Bayesian Estimation for Item Factor Analysis Models with Sparse Categorical Indicators

Psychometric models for item-level data are broadly useful in psychology. A recurring issue for estimating item factor analysis (IFA) models is low-item endorsement (item sparseness), due to limited sample sizes or extreme items such as rare symptoms or behaviors. In this paper, I demonstrate that under conditions characterized by sparseness, currently available estimation methods, including maximum likelihood (ML), are likely to fail to converge or lead to extreme estimates and low empirical power. Bayesian estimation incorporating prior information is a promising alternative to ML estimation for IFA models with item sparseness. In this article, I use a simulation study to demonstrate that Bayesian estimation incorporating general prior information improves parameter estimate stability, overall variability in estimates, and power for IFA models with sparse, categorical indicators. Importantly, the priors proposed here can be generally applied to many research contexts in psychology, and they do not impact results compared to ML when indicators are not sparse. I then apply this method to examine the relationship between suicide ideation and insomnia in a sample of first-year college students. This provides an important alternative for researchers who may need to model items with sparse endorsement.     

Recombinative generalization of subword units using matching to sample

The purpose of the current study was to develop and test a computerized matching-to-sample (MTS) protocol to facilitate recombinative generalization of subword units (onsets and rimes) and recognition of novel onset-rime and onset-rime-rime words. In addition, we sought to isolate the key training components necessary for recombinative generalization. Twenty-five literate adults participated. Conditional discrimination training emerged as a crucial training component. These findings support the effectiveness of MTS in facilitating recombinative generalization, particularly when conditional discrimination training with subword units is used.     

美国人格障碍共病问题研究介评

在美国,自从DSM体系建立起来,人格障碍就一直受到研究者及临床人员的关注。随着DSM-III将人格障碍归于独立的一轴,发展起全新的诊断思路,人格障碍的共病问题就尤其受到了重视。该文首先介绍了共病问题的状况及主要的几种解释模型,然后就该领域出现的应对方式及研究方案作了系统总结,最后还就如何认识共病问题等提出了思考     

Assessing long‐term maintenance of staff performance following behavior skills training in a home‐based setting

We used a multiple baseline across participant design to evaluate the effects of behavior skills training on teaching three behavior therapists to implement discrete trial teaching (DTT) and evaluate the long‐term maintenance of skills acquired through behavioral skills training. For participants whose skills did not maintain, the authors evaluated an independent self‐evaluation procedure on their performance. Following DTT implementation training, maintenance probes were assessed at 2‐, 4‐, 6‐, and 8‐week follow‐ups. The results demonstrated that one participant maintained 100% procedural integrity (PI) through all follow‐ups, one participant decreased below mastery criterion at the 2‐week follow‐up, and one participant dropped below mastery criterion at the 4‐week follow‐up. Those participants that demonstrated decreased accuracy of implementation of DTT programs and were taught to implement a self‐evaluation procedure. Following self‐evaluation, PI maintained for up to 7 weeks for one participant. Our results suggest that if PI does not maintain, self‐evaluation may be a supplementary intervention to increase and maintain PI of new employees.     

What happens to an individual visual working memory representation when it is interrupted?

This study tested the hypothesis that even the simplest cognitive tasks require the storage of information in working memory (WM), distorting any information that was previously stored in WM. Experiment 1 tested this hypothesis by requiring observers to perform a simple letter discrimination task while they were holding a single orientation in WM. We predicted that performing the task on the interposed letter stimulus would cause the orientation memory to become less precise and more categorical compared to when the letter was absent or when it was present but could be ignored. This prediction was confirmed. Experiment 2 tested the modality specificity of this effect by replacing the visual letter discrimination task with an auditory pitch discrimination task. Unlike the interposed visual stimulus, the interposed auditory stimulus produced little or no disruption of WM, consistent with the use of modality‐specific representations. Thus, performing a simple visual discrimination task, but not a simple auditory discrimination task, distorts information about a single feature being maintained in visual WM. We suggest that the interposed task eliminates information stored within the focus of attention, leaving behind a WM representation outside the focus of attention that is relatively imprecise and categorical.     

效度概化的理论研究述评

效度概化（validity generalization：VG）是心理测量理论和元分析的结合体,也是元分析在人事测评领域的重要应用。它深刻地挑战了人事测评效度的情景特异论,在工业与组织心理学的发展历程当中具有里程碑意义。该文系统地介绍了效度概化理论的逻辑思路、主要模型、关键理论语与应用,以及研究趋势。     

Generalization of conditioned fear-potentiated startle in humans: experimental validation and clinical relevance

Though generalization of conditioned fear has been implicated as a central feature of pathological anxiety, surprisingly little is known about the psychobiology of this learning phenomenon in humans. Whereas animal work has frequently applied methods to examine generalization gradients to study the gradual weakening of the conditioned-fear response as the test stimulus increasingly differs from the conditioned stimulus (CS), to our knowledge no psychobiological studies of such gradients have been conducted in humans over the last 40 years. The current effort validates an updated generalization paradigm incorporating more recent methods for the objective measurement of anxiety (fear-potentiated startle). The paradigm employs 10, quasi-randomly presented, rings of gradually increasing size with extremes serving as CS+ and CS−. The eight rings of intermediary size serve as generalization stimuli (GSs) and create a continuum-of-similarity from CS+ to CS−. Both startle data and online self-report ratings demonstrate continuous decreases in generalization as the presented stimulus becomes less similar to the CS+. The current paradigm represents an updated and efficacious tool with which to study fear generalization—a central, yet understudied conditioning-correlate of pathologic anxiety.     

Learning generalization in problem solving by a blue-fronted parrot (<Emphasis Type="Italic">Amazona aestiva</Emphasis>)

Pepperberg (The Alex studies: cognitive and communicative abilities of gray parrots. Harvard University Press, Cambridge;1999) showed that some of the complex cognitive capabilities found in primates are also present in psittacine birds. Through the replication of an experiment performed with cotton-top tamarins (Saguinus oedipus oedipus) by Hauser et al. (Anim Behav 57:565-582; 1999), we examined a blue-fronted parrot's (Amazona aestiva) ability to generalize the solution of a particular problem in new but similar cases. Our results show that, at least when it comes to solving this particular problem, our parrot subject exhibited learning generalization capabilities resembling the tamarins'.