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PubMed2006

Testing the Rasch model by means of the mixture fit index.

Rudas, Clogg, and Lindsay (RCL) proposed a new index of fit for contingency table analysis. Using the overparametrized two-component mixture, where the first component with weight 1-w represents the model to be tested and the second component with weight w is unstructured, the mixture index of fit was defined to be the smallest w compatible with the saturated two-component mixture. This index of fit, which is insensitive to sample size, is applied to the problem of assessing the fit of the Rasch model. In this application, use is made of the equivalence of the semi-parametric version of the Rasch model to specifically restricted latent class models. Therefore, the Rasch model can be represented by the structured component of the RCL mixture, with this component itself consisting of two or more subcomponents corresponding to the classes, and the unstructured component capturing the discrepancies between the data and the model. An empirical example demonstrates the application of this approach. Based on four-item data, the one- and two-class unrestricted latent class models and the one- to three-class models restricted according to the Rasch model are considered, with respect to both their chi-squared statistics and their mixture fit indices.

Humans↗
PubMed2006

Quantifying social asymmetric structures.

Many social phenomena involve a set of dyadic relations among agents whose actions may be dependent. Although individualistic approaches have frequently been applied to analyze social processes, these are not generally concerned with dyadic relations, nor do they deal with dependency. This article describes a mathematical procedure for analyzing dyadic interactions in a social system. The proposed method consists mainly of decomposing asymmetric data into their symmetric and skew-symmetric parts. A quantification of skew symmetry for a social system can be obtained by dividing the norm of the skew-symmetric matrix by the norm of the asymmetric matrix. This calculation makes available to researchers a quantity related to the amount of dyadic reciprocity. With regard to agents, the procedure enables researchers to identify those whose behavior is asymmetric with respect to all agents. It is also possible to derive symmetric measurements among agents and to use multivariate statistical techniques.

Algorithms↗
PubMed2004

The impact of model misfit on partial credit model parameter estimates.

The partial credit model (PCM) is commonly employed to parameterize items and individuals using responses to a set of polytomous items. Because the PCM does not include a discrimination parameter, it may encounter substantial lack of fit to the data in certain situations. To determine the impact of model misfit on the estimation of person and item parameters using the PCM, a simulation study was conducted in which data were generated according to the generalized partial credit model, and the bias and efficiency of the resulting person and item parameter estimates were assessed. The results suggest that small amounts of unsystematic misfit do not lead to dramatic levels of bias or loss of efficiency of the estimators, but large levels of unsystematic misfit and moderate levels of systematic misfit result in substantial loss of efficiency and bias of the estimators.

Humans↗
PubMed2006

Genotype by environment interaction in adolescents' cognitive aptitude.

In a replication of Turkheimer, Haley, Waldron, D'Onofrio, Gottesman II (2003, Socioeconomic status modifies heritability of IQ in young children. Psychological Science, 14:623-628), we investigate genotype-environment (G x E) interaction in the cognitive aptitude of 839 twin pairs who completed the National Merit Scholastic Qualifying Test in 1962. Shared environmental influences were stronger for adolescents from poorer homes, while genetic influences were stronger for adolescents from more affluent homes. No significant differences were found between parental income and parental education interaction effects. Results suggest that environmental differences between middle- to upper-class families influence the expression of genetic potential for intelligence, as has previously been suggested by Bronfenbrenner and Ceci's (1994, Nature-nurture reconceptualized in developmental perspective: a bioecological model Psychological Review, 101:568-586) bioecological model.

Adolescent↗
PubMed2006

An exploration of the experience of gaining awareness of deficit in people who have suffered a traumatic brain injury.

Gaining awareness of deficits was explored in 10 people with moderate to severe traumatic brain injury (TBI) using a semi-structured interview and interpretative phenomenological analysis. Eight master themes emerged from the transcripts. Knowledge of deficits was acquired through personal discovery and the reactions of others, often outside the rehabilitation environment. Rehabilitation provided explanations and a normalising and supportive environment that facilitated people in acknowledging their deficits. Most participants spontaneously referred to denial and saw this as an active cognitive and behavioural process that both helped and hindered recovery. The emotional reaction to learning about deficits was described largely in terms of fear and loss and resonates with psychological models of grief.

Adaptation, Psychological↗
PubMed2003

Models of causation and the semantics of causal verbs.

This research examines the relationship between the concept of CAUSE as it is characterized in psychological models of causation and the meaning of causal verbs, such as the verb cause itself. According to focal set models of causation (; ), the concept of CAUSE should be more similar to the concepts of ENABLE and PREVENT than either is to each other. According to a model based on theory of force dynamics, the force dynamic model, the concepts of CAUSE, ENABLE, and PREVENT should be roughly equally similar to one another. The relationship between these predictions and the meaning of causal verbs was examined by having participants sort causal verbs and rate them with respect to the dimensions specified by the two models. The results from five experiments indicated that the force dynamic model provides a better account of the meaning of causal verbs than do focal set models of causation. Implications for causal inference and induction are discussed.

Humans↗
PubMed2006

The association of psychological stress and health related quality of life among patients with stroke and hypertension in Gaza Strip.

BACKGROUND: The study was performed to investigate the association of psychological stress and quality of life (QOL) among patients with the cardiovascular disease (CVD) of hypertension plus stroke or hypertension only. METHODS: The WHOQOL-BREF questionnaire was applied to 112 hypertensive patients with hypertension plus stroke and 224 hypertensive patients without stroke. Psychological stress was assessed with SCL-90. Means scale scores were compared using student-t-test and predictors of QOL were calculated with covariance analysis. RESULTS: Patients with stroke had a significant lower QOL than patients without stroke and a significantly higher level of stress (p < 0.01). In analyses of covariance psychological stress was significantly correlated to all domains of QOL among non-stroke patients. The same psychological and sociodemographic factors showed little impact on the stroke patients in these multivariable analyses. In these models psychological stress had a significant impact on the global domain of QOL among stroke patients. Income and gender were the only sociodemographic factors being significantly associated with the physical (education) and social (gender) domains of QOL in stroke patients. CONCLUSION: Psychological stress was strongly correlated with all domains of QOL in patients without stroke and was only partly associated with QOL among patients with stroke. Future studies should investigate if psychological stress is a factor suitable for educational and psychological interventions aiming at stress reduction in CVD patients which might substantially contribute to better health related quality of life in these patients.

Journal Article↗
PubMed2005

The development of a cognitive model of schizophrenia: placing it in context.

This review provides a historical perspective on a model for schizophrenia based on results of experiments derived from learning theory. It was developed by the author in collaboration with Jeffrey Gray and numerous colleagues, (e.g. [Gray, J.A., McNaughton, N., 2000. The Neuropsychology of Anxiety. second ed. Oxford University Press, Oxford; Hemsley, D.R., 1987a An experimental psychological model for schizophrenia. In: Hafner, H., Gattaz, W.F., Janzarik, W. (Eds.), Search for the Causes of Schizophrenia, vol. 1. Springer, New York, pp. 179-188.; Hemsley, D.R., 1993. A simple (or simplistic?) cognitive model for schizophrenia. Behaviour Research and Therapy 31, 633-646]. It contrasts with earlier cognitive formulations [e.g. Hemsley, D.R., 1975. A two stage model of attention in schizophrenia research. British Journal of Social and Clinical Psychology 14, 81-88], which emphasised a weakening of contextually elicited response biases, and lacked a link to potential neural bases of the disorder. The model emphasizes the need to demonstrate patterns of performance that are not interpretable in terms of the well established 'generalized deficit' manifest in schizophrenia. It proposes that the cognitive disturbance is a change in the way stored material is integrated with sensory input and ongoing motor programmes. In particular, spatial and temporal context fail to activate appropriate stored regularities. A number of possible pathways from the cognitive disturbance to the symptoms of schizophrenia are outlined; again the term 'context' is widely employed. Thus, it has been invoked to explain the occurrence of hallucinations, delusions, thought disorder and disruptions in the sense of personal identity. However the term 'context' is ill-defined and the review indicates the variety of ways in which it may exert its influence. These are unlikely to reflect the operation of a unitary mechanism.

Animals↗
PubMedDate not supplied

Cognitive-behavioral psychology and oral hygiene. A new perspective on an old problem.

This article describes the application of learning principles derived from behavioral and cognitive psychology to oral hygiene. It reviews the theoretical basis of a plaque prevention approach based on psychological models of self-control behavior. This approach was derived from research on learning environments, interviewing, behavior modification, and cognitive psychology.

Attitude to Health↗
PubMedDate not supplied

Predictors of state legislators' intentions to vote for cigarette tax increases.

BACKGROUND: This study analyzed influences on state legislators' decisions about cigarette tax increase votes using a research strategy based on political science and social-psychological models. METHODS: Legislators from three states representing a spectrum of tobacco interests participated in personal interviews concerned with tobacco control legislation (n = 444). Measures of potential predictors of voting intention were based on the consensus model of legislative decision-making and the theory of planned behavior. Multiple logistic regression methods were used to identify social-psychological and other predictors of intention to vote for cigarette tax increases. RESULTS: General attitudes and norms concerning cigarette tax increases predicted legislators' intention to vote for cigarette tax increases. More specific predictors included perceptions of public health impact and retail sales impact of cigarette tax increases. Constituent pressure was the strongest perceived social influence. Political party and state also were strong predictors of intention. Results were consistent with related research based on political science models. CONCLUSIONS: Legislators' votes on cigarette tax increases may be influenced by their perceptions of positive and negative outcomes of a cigarette tax increase and by perceived constituent pressures. This research model provides useful insights for theory and practice and should be refined in future tobacco control research.

Female↗
PubMed2001

Intensive care unit syndrome: a consideration of psychological interventions.

There is little in the psychological literature to guide clinicians treating ICU patients presenting with the ICU syndrome. Existing psychological models need to be developed and adapted in the management of these cases. This paper describes two clinical cases and offers psychological formulations and descriptions of treatment.

Adult↗
PubMed2001

Intensive care unit syndrome: A consideration of psychological interventions.

There is little in the psychological literature to guide clinicians treating ICU patients presenting with the ICU syndrome. Existing psychological models need to be developed and adapted in the management of these cases. This paper describes two clinical cases and offers psychological formulations and descriptions of treatment.

Journal Article↗
PubMed1977

A comparison of the community psychology and medical models: teaching attitudes toward deviance to high school students.

There is increased recognition of the importance of early intervention as part of a comprehensive system of community psychology. Moreover, emphasis on intervention at the system level is recommended to maximize effectiveness. However, in designing early intervention system-related programs, the content of the intervention is a critical, though often ignored, feature. This study compared a traditional medical model content with a community psychology-oriented content in teaching attitudes toward deviance to high school students. Results indicated that the significant changes in attitudes differed markedly between groups exposed to the divergent explanatory models, and that, in general, the community psychology model produced more favorable outcomes.

Adolescent↗
PubMed2005

Applications of individual growth curve modeling for pediatric psychology research.

OBJECTIVE: To provide a brief, nontechnical introduction to individual growth curve modeling for the analysis of longitudinal data. Several applications of individual growth curve modeling for pediatric psychology research are discussed. METHODS: To illustrate these applications, we analyze data from an ongoing pediatric psychology study of the possible impact of spina bifida on child and family development (N = 135). Three repeated observations, spaced by approximately 2 years, contributed to the analyses (M age at baseline = 8.84). RESULTS: Results indicated that individual linear growth curves of emotional autonomy varied as a function of the youth gender by spina bifida group membership interaction. CONCLUSIONS: Strengths of individual growth curve modeling relative to more traditional methods of analysis are highlighted (e.g., completely flexible specification of the time variable, explicit modeling of both aggregate-level and individual-level growth curves).

Adaptation, Psychological↗
PubMed1991

Reporting structural equation modeling results in Psychology and Aging: some proposed guidelines.

Structural equation modeling (SEM) is now widely used in social and behavioral science research. SEM provides the possibility of fitting, and evaluating the fit, of well-specified, theoretical models to empirical data--more generally, of testing elaborated psychological theories. The options available to users of these approaches are many and varied. Popular SEM computational software packages, such as LISREL and EQS, provide a large amount of information, and there is some uncertainty as to what should be routinely reported. A series of guidelines are proposed for reporting SEM results in articles submitted to Psychology and Aging. The suggested guidelines ask authors using SEM methodology to provide important analysis information that will enable readers to evaluate the findings.

Aged↗
PubMed2001

Carryover bias in visual assessment.

Carryover of stimuli in sequential judgments was studied for a visual assessment task involving estimation of the percentage cover of black circles on a white image. Seven image types with different levels of cover density were arranged in a sequentially balanced design in which each image type was preceded the same number of times by all image types. In the absence of carryover, when images were preceded by images with the same cover density, the response scores were well fitted by a power function of percentage cover with a mean exponent of 0.73 over subjects. Carryover took the form of an assimilation, so that the cover estimate for a target image was generally higher when preceded by an image with higher cover, and lower when preceded by an image with lower cover. However, the magnitude of the carryover effect showed little evidence of increasing with difference in cover between successive images. Nonparametric and parametric methods for testing for carryover are presented. The need for development of psychological models to explain the proposed statistical models is discussed.

Adolescent↗