Calibration, information, and control strategies for braking to avoid a collision

This study explored visual control strategies for braking to avoid collision by manipulating information about speed of self-motion. Participants watched computer-generated displays and used a brake to stop at an object in the path of motion. Global optic flow rate and edge rate were manipulated by adjusting eye-height and ground-texture size. Stopping distance, initiation of braking, and the magnitude of brake adjustments were influenced by both optical variables, but global optic flow rate had a stronger effect. A new model is introduced according to which braking is controlled by keeping the perceived ideal deceleration, based in part on global optic flow rate, within a "safe" region between 0 and the maximum deceleration of the brake.     

Cognitions and behavior in asymmetric social dilemmas: a comparison of two cultures

This study investigated whether cognitions and behavior in an asymmetric social dilemma can be predicted by national culture. Results indicated that, as predicted, groups of decision makers from Japan--a collectivist, hierarchical culture-were more cooperative, expected others to be more cooperative, and were more likely to adopt an equal allocation distribution rule to resolve the dilemma than were groups of decision makers from the United States-an individualist, egalitarian culture. An opportunity for communication had a greater impact on expectations of others' behavior in groups of U.S. decision makers than in groups of Japanese decision makers.     

Perceiving curvilinear heading in the presence of moving objects

Four experiments were directed at understanding the influence of multiple moving objects on curvilinear (i.e., circular and elliptical) heading perception. Displays simulated observer movement over a ground plane in the presence of moving objects depicted as transparent, opaque, or black cubes. Objects either moved parallel to or intersected the observer's path and either retreated from or approached the moving observer. Heading judgments were accurate and consistent across all conditions. The significance of these results for computational models of heading perception and for information in the global optic flow field about observer and object motion is discussed.     

Reliability of DSM-IV anxiety and mood disorders: implications for the classification of emotional disorders

The reliability of current and lifetime Diagnostic and Statistical Manual of Mental Disorders (4th ed.; DSM-IV; American Psychiatric Association, 1994) anxiety and mood disorders was examined in 362 outpatients who underwent 2 independent administrations of the Anxiety Disorders Interview Schedule for DSM-IV: Lifetime version (ADIS-IV-L). Good to excellent reliability was obtained for the majority of DSM-IV categories. For many disorders, a common source of unreliability was disagreements on whether constituent symptoms were sufficient in number, severity, or duration to meet. DSM-IV diagnostic criteria. These analyses also highlighted potential boundary problems for some disorders (e.g., generalized anxiety disorder and major depressive disorder). Analyses of ADIS-IV-L clinical ratings (0-8 scales) indicated favorable interrater agreement for the dimensional features of DSM-IV anxiety and mood disorders. The findings are discussed in regard to their implications for the classification of emotional disorders.     

Directed Convergence in Stable Percept Acquisition

We view a perceptual capacity as a nondeductive inference, represented as a function from a set of premises to a set of conclusions. The application of the function to a single premise to produce a single conclusion is called a "percept" or "instantaneous percept." We define a stable percept as a convergent sequence of instantaneous percepts. Assuming that the sets of premises and conclusions are metric spaces, we introduce a strategy for acquiring stable percepts, called directed convergence. We consider probabilistic inferences, where the premise and conclusion sets are spaces of probability measures, and in this context we study Bayesian probabilistic/recursive inference. In this type of Bayesian inference the premises are probability measures, and the prior as well as the posterior is updated nontrivially at each iteration. This type of Bayesian inference is distinguished from classical Bayesian statistical inference where the prior remains fixed, and the posterior evolves by conditioning on successively more punctual premises. We indicate how the directed convergence procedure may be implemented in the context of Bayesian probabilistic/recursive inference. We discuss how the L(infinity) metric can be used to give numerical control of this type of Bayesian directed convergence. Copyright 2001 Academic Press.     

Ruminative subtypes and coping responses: Active and passive pathways to depressive symptoms

Individuals draw on a variety of cognitive strategies—some active, some passive—as a way of coping with stress and dysphoria. Previous research suggests that the impact of rumination—one such strategy—on depression depends on whether rumination takes the passive form of brooding versus the more active form of reflection. This study tests whether brooding and reflection explain the effects of passive versus active coping responses, respectively, on depressive symptoms. In an undergraduate sample (n=284), brooding partially mediated the relationship between passive coping and depressive symptoms, whereas reflection did not. Reflection moderated the relationship between active coping and symptoms, such that low active copers who were high in reflection endorsed more symptoms than those low in reflection. Brooding and reflection may operate within cognitive–behavioural response pathways characterised by an active/passive distinction. Whether reflection is maladaptive likely depends on the active nature of the surrounding coping response.     

Knowing when to seek anger: Psychological health and context-sensitive emotional preferences

According to hedonic approaches to psychological health, healthy individuals should pursue pleasant and avoid unpleasant emotions. According to instrumental approaches, however, healthy individuals should pursue useful and avoid harmful emotions, whether pleasant or unpleasant. We sought to reconcile these approaches by distinguishing between preferences for emotions that are aggregated across contexts and preferences for emotions within specific contexts. Across five days, we assessed daily confrontational and collaborative demands and daily preferences for anger and happiness. Somewhat consistent with hedonic approaches, when averaging across contexts, psychologically healthier individuals wanted to feel less anger, but not more happiness. Somewhat consistent with instrumental approaches, when examined within contexts, psychologically healthier individuals wanted to feel angrier in more confrontational contexts, and some wanted to feel happier in more collaborative contexts. Thus, although healthier individuals are motivated to avoid unpleasant emotions over time, they are more motivated to experience them when they are potentially useful.     

Coping and anxiety in college students after the September 11th terrorist attacks

This study investigated the presence of a stress response after the September 11^th terrorist attacks in a sample of indirectly affected college students living in Boston, Massachusetts. Anxiety was examined at two time intervals, approximately 2 and 4 months after the attacks. Methods of coping with the stress of the attacks (assessed using the COPE Inventory) and their impact on initial and longer-term anxiety were also examined. Results demonstrated that the majority of college students in the study were severely psychologically impacted initially by the terrorist attacks. However, this initial impact appears to decay over time for most people. Several potentially maladaptive coping strategies were found to be predictive of initial anxiety, including denial, behavioral disengagement, mental disengagement, and focus on and venting of emotions. However, only focus on and venting of emotions was found to be uniquely predictive of longer-term anxiety.     

Youth Mental Illness and the Family: Parents’ Loss and Grief

Parents and family members whose adult child or relative has a mental illness endure significant losses, to which they respond with grief. Such grief may negatively affect family members’ physical and psychological health and also the relationship with their relative. Yet, research in this field is sparse. Very few studies have examined parents’ loss and grief in the context of the patient being a child or teen. It is not clear the extent to which parents’ loss and grief in response to their child or adolescent’s mental illness is similar or different to the accounts of older parents and family members caring for an adult relative with major psychopathology (e.g., Schizophrenia, Bipolar disorder). Parental loss and grief is not often addressed in child and adolescent mental health services’ provision of care; alarmingly, little is known about how best to support parents who access these services. The present study aimed to bridge this knowledge gap and identify the therapeutic needs of this younger parent population. Comprehensive interviews were conducted with 14 parents and one custodial grandparent of a youth aged 18 years or younger who was currently attending a child and adolescent mental health service. An inductive thematic analysis identified six themes; parents’ narrative of finding out, profound and pervasive loss, complex grief, waning support, the challenges of caregiving and a call for assistance. It can be inferred from these results that youth mental illness can constitute a source of loss and grief for parents. Participants’ loss and grief was largely consistent with the experience of families caring for an adult relative with major psychopathology. Opportunities for mental health practitioners to support families’ loss and grief were identified. Further studies are needed to enhance understanding of this complex and, to a large extent, ignored familial experience. Results do underscore the importance of clinicians acknowledging parents’ loss and grief and working directly with this experience over the course of youths’ treatment, perhaps in conjunction with family psychoeducation approaches.     

Dialogical Masculinities: Diverse Youth Resisting Dominant Masculinity

The meaning of the construct “masculinity” differs culturally and changes over time. Although cultural constructions of the phenomenon change, at any given time hegemonic pressures promote participants’ compliance to masculinity norms. This hegemonic process often results in the underlying assumptions that masculinity is an essentialized unitary phenomenon and that conforming to cultural requisites is adaptive and healthy. In the field of psychology, past research investigating resistance to this hegemony and diverse constructions of masculinities categorized resistance as pathological and problematic. More recently, researchers have turned their attention to ways in which conforming to dominant hegemonic masculinity norms can be problematic and maladaptive, allowing for an understanding of the adaptive qualities that come with resisting and negotiating with hegemony. Specifically, there has been an interest in understanding diverse discourse constructions as sources of resistance to hegemonic masculinity. This project was focused on understanding the ways in which hegemonic-resistant masculinities were constructed with a group of young men who work on a youth team to prevent domestic violence. Using the constructivist framework of the dialogical self, we gleaned four distinct I-positions of masculinity that help to support a fluid and diverse process of negotiating a hegemonic-resistant and adaptive form of masculinity.