The Heteroscedastic Graded Response Model with a Skewed Latent Trait: Testing Statistical and Substantive Hypotheses Related to Skewed Item Category Functions

The Graded Response Model (GRM; Samejima, Estimation of ability using a response pattern of graded scores, Psychometric Monograph No.?17, Richmond, VA: The Psychometric Society, 1969) can be derived by assuming a linear regression of a continuous variable, Z, on the trait, ??, to underlie the ordinal item scores (Takane & de Leeuw in Psychometrika, 52:393?C408, 1987). Traditionally, a normal distribution is specified for Z implying homoscedastic error variances and a normally distributed ??. In this paper, we present the Heteroscedastic GRM with Skewed Latent Trait, which extends the traditional GRM by incorporation of heteroscedastic error variances and a skew-normal latent trait. An appealing property of the extended GRM is that it includes the traditional GRM as a special case. This enables specific tests on the normality assumption of Z. We show how violations of normality in Z can lead to asymmetrical category response functions. The ability to test this normality assumption is beneficial from both a statistical and substantive perspective. In a simulation study, we show the viability of the model and investigate the specificity of the effects. We apply the model to a dataset on affect and a dataset on alexithymia.     

Neuropsychological Sequelae of PTSD and TBI Following War Deployment among OEF/OIF Veterans

Posttraumatic stress disorder (PTSD) and mild traumatic brain injury (mTBI) are highly prevalent among Veterans of the conflicts in Iraq and Afghanistan. These conditions are associated with common and unique neuropsychological and neuroanatomical changes. This review synthesizes neuropsychological and neuroimaging studies for both of these disorders and studies examining their co-occurrence. Recommendations for future research, including use of combined neuropsychological and advanced neuroimaging techniques to study these disorders alone and in concert, are presented. It is clear from the dearth of literature that addiitonal studies are required to examine and understand the impact of specific factors on neurocognitive outcome. Of particular relevance are temporal relationships between PTSD and mTBI, risk and resilience factors associated with both disorders and their co-occurrence, and mTBI-specific factors such as time since injury and severity of injury, utilizing comprehensive, yet targeted cognitive tasks.     

Childhood Sexual Abuse and Intimate Relationships: A Support Group for Male Partners

Individual and group therapy modalities are common approaches to treating survivors of child sexual abuse (CSA). Survivors have identified a number of interpersonal problems that they experience with romantic partners but little is known about the partner’s perspective. Additionally, partners of abuse survivors are generally excluded from the treatment process. A short-term support group for the partners of adult survivors of sexual abuse was conducted concurrently with an Incest Resolution Group. The goal of the Partner’s Support Group was to gain greater understanding of the interpersonal relational problems as experienced by the partners, and to provide support, insight, and education regarding the impact of CSA. Clinical implications are discussed.     

Contextual Factors for Research on Psychological Therapies for Aboriginal Australians

This paper is to provide a commentary to Can cognitive behavioural therapy (CBT) be effective for Aboriginal Australians? Perspectives of Aboriginal practitioners trained in CBT. It is inspiring that this study has found that CBT can play a useful role in therapy for Aboriginal and Torres Strait Islander people but the outcomes need to be considered with caution. CBT can provide a useful tool when working with Aboriginal and Torres Strait Islander people, but in itself is not adequate for a number of reasons. Firstly, it is not culturally responsive but can be part of an approach that might be culturally appropriate. The authors are compelled at this point to give a history of mental health and Aboriginal and Torres Strait Islander people to provide a background context to the discussion and to illustrate why some psychological approaches such as CBT can only ever be part of the tools that might be used in a broader framework, that is required to address and strengthen Aboriginal and Torres Strait Islander people's well‐being.     

Patterns of personality pathology in patients with generalized anxiety disorder, panic disorder with and without agoraphobia, and social phobia

The relationship between co-occurring personality disorders and anxiety disorders (panic disorder with or without agoraphobia, social phobia, and generalized anxiety disorder) was examined, taking into account the effect of major depression. This article describes findings for 622 participants in the Harvard/Brown Anxiety Research Project, a longitudinal follow-up study of DSM-III-R-defined anxiety disorders. A total of 24% of participants had at least one personality disorder, with avoidant, obsessive compulsive, dependent, and borderline most common. Generalized anxiety disorder, social phobia, and major depression were positively associated with the occurrence of one or more personality disorders, whereas panic disorder with agoraphobia was not associated. Major depression was associated in particular with dependent, borderline, histrionic, and obsessive compulsive personality disorders and social phobia was associated with avoidant personality disorder. Whereas some of our findings confirm results from earlier studies, others are somewhat inconsistent with previous results and indicate the need for further investigation.     

Theoretical perspectives on language and communication problems in mental retardation and developmental disabilities

We argue that researchers interested in language and communication problems in mental retardation or any other developmental disorder should view such problems as emerging within the broader context of the behavioral profile, or phenotype, associated with a particular genetic condition. This will require understanding the direct and indirect effects of genes on the development of language and communication and thereby an understanding of the complex relations that exist between language and other dimensions of psychological and behavioral functioning as well as an understanding of the environments in which the developing person acts and is acted upon. We believe that the dominant model for understanding language and communication problems--the nativist approach, which emphasizes the child's innate capacity for acquiring language and characterizes language as consisting of a set of context-free deterministic rules that operate on abstract representations--is inconsistent with an emphasis on indirect genetic effects. We review recent evidence that undermines the nativist approach--evidence concerning the initial state of the language-learning child, the role of environmental input, the competence-performance distinction, and modularity. In place of nativism, we argue for Emergentism, which is a model in which language is seen to emerge from the interaction between the child's biological abilities to map statistical properties of the language input into a distributed representation and the characteristics of the language learning environment and for the purpose of engaging in real-time, meaningful language use.     

Explaining modulation of reasoning by belief

Although deductive reasoning is a closed system, one's beliefs about the world can influence validity judgements. To understand the associated functional neuroanatomy of this belief-bias we studied 14 volunteers using event-related fMRI, as they performed reasoning tasks under neutral, facilitatory and inhibitory belief conditions. We found evidence for the engagement of a left temporal lobe system during belief-based reasoning and a bilateral parietal lobe system during belief-neutral reasoning. Activation of right lateral prefrontal cortex was evident when subjects inhibited a prepotent response associated with belief-bias and correctly completed a logical task, a finding consistent with its putative role in cognitive monitoring. By contrast, when logical reasoning was overcome by belief-bias, there was engagement of ventral medial prefrontal cortex, a region implicated in affective processing. This latter involvement suggests that belief-bias effects in reasoning may be mediated through an influence of emotional processes on reasoning.     

Dreading the pain of others? Altruistic responses to others' pain underestimate dread

A dislike of waiting for pain, aptly termed ‘dread’, is so great that people will increase pain to avoid delaying it. However, despite many accounts of altruistic responses to pain in others, no previous studies have tested whether people take delay into account when attempting to ameliorate others' pain. We examined the impact of delay in 2 experiments where participants (total N = 130) specified the intensity and delay of pain either for themselves or another person. Participants were willing to increase the experimental pain of another participant to avoid delaying it, indicative of dread, though did so to a lesser extent than was the case for their own pain. We observed a similar attenuation in dread when participants chose the timing of a hypothetical painful medical treatment for a close friend or relative, but no such attenuation when participants chose for a more distant acquaintance. A model in which altruism is biased to privilege pain intensity over the dread of pain parsimoniously accounts for these findings. We refer to this underestimation of others' dread as a ‘Dread Empathy Gap’.     

Self-schema for assertiveness: Extending the validity of the self-schema construct

This research attempted to extend the validity of the self-schema concept by examining a previously untested self-attribute and by examining self-schema effects on the interpretation of more realistic stimulus situations than used in past studies. The attribute was a self-schema for assertiveness and the validity of this self-knowledge structure was evaluated in two studies. In Stuty 1 assertion schematics and aschematics were compared for retrieval of schema-relevant information on a laboratory task of incidental recall. In Study 2 schematics and aschematics were compared on five different tasks that required elaboration of information about rights assertion conflict situations. Study 1 results revealed that schematics as compared to aschematics recalled more assertion related adjectives but did not differ in recall of domain-irrelevant words. Results from Study 2 showed that schematics as compared to aschematics recalled more past instances of assertive behaviors when asked to elaborate why an assertion adjective was endorsed as “Like me”. Also, schematics were significantly more certain they would behave assertively both in situations where assertion was appropriate and in those where compromise was more appropriate. On two perceptual factors known to correlate with assertive behavior, schematics were more likely to judge moderately legitimate requests (i.e., ambiguous requests) as more unreasonable and when asked to generate expected consequences for assertive responses focused more on self rather than other person consequences. The consistency of the results with respect to various hypothesized functions of the self-schema construct are discussed.