A semiparametric approach for item response function estimation to detect item misfit

When scaling data using item response theory, valid statements based on the measurement model are only permissible if the model fits the data. Most item fit statistics used to assess the fit between observed item responses and the item responses predicted by the measurement model show significant weaknesses, such as the dependence of fit statistics on sample size and number of items. In order to assess the size of misfit and to thus use the fit statistic as an effect size, dependencies on properties of the data set are undesirable. The present study describes a new approach and empirically tests it for consistency. We developed an estimator of the distance between the predicted item response functions (IRFs) and the true IRFs by semiparametric adaptation of IRFs. For the semiparametric adaptation, the approach of extended basis functions due to Ramsay and Silverman (2005) is used. The IRF is defined as the sum of a linear term and a more flexible term constructed via basis function expansions. The group lasso method is applied as a regularization of the flexible term, and determines whether all parameters of the basis functions are fixed at zero or freely estimated. Thus, the method serves as a selection criterion for items that should be adjusted semiparametrically. The distance between the predicted and semiparametrically adjusted IRF of misfitting items can then be determined by describing the fitting items by the parametric form of the IRF and the misfitting items by the semiparametric approach. In a simulation study, we demonstrated that the proposed method delivers satisfactory results in large samples (i.e., N ≥ 1,000).     

Affective and cognitive attitudes,uncertainty avoidance and intention to obtain genetic testing: An extension of the Theory of Planned Behaviour

To ensure successful implementation of genetic screening and counselling according to patients best interests, the attitudes and motives of the public are important to consider. The aim of this study was to apply a theoretical framework in order to investigate which individual and disease characteristics might facilitate the uptake of genetic testing. A questionnaire using an extended version of the Theory of Planned Behaviour was developed to assess the predictive value of affective and cognitive expected outcomes, subjective norms, perceived control and uncertainty avoidance on the intention to undergo genetic testing. In addition to these individual characteristics, the predictive power of two disease characteristics was investigated by systematically varying the diseases fatality and penetrance (i.e. the probability of getting ill in case one is a mutation carrier). This resulted in four versions of the questionnaire which was mailed to a random sample of 2400 Norwegians. Results showed genetic test interest to be quite high, and to vary depending on the characteristics of the disease, with participants preferring tests for highly penetrant diseases. The most important individual predictor was uncertainty avoidance.     

Is the Motor or the Garage More Important to the Car? The Difference Between Semantic Associations in Single Word and Sentence Production

The aim of the present study was to investigate the impact of part-whole (e.g., car-motor) and functional associations (e.g., car-garage) on single word (Experiment 1) and sentence production (Experiment 2). In Experiment 1, a classical picture-word task was used. In Experiment 2, the same stimuli and distractors were embedded into a sentence. The relation between target and distractor was either part-whole, functional or unrelated. At single word level, part-whole and functional relations facilitate naming. Additionally, the facilitation effect was stronger for part-whole in comparison to functional associations. During sentence production, facilitation shifted to interference. The difference between both relations disappeared. The findings of the different effects between functional and part-whole associations depend on the length of utterances and highlight the divergent impact of associations. The differences between part-whole and functional associations in single word production might reflect a differential organization of associative links at the conceptual level. In contrast, during sentence production the syntactic processing at the lexical level seem to be more important than types of semantic associations at the conceptual level.     

Visuospatial Short-Term Memory Explains Deficits in Tower Task Planning in High-Functioning Children with Autism Spectrum Disorder

Previous findings on planning abilities in individuals with high-functioning autism spectrum disorder (HFA) are inconsistent. Exploring possible reasons for these mixed findings, the current study investigated the involvement of memory in planning performance in 15 children with HFA and 17 typically developing controls. In addition to planning abilities (measured with the Tower of London), short-term memory and delayed recall for verbal as well as visuospatial material were assessed. Findings suggest that particularly reduced efficiency in visuospatial short-term memory is associated with Tower task planning deficits in children with HFA.     

Aus vier mach zwei

Background

The diagnostic and statistical manual of mental disorders 5 (DSM-5) includes a revision of the DSM-IV criteria for somatoform disorders. The aim of the current work was to investigate whether (a) patients with DSM-IV diagnoses of somatization disorder, pain disorder and hypochondriasis and (b) whether patients categorized as having the DSM-5 somatic symptom disorder and illness anxiety disorder differ with respect to illness anxiety and cognition regarding somatic symptoms.

Material and methods

The data from 269 inpatients from the psychosomatic clinic Schön Klinik Bad Bramstedt were used. Somatoform disorders were diagnosed using the German version of the structured clinical interview for DSM-IV (SCID).

Results

Patients with a DSM-IV diagnosis of hypochondriasis differed in illness anxiety and catastrophizing interpretation of somatic symptoms compared to patients with other somatoform disorders. Patients with illness anxiety disorder differed in the catastrophizing interpretation of physical symptoms, autonomic sensations, bodily weakness and intolerance of physical complaints compared to patients with somatic symptom disorder.

Conclusion

The present results indicate that illness anxiety and a catastrophizing interpretation of somatic symptoms play a fundamental role in patients with somatoform disorders. Therefore, psychotherapy should address illness anxiety and health-related concerns in all patients with somatoform disorders.     

When the half-full glass is appraised as half empty and memorised as completely empty: Mood-congruent true and false recognition in depression is modulated by salience

Since the 1980s a large body of empirical effort has been devoted to mood-congruent memory (MCM) biases in clinical depression. Whereas there is broad, albeit not unequivocal, evidence that depressive patients retain negative-valenced memory items better than neutral material, few studies have investigated false memories in depression. In a pilot study we gathered support for both enhanced true and false memory for emotional material in depression. The present study aimed to extend these preliminary findings. In view of investigations suggesting that arousing and meaningful stimuli have facilitated access to memory, personal salience was considered a moderator for MCM. In the present study 21 depressed and 22 healthy participants were presented six false memory lists dealing with neutral, negative, and positive themes. At recognition, each item had to be appraised for its degree of valence subsequent to an old–new judgement. Pre-categorised and subjective valence did not discriminate groups. However, relative to controls depressed patients showed both more veridical as well as false recognition for items that concurrently elicited higher salience ratings in patients. In contrast, group differences in recognition performance did not significantly affect salience ratings. Results indicate that salience modulates MCM and may account for discrepancies in the literature.     

Children's and Adults’ Ability to Build Online Emotional Inferences During Comprehension of Audiovisual and Auditory Texts

Two studies examined inferences drawn about the protagonist's emotional state in movies (Study 1) or audiobooks (Study 2). Children aged 5, 8, and 10 years old and adults took part. Participants saw or heard 20 movie scenes or sections of audiobooks taken or adapted from the TV show Lassie. An online measure of emotional inference was designed that assessed the ability of the participants to understand the main protagonist's emotional state. The participants’ emotional knowledge and media literacy were assessed as further variables. The results of the studies provide evidence that children from the age of 5 build emotional inferences when both watching movies and listening to audiobooks. A developmental trend exists with regard to the precision of the emotional inferences. Media literacy and emotional knowledge differed in terms of their influence on the ability to generate inferences, which was dependent on the age of the participant and the presentation mode.     

Social Identity and Intergroup Conflict

This paper explores why people identify with social groups and what this identification signifies for their sense of self, status in society and intergroup conflict. We describe various theories of social identity to elucidate ways in which individuals can negotiate their different social identities, and what this means for intergroup relations. We consider the implications for both majority and minority group members, and those from high and low status groups. We show that social identification is an essential part of an individual’s social existence, and that such identification is inextricably related to intergroup conflict. While overarching common identities have been hailed as a possible panacea for conflict, we demonstrate that such identities have differential effects for minority and majority group members. There is a serious tension between the assimilationist preference that the majority wishes for minority members to adopt, and the integrationist position that the minority group themselves prefer. We conclude with a call to focus research efforts on how to balance the needs of the many and the few in pluralist and unequal societies.