The problem of the additive constant and eigenvalues in metric multidimensional scaling

This paper is concerned with the additive constant problem in metric multidimensional scaling. First the influence of the additive constant on eigenvalues of a scalar product matrix is discussed. The second part of this paper is devoted to the introduction of a new formulation of the additive constant problem. A solution is given for fixed dimensionality, by maximizing a normalized index of fit with a gradient method. An experimental computation has shown that the author's solution is accurate and easy to follow.     

Multitrait-multimethod model of adolescent deviance,drug use,academic, and sexual behaviors

A multitrait-multimethod design was used to test Jessor and Jessor's (1977) problem behavior theory with a sample of adolescents, their parents, and peers. Behaviors included general deviance, drug use, low academic motivation, and precocious sexual behavior. While research has supported this theory, the reliance on self-report data for the majority of this work may threaten the validity of these findings. Results from hierarchical confirmatory factor analyses indicated that the convergent and discriminant validity of the seven behavior constructs was high and method effects were low. A two-factor second-order model, representing General Drug Use and Other Problem Behavior, accounted for a larger proportion of variance in the lower order factors compared to a single-factor model.This research was supported by Grant DA 03706 from the National Institute on Drug Abuse.     

Mental Health Problems of Children in Foster Care

We compared the rates of mental health problems in children in foster care across three counties in California. A total of 267 children, ages 0 to 17, were assessed two to four months after entry into foster care using a behavioral screening checklist, a measure of self-concept and, in one county, an adaptive behavior survey. Results confirmed previous research and indicated consistently high rates of mental health problems across the three counties. Behavior problems in the clinical or borderline range of the CBCL were observed at two and a half times the rate expected in a community population. Fewer children fell within the clinical range on the self-concept measure. No significant differences in rates between the three county foster care cohorts were observed, despite the different demographic characteristics of the counties. On the adaptive behavior scale, the mean scores for children in foster care were more than one standard deviation below the norm. Our findings suggest that the most important mental health screening issue with children in foster care is to identify what specific mental health problems need to be addressed so that the most effective treatment services can be provided.     

CHOICE MAKING TO PROMOTE ADAPTIVE BEHAVIOR FOR STUDENTS WITH EMOTIONAL AND BEHAVIORAL CHALLENGES

Two analyses investigated the effects of choice making on the responding of elementary school students with emotional and behavioral challenges. In the first analysis, 2 participants were given choices from menus of academic tasks, all of which were pertinent to their educational objectives in English and spelling, respectively. Reversal designs showed that the choice-making conditions increased task engagement and reduced disruptive behavior for both students. An additional analysis was performed with a 3rd student in an effort to further distinguish the effects of choice making from preference. In this study, one of the no-choice phases was yoked to a previous choice-making condition. This analysis demonstrated that the choice-making condition was superior to baseline and yoked control phases as determined by levels of task engagement and disruptive behavior. The findings of the two analyses contribute information relevant to students with emotional and behavioral disorders, and to a growing literature on the desirable effects of choice making for students with disabilities and challenging behaviors.     

Social problem solving in unsafe situations: Implications for sexual abuse education programs

Examined the impact of two subject variables (age and gender) and two contextual factors (antagonist age and nature of the social dilemma) on children's social problem solving (SPS). Preschoolers (N=62) were individually presented with four stories that varied the antagonist age (peer vs. adult) and social dilemma (nonsexual vs. sexual). Responses were coded for three SPS variables: number of alternative solutions, solution content, and planfulness. Younger preschoolers were less competent problem solvers in all types of unsafe situations, and, compared to girls, some aspects of boys' problem solving were compromised in sexual encounters. Results also suggest that the nature of the social dilemma, but not the age of the antagonist, affects perschoolers' SPS. Children generated fewer alternative solutions and fewer effective strategies to the sexual encounters compared to the nonsexual dilemmas. Findings are discussed in relation to research on children's SPS and child sexual abuse prevention efforts.     

Graph Theory Approach to Detect Examinees Involved in Test Collusion

Test collusion (TC) is sharing of test materials or answers to test questions before or during the test (important special case of TC is item preknowledge). Because of potentially large advantages for examinees involved, TC poses a serious threat to the validity of score interpretations. The proposed approach applies graph theory methodology to response similarity analyses for identifying groups of examinees involved in TC without using any knowledge about parts of test that were affected by TC. The approach supports different response similarity indices (specific to a particular type of TC) and different types of groups (connected components, cliques, or near-cliques). A comparison with an up-to-date method using real and simulated data is presented. Possible extensions and practical recommendations are given.     

Using behavior contracts to improve behavior of children and adolescents in multiple settings

Research has shown that behavior contracts, a form of contingency management, can promote a wide range of behavior changes for individuals in varied populations; however, relatively few studies have been conducted in nonacademic settings. In the context of two service projects, we evaluated the extent to which behavior contracts improved problem behavior for 11 children and adolescents in residential treatment facilities and foster homes using nonconcurrent multiple baseline across participants’ designs with three or more tiers and supplemental statistical analysis for each tier. Practitioners in each setting implemented individualized behavior contracts for 5 to 59 weeks. Results show that behavior improved substantially for six participants but was relatively unchanged for the other five participants. We discuss the limitations of this clinically driven study, as well as clinical implications of our mixed findings.     

Wittgenstein on Reading

The section on reading occupies quite a large amount of space in the Philosophical Investigations (PI) and Wittgenstein makes little changes to it in the course of composing the book. This shows that the section on reading is important. This paper analyzes Wittgenstein’s treatment of the philosophical problem of reading in detail. It shows that Wittgenstein rejects six philosophical ideas about what reading is and employs three different methods. This paper also shows that the section on reading is not only important for grasping Wittgenstein’s discussion on understanding, but also for comprehending the whole of PI.     

Conscious intention and human action: Review of the rise and fall of the readiness potential and Libet’s clock

Is consciousness—the subjective awareness of the sensations, perceptions, beliefs, desires, and intentions of mental life—a genuine cause of human action or a mere impotent epiphenomenon accompanying the brain’s physical activity but utterly incapable of making anything actually happen? This article will review the history and current status of experiments and commentary related to Libet’s influential paper (Brain 106:623–664, 1983) whose conclusion “that cerebral initiation even of a spontaneous voluntary act …can and usually does begin unconsciously” has had a huge effect on debate about the efficacy of conscious intentions. Early (up to 2008) and more recent (2008 on) experiments replicating and criticizing Libet’s conclusions and especially his methods will be discussed, focusing especially on recent observations that the readiness potential (RP) may only be an “artifact of averaging” and that, when intention is measured using “tone probes,” the onset of intention is found much earlier and often before the onset of the RP. Based on these findings, Libet’s methodology was flawed and his results are no longer valid reasons for rejecting Fodor’s “good old commonsense belief/desire psychology” that “my wanting is causally responsible for my reaching.”.     

母亲负性情绪与儿童外化问题行为的关系：家庭嘈杂度的调节作用

摘 要 对251名学前儿童及母亲进行一年的追踪来考察母亲负性情绪与学前儿童外化问题之间的关系及这一关系是否受到家庭嘈杂度的影响。结果: (1) T1儿童外化问题能正向预测T2母亲负性情绪,而T1母亲负性情绪对T2儿童外化问题的预测不显著;(2)与低嘈杂家庭相比,高嘈杂家庭中儿童外化问题对母亲负性情绪的预测作用更强,且儿童外化问题也更为稳定。结论：母亲负性情绪与儿童外化问题的关系主要表现为儿童效应,且这一效应受到家庭环境的调节。