Cooperative Learning Contingencies: Unrelated versus Related Individual and Group Contingencies

College students operating under related cooperative contingencies (students had to earn individual credit before being considered for group credit) showed more consistent individual and group improvement on exam performance than students operating under unrelated contingencies (individual credit and group credit were independently determined). A balanced ratio between individual and group credit proved to be the most productive ratio under the related contingency, whereas a ratio favoring group credit over individual credit proved most productive under the unrelated contingency. In general, a ratio favoring individual credit over group credit was the least productive in promoting both individual and group improvement under both unrelated and related contingencies. The findings showed less difference in improvement of exam scores for students of different performance levels than had been evident in previous research.     

Processing of compound visual stimuli by children with autism and Asperger syndrome

A typical modes of visual processing are common in individuals with autism. In particular, and unlike typically developing children, children with autism tend to process the parts of a complex object as a priority, rather than attending to the object as a whole. This bias for local processing is likely to be due to difficulties in assembling subparts into a coherent whole, as proposed by Frith ( 10 1989) using the term “weak central coherence” or WCC. This study was aimed to better characterize the processing of complex visual stimuli by children with autism. Thirteen children with autistic spectrum disorders were individually paired with children of two control groups, one matched on verbal mental age (VMA) and one matched on chronological age (CA). Participants from the three groups were tested in two tasks. The first task involved hierarchical global/local stimuli, inspired by Navon ( 30 1977). The second task employed compound face‐like or geometrical stimuli. This task emphasized the processing of configural properties of the stimuli (i.e., spatial relationships). Children from the three groups showed a perceptual bias favouring the global dimension of the stimuli in the first task. By contrast, children with autism were deficient compared to normal children for the processing of the configural dimensions of the stimuli in the second task. These results suggest that visual cognition of children with autism is characterized by a dissociation between global and configural processing, with global processing being preserved and configural processing being altered in these children, therefore delineating the extents and limits of the WCC theory (Frith, 10 1989).     

Instantaneous Motion

There is a longstanding definition of instantaneous velocity. It saysthat the velocity at t ₀ of an object moving along a coordinate line is r if and only if the value of the first derivative of the object's position function at t ₀ is r. The goal of this paper is to determine to what extent this definition successfully underpins a standard account of motion at an instant. Counterexamples proposed by Michael Tooley (1988) and also by John Bigelow and Robert Pargetter (1990) are reinforced and illuminated by considering the presence or absence of changes to the object's motion.     

Counseling Transgendered,Transsexual, and Gender‐Variant Clients

The emergent consciousness and political activism within the transgender community has important implications for the field of counseling. In the current paradigm, the focus has shifted from using surgical and hormonal interventions and thereby enabling transgendered persons to “pass” within the traditional gender binary of society to affirming the unique identities of transgendered persons. To prepare counselors, counselor educators, and counseling supervisors for this important challenge, the authors describe the evolving nature of the transgender community, discuss mental health issues and counseling interventions for use with transgendered clients, and present a case study detailing the progression of counseling with 1 transgendered client.     

从心肌细胞再生看心脏修复认识的新突破

心脏细胞再生的研究是当前心血管研究领域的热点之一。传统的观点认为心肌细胞就像神经细胞一样是终末分化细胞,它不再分化,不再分裂,也不能再生,换句话说,人一旦出生其心肌细胞数量就固定不变,近年来,随着干细胞研究的不断深入,不仅在干细胞移植再生心肌研究中取得了可喜的成果,而且发现心肌细胞本身也具有分裂,再生的能力,使得心肌细胞不能再生的“经典论断”受到挑战,最终被打破,这一科学观念的更新历程体现了科学认识发展的一般规律和特点,给我们带来许多有益的启示。     

Marital Estrangement,Positive Feelings Toward Partners,and Locus of Control: Female Counselors Married to Alcohol‐Abusing and Non‐Alcohol‐Abusing Spouses

Marital estrangement, positive feelings toward spouses, and locus of control among a national sample of 323 female counselors who were either married or formerly married to alcohol‐abusing or to non‐alcohol‐abusing male partners were examined. Statistically significant differences between groups were found.     

Psychotic symptoms and violence toward others — a literature review of some preliminary findings: Part 2. Hallucinations

According to the clinical impressions of a number of authors and mental health professionals, an increased risk of violence is associated with the presence of hallucinations and — in particular — command hallucinations. In contrast to this, some empirical studies have reported that there is no evidence of such a relationship. The present review examines the role of hallucinations in violence toward others. Possible empirical evidence for a violence-escalating interaction between delusions and hallucinations is also analyzed. Among the main findings were: There appears to be no evidence that auditory command hallucinations are dangerous per se. However, there is some evidence that voices ordering acts of violence toward others may increase compliance and thereby be conducive to violent behavior. Finally, the evidence for or against the existence of a possible violence-escalating interaction between delusions and hallucinations is inconclusive. The findings are discussed particularly in relation to problems of measurement and other research design factors. Discrepancies between some of the findings of the present review and current clinical lore are also briefly considered.     

Introspection and subliminal perception

Subliminal perception (SP) is today considered a well-supported theory stating that perception can occur without conscious awareness and have a significant impact on later behaviour and thought. In this article, we first present and discuss different approaches to the study of SP. In doing this, we claim that most approaches are based on a dichotomic measure of awareness. Drawing upon recent advances and discussions in the study of introspection and phenomenological psychology, we argue for both the possibility and necessity of using an elaborated measure of subjective states. In the second part of the article, we present findings where these considerations are implemented in an empirical study. The results and implications are discussed in detail, both with reference to SP, and in relation to the more general problem of using elaborate introspective reports as data in relation to studies of cognition.