High-dimensional maximum marginal likelihood item factor analysis by adaptive quadrature

Although the Bock–Aitkin likelihood-based estimation method for factor analysis of dichotomous item response data has important advantages over classical analysis of item tetrachoric correlations, a serious limitation of the method is its reliance on fixed-point Gauss-Hermite (G-H) quadrature in the solution of the likelihood equations and likelihood-ratio tests. When the number of latent dimensions is large, computational considerations require that the number of quadrature points per dimension be few. But with large numbers of items, the dispersion of the likelihood, given the response pattern, becomes so small that the likelihood cannot be accurately evaluated with the sparse fixed points in the latent space. In this paper, we demonstrate that substantial improvement in accuracy can be obtained by adapting the quadrature points to the location and dispersion of the likelihood surfaces corresponding to each distinct pattern in the data. In particular, we show that adaptive G-H quadrature, combined with mean and covariance adjustments at each iteration of an EM algorithm, produces an accurate fast-converging solution with as few as two points per dimension. Evaluations of this method with simulated data are shown to yield accurate recovery of the generating factor loadings for models of upto eight dimensions. Unlike an earlier application of adaptive Gibbs sampling to this problem by Meng and Schilling, the simulations also confirm the validity of the present method in calculating likelihood-ratio chi-square statistics for determining the number of factors required in the model. Finally, we apply the method to a sample of real data from a test of teacher qualifications.     

Motion and edge sensitivity in perception of object unity

Although much evidence indicates that young infants perceive unitary objects by analyzing patterns of motion, infants' abilities to perceive object unity by analyzing Gestalt properties and by integrating distinct views of an object over time are in dispute. To address these controversies, four experiments investigated adults' and infants' perception of the unity of a center-occluded, moving rod with misaligned visible edges. Both alignment information and depth information affected adults' and infants' perception of object unity in similar ways, and infants perceived object unity by integrating information about object features over time. However, infants perceived a moving, misaligned, three-dimensional object as indeterminate in its connectedness, whereas adults perceived it as connected behind the occluder. These findings indicate that the effectiveness of common motion in specifying unified surfaces across an occluder is reduced by misalignment of edges. Alignment information enhances perception of object unity either by serving directly as information for unity or by optimizing the detectability of motion-carried information for unity. In addition, young infants are able to retain information about edge orientation over short intervals in determining connectedness via a process of spatiotemporal integration.     

攻击行为儿童大脑半球某些认知特点的研究

为了解攻击行为儿童大脑两半球的认知活动特点,采用侧视野速示呈现技术,对径“同伴提名量表”筛选的１７名攻南 儿童和１６名正常儿童进行了比较研究。     

The multiple self: working with dissociation and trauma

This paper describes a patient who appears to have a chronic dissociative personality disorder. Renewed clinical interest in dissociative disorders had arisen in North America in the 1980s, in part due to the influence of the Women's Movement which had highlighted the incidence of child sexual abuse. The early psychological observations of Janet, Freud and Jung on hysterical patients who displayed dissociative phenomena were similar to those displayed by the patient. consideration is given to theoretical understanding of the condition, taking into account the views of the earlier theorists and object-relations theory. The possibility of trauma, in particular childhood sexual abuse, as a causative factor in dissociative disorders is discussed.     

医学分子生物学的发展历程和展望

回顾了医学分子生物学的发展历程,展望了新世纪的医学分子生物学,分子生物学的理论和技术进步改变了医学研究的格局和观念,使人们对疾病的认识深入到分子水平,分子病,基因病,构象病和信息病等概念继续被提出。医学分子生物学的未来发展必将更紧密地与其它学科如细胞生物学,发育生物学,神经生物学,理论医学等相结合,实现分子水平,细胞水平和整体水平的整合,创造更加辉煌的成就。     

My Perspective on Psychotherapy Integration: An Outsider Who's Out of It

My rejoinder is a response to two commentaries on my SEPI keynote in 1997: commentaries written by Goldfried and Cullari. Instead of grappling with the ideas I presented, both respondents were distracted by my satirical beginning. In my talk I proposed a method for studying psychotherapy integration. I am not pessimistic about the potential for integration, nor am I pessimistic about psychotherapy. But I am a skeptic, and science is driven—and indeed advance—by skepticism. In fact, psychotherapy integration requires that its advocates be skeptics. I still do not know what psychotherapy integration is, and remain confused. I can only conclude that I am not only an outsider, but out of it.     

Young Muslim Women in France: Cultural and Psychological Adjustments

Even though France has experienced increasing and inevitable feminization in its immigrant population since 1974, research has tended to ignore the role of immigrant women, especially Muslim women, in the migration process. Public attention has been diverted by concern over such relatively marginal issues as the headscarf affair, and insufficient attention has been paid to the important role Muslim women play in France, especially those coming from Algeria. These women function as cultural mediators between the traditional culture of the sending country and the modern one of the host country. They see themselves as both tradition-bearers and integration proponents. The demands of immigration have given rise to the growth and development of different leaders, among them cultural mediators seeking a bridge between Islam and modernity, economic mediators seeking to establish women in the media and as entrepreneurs, and political mediators who seek access to power at the local level for the immigrants. These new mediators will eventually shape a new generation of female actors very far from the traditional countries of origin, although for the time being they still suffer from the inequality of rights for women and chances in their overall social life.     

An Integrative Brief Treatment Approach for Obsessive-Compulsive Disorder

This article reports on the integrated application of cognitive therapy, transactional analysis techniques, and the behavioral technique of response prevention using self-instructional training and behavioral substitution in a brief therapy approach. These methods were applied in the case of a young man who presented with compulsions to perform repetitive and ordering rituals with the belief that it would prevent his girlfriend from becoming pregnant. A 21-year-old white male who had performed 3 to 5 hours of rituals daily for several years was able to eliminate the majority of his compulsive behaviors and reduce his level of anxiety after eight clinical therapy sessions. Results were maintained at 6-month follow-up. The clear precipitating factors and the unusual maintaining variables for the disorder in the client are described. The author discusses the case in light of current theoretical, therapeutic, and biomedical understandings of the disorder.     

Psychotherapy Integration: Contributions from Lifestyle Theory

The lifestyle theory of intervention is evaluated with respect to its status as an integrated psychotherapy using theoretical integration, technical eclecticism, and the common factors approach as criteria. Because lifestyle theory integrates concepts from evolutionary biology, existential philosophy, cognitive psychology, social learning theory, and various therapeutic models it satisfies preliminary criteria for theoretical integration. To the extent that it provides an internally consistent model and makes use of techniques from disparate schools of psychotherapy, it adopts a technical eclectic approach to intervention. The lifestyle model also appears to qualify as an integrated psychotherapy by virtue of its attention to several common factors in psychotherapy.