a par. O nível de significância alfa foi estabelecido em 5%. O resultados mostraram que portadores de transtorno afetivo bipolar eutímicos apresentaram, em relação aos controles saudáveis, escores significativamente mais elevados de busca de novidade, esquiva ao dano e autotranscendência, bem como de impulsividade motora, atencional e de não planejamento, e escores significativamente mais baixos de autodirecionamento e cooperatividade. Os irmãos não afetados por transtorno afetivo bipolar apresentaram, em relação aos controles saudáveis, escores significativamente mais elevados de esquiva ao dano e impulsividade motora, e escores significativamente mais baixos de autodirecionamento. O subgrupo de 32 irmãos sem qualquer diagnóstico psiquiátrico apresentou escores significativamente mais baixos de esquiva ao dano em relação aos controles. Esses resultados sugerem que escores elevados de esquiva ao dano e impulsividade motora e escores baixos de autodirecionamento podem representar marcadores de vulnerabilidade ao transtorno afetivo bipolar, sendo que a dimensão esquiva ao dano destaca-se por ter permanecido elevada mesmo entre os irmãos sem qualquer transtorno psiquiátrico. Esses dados podem contribuir para o avanço no conhecimento sobre os mecanismos neurobiológicos subjacentes ao transtorno afetivo bipolar, bem como para o desenvolvimento de estratégias de tratamento e prevenção desse transtorno / Recent studies have shown that euthymic patients with bipolar disorder present higher scores on impulsivity, novelty seeking, harm avoidance and selftranscendence and lower scores on self-directedness and cooperativeness than healthy controls. However it is unclear whether specific personality traits are vulnerability markers for bipolar disorder or represent a scarring effect of the affective episodes. The aim of this study was to compare temperament, character and impulsivity among patients with bipolar disorder, their unaffected siblings and healthy controls. We assessed 67 euthymic outpatients with bipolar disorder type I, 67 full siblings and 70 healthy controls using the Temperament and Character Inventory and the Barratt Impulsiveness Scale. Patients were euthymic if they present a Hamilton depression rating scale score and a Young mania rating scale score less than 8. Analysis of variance was used to compare mean scores of temperament, character and impulsivity among the three groups, and the Games- Howell test and the Tukey test were used as post-hoc tests for pairwise comparisons. The level of significance was set at 5%. Euthymic patients with bipolar disorder showed higher scores on impulsivity, novelty seeking, harm avoidance, and selftranscendence, and lower scores on self-directedness and cooperativeness than healthy controls. Their siblings without bipolar disorder diagnosis showed higher scores on harm avoidance and motor impulsivity and lower scores on selfdirectedness than healthy controls. A subset of 32 siblings who never have developed any psychiatric disorder during lifetime showed higher harm avoidance scores than healthy controls. Our results suggest that higher scores on harm avoidance and motor impulsivity, and lower scores no self-directedness may represent vulnerability markers for bipolar disorder. The harm avoidance dimension stands out since it remained higher even among siblings without any axis I psychiatric diagnosis. These data may contribute to further improve preventive strategies in subjects at high risk for bipolar disorder

Purpose: The systematic review summarised the research investigating potential risk factors for impulsive behaviours in forensic populations. The empirical study examined the predictive utility of clinician rated, self-report and behavioural measures of impulsivity in detecting violence and antisocial behaviour in forensic mental health inpatient settings. Method: The review is comprised of 9 studies identified through electronic database searches using a structured search strategy and predetermined inclusion criteria. The empirical study employed a cross-sectional design using retrospective and prospective statistical analysis. Forty-three participants were recruited from secure forensic mental health inpatient settings across Scotland and data collected from clinician rated, self-report and behavioural measures of impulsivity. Results: The review found original evidence to suggest that traumatic brain injury, substance and alcohol misuse, trauma and sleep as possible predictors of impulsive behaviour in forensic populations. The empirical study found a relatively consistent relationship between impulsive behaviour and violent or antisocial behaviour in a sample of forensic mental health inpatients. Conclusions: The systematic review identified a limited number of risk factors thought to influence impulsive behaviour in forensic populations. The review highlights the need for future research with improved methodological design to further explore contributory factors for increased levels of impulsivity. Findings from the empirical study reveal clinician rating of impulsive behaviour to be the most sensitive in predicting future incidents of violent and antisocial behaviour, which may be supplemented by the addition of a self-report measure.

O objetivo deste trabalho é investigar propriedades qualitativas de certas equações diferenciais funcionais retardadas de segunda ordem quando lhes são impostos controles de impulsos adequados. Os principais resultados dizem respeito a estabilidade e oscilação por impulsos. Mais especificamente, consideramos algumas equações e provamos que suas soluções triviais podem ser estabilizadas por impulsos. Em seguida, consideramos uma destas equações e provamos que suas soluções podem se tornar oscilatórias com a imposição apropriada de controles de impulsos. Apresentamos alguns exemplos que ilustram nossos resultados. Além do objetivo acima, procuramos produzir um texto que compreendesse a teoria fundamental das equações diferenciais funcionais retardadas impulsivas, teoria esta que, até então, não podia ser encontrada num único texto como este. Desenvolvemos e discutimos existência, unicidade, continuação de soluções, intervalo maximal de existência e dependência contínua de soluções dos valores iniciais para equações diferenciais retardadas impulsivas. / The purpose of this work is to investigate qualitative properties of certain second order delay differential equations when some proper impulse controls are added to them. The main results concern the stability and scillation by impulses. More specifically, we consider some equations and prove that their trivial solutions can be stabilized by impulses. We also consider one of these equations and prove that all solutions oscillate when proper impulse controls are imposed. We give some examples to illustrate our results. Because dealing with systems with both delays and impulses is a recent interest of some mathematicians we also considered producing a text that would encompass the fundamental theory of retarded functional differential equations with impulses. Up to now such theory could not be found in a single text as this one. Therefore we discuss and develop basic aspects of the theory as existence, uniqueness, continuability of solutions, maximal interval of existence and continuous dependence of solutions on initial values for impulsive retarded differential equations.

Preference for smaller-sooner over larger-later rewards characterizes one type of impulsivity—impulsive choice. Impulsive choice is related to a number of maladaptive behaviors including substance abuse, pathological gambling, and poor health behaviors. As such, interventions designed to reduce impulsive choice may have therapeutic benefits. The purpose of this dissertation was to explore two methods to change nonhuman impulsive choice. In doing so, we hope to provide a baseline that future research can use to assess variables that are less amenable to human research (e.g., drug self-administration following reductions in impulsive choice). In Chapter 2, we failed to reduce nonhuman impulsive choice using working-memory training, a finding both inconsistent and consistent with the extant human literature. Chapters 3-5 sought to better understand a training regimen that generates large between-group differences in nonhuman impulsive choice—delay- and immediacy-exposure training. The results from Chapters 3 and 4 suggest that prolonged exposure to delayed food rewards produces large and long-lasting reductions in impulsive choice. Chapter 5 showed that the delay-exposure training effect can be obtained in fewer sessions than has previously been employed. A better understanding of the effects of delay-exposure training on nonhuman impulsive choice may have implications for the design and implementation of a human analog.

Impulsivity takes many forms, one of which is termed impulsive choice. Impulsive choice entails preference for an outcome due to its immediacy relative to more optimal outcomes that take longer to come to fruition. For example, one may wish to have another serving of a decadent dessert after dinner—but doing so may undermine a longer-term goal of improved health and nutrition. If having the extra serving becomes a habit, the consequences of that choice compound and may lead to, for example, obesity. A high degree of impulsive choice such as this is indeed related to issues such as obesity, drug addictions (e.g., alcohol, opiates), and more; it may also cause these conditions. Because impulsive choice may lead to the development of poor health conditions, being able to reduce impulsive choice may reduce the occurrence of these conditions and/or help treat them. To date, a variety of studies have been conducted to examine ways to reduce impulsive choice, but it was unclear what methods may be most useful for clinical use in humans. Thus, the first portion of the enclosed research was a literature review in which successful methods for reducing impulsive choice were identified. A particular intervention called Episodic Future Thinking (EFT), which entails vivid imagination of one’s future, was one of the most promising found. However, it was unclear if its positive effects on impulsive choice were due to EFT itself or a placebo-like effect, which can arise from being able to guess the purpose of the intervention. The remaining portions of this dissertation focused on determining whether people are able to identify the purpose of EFT, and subsequently, if this awareness accounts for the positive effects of EFT on impulsive choice. Across three experiments, we demonstrated that naïve individuals are able to figure out the purpose of EFT (Experiments 1a and 1b), but that being aware of its purpose is unrelated to its positive effects (Experiment 3). These findings give hope that this intervention could be clinically useful, but it did appear that its benefits did not generalize well to novel settings (Experiment 2). Overall, the results of the research showed that EFT produces genuine changes in impulsive choice, but that further research will need to be conducted to understand why it works, and ultimately, how its generalizability can be increased.

A language comprehension mechanism that immediately starts processing language as it is encountered is typically thought of as one that speeds and facilitates spoken language comprehension. However, there exist cases where the earliest parts of a word or phrase encode information that is somewhat at odds with the remainder of the word or phrase in full. Examples of these "potentially misleading" cases include compound words where the initial subpart of the compound belongs to a different syntactic category than the entire compound (e.g., "popcorn", "greyhound"), or noun phrases where the initial element of the phrase signals perceptual properties possessed by the referent of the noun phrase (e.g., some Chinese Cantonese classifier-noun phrases). Using a visual-world methodology, this dissertation explores the kinds of unintended or "impulsive" activation that are triggered when listeners encounter such cases, as well as how syntactic and contextual cues can constraining this impulsive activation. Experiment 1 examines whether hearing compound subparts (e.g., "pop-" in "popcorn") activates conceptual associates across syntactic categories, and Experiment 2 examines whether this activation is moderated by listeners' expectations about the syntactic structure of the sentences they encounter. Experiments 3 and 4 investigate the processing of compounds whose initial subparts correspond to colour terms (e.g., "greyhound"). Experiment 3 explores whether these colour subparts trigger the activation of phrasal-level descriptions of non-target objects in the visual display, and whether this activation is influenced by the presence/absence of motivation to use colour descriptions when naming screen objects. Experiment 4 further explores whether a perceptual mismatch between a target object and the colour term in its name increases this impulsive activation. Finally, Experiment 5 investigates whether listeners use the perceptual information encoded in pre-nominal classifiers in Cantonese Chinese to guide their consideration of referential candidates whose perceptual properties do or do not match the classifier semantics. The findings from this dissertation point to the highly interactive nature of spoken language comprehension, suggesting that the kinds of impulsive activation under current discussion are rampant and automatic, but can also be suppressed to varying degrees by the syntactic, semantic, and contextual cues available to the listener.

Although there already exists a rich literature on cooperative diversity, current results are mainly restricted to the conventional assumption of additive white Gaussian noise (AWGN). AWGN model realistically represents the thermal noise at the receiver, but ignores the impulsive nature of atmospheric noise, electromagnetic interference, or man-made noise which might be dominant in many practical applications. In this thesis, we investigate the performance of cooperative communication over Rayleigh fading channels in the presence of impulsive noise modeled by Middleton Class A noise. We consider a multi-relay network with amplify-and-forward relaying and orthogonal cooperation protocol. As for the coding across the relays, we employ either space-time coding or repetition coding. For each scheme, we assume various scenarios based on relays’ location and quantify the diversity advantages through the derivation of the pairwise error probability. Based on the minimization of a union bound on the error rate performance, we further propose optimal power allocation schemes and demonstrate significant performance gains over their counterparts with equal power allocation. We finally present an extensive Monte Carlo simulation to confirm our analytical results and corroborate on our results.

Although there already exists a rich literature on cooperative diversity, current results are mainly restricted to the conventional assumption of additive white Gaussian noise (AWGN). AWGN model realistically represents the thermal noise at the receiver, but ignores the impulsive nature of atmospheric noise, electromagnetic interference, or man-made noise which might be dominant in many practical applications. In this thesis, we investigate the performance of cooperative communication over Rayleigh fading channels in the presence of impulsive noise modeled by Middleton Class A noise. We consider a multi-relay network with amplify-and-forward relaying and orthogonal cooperation protocol. As for the coding across the relays, we employ either space-time coding or repetition coding. For each scheme, we assume various scenarios based on relays’ location and quantify the diversity advantages through the derivation of the pairwise error probability. Based on the minimization of a union bound on the error rate performance, we further propose optimal power allocation schemes and demonstrate significant performance gains over their counterparts with equal power allocation. We finally present an extensive Monte Carlo simulation to confirm our analytical results and corroborate on our results.

In this thesis, we discuss models for multi-agent dynamical systems. We study the tracking/migration problem for flocks and a theoretical framework for design and analysis of flocking algorithm is presented. The interactions between agents in the systems are denoted by potential functions that act as distance functions, hence, the design of proper potential functions are crucial in modelling and analyzing the flocking problem for multi-agent dynamical systems. Constructions for both non-smooth potential functions and smooth potential functions with finite cut-off are investigated in detail. The main contributions of this thesis are to extend the literature of continuous flocking models with impulsive control and delay. Lyapunov function techniques and techniques for stability of continuous and impulsive switching system are used, we study the asymptotic stability of the equilibrium of our models with impulsive control and discovery that by applying impulsive control to Olfati-Saber's continuous model, we can remove the damping term and improve the performance by avoiding the deficiency caused by time delay in velocity sensing. Additionally, we discuss both free-flocking and constrained-flocking algorithm for multi-agent dynamical system, we extend literature results by applying velocity feedbacks which are given by the dynamical obstacles in the environment to our impulsive control and successfully lead to flocking with obstacle avoidance capability in a more energy-efficient way. Simulations are given to support our results, some conclusions are made and future directions are given.

With the change of world economy and the constant innovation of technology, people¡¦s lifestyle and eating habits have changed tremendously. And There are more and more people like to eat out. When they are choosing restaurants, the western-style fastfood will be often taken into account. In fact, eating too much fast food in high calories will cause nutrition disorders and fatness. So consumer should keep careful attitude toward this kind of food. In Taiwan, every western-style fastfood corporation is in high competition. In order to increase sales and market share, firms adopt different marketing strategies to attract consumers. When new products are launched, the point of purchase advertising will be replaced right away to convey product information to customers. Therefore, the research chooses McDonald¡¦ s, Mos Burger and Burger King because they are top corporations. The main purposes as follows: 1. Among McDonald¡¦ s, Mos Burger and Burger King¡¦s point of purchase advertising, to explore the relevance between impulsive buying behavior and point of purchase advertising. 2. To research the revision effect of impulse buying characteristics and demographics. This research analysis consumers¡¦ behaviors after seeing point of purchase advertising in Mcdonald, Mos Burger, and Burger King. After analyzing, we found that consumers in Mcdonald, Mos Burger and Burger King has lower ratio of impulsive buying behavior. Thus, point of purchase and impulsive buying behavior are low connected. About revision effect of impulsive buying characteristics, only Mos Burger has revision effect. About demographic variables, age, educational level and monthly income don¡¦t have revision effect in three research objects. And about sex, only Mos Burger has revision effect.