Two good reasons to say ‘change!’ – ensemble representations as well as item representations impact standard measures of VWM capacity

Visual working memory (VWM) is a central bottleneck in human information processing. Its capacity is most often measured in terms of how many individual‐item representations VWM can hold (k). In the standard task employed to estimate k, an array of highly discriminable colour patches is maintained and, after a short retention interval, compared to a test display (change detection). Recent research has shown that with more complex, structured displays, change‐detection performance is, in addition to individual‐item representations, supported by ensemble representations formed as a result of spatial subgroupings. Here, by asking participants to additionally localize the change, we reveal indication for an influence of ensemble representations even in the very simple, unstructured displays of the colour‐patch change‐detection task. Critically, pure‐item models from which standard formulae of k are derived do not consider ensemble representations and, therefore, potentially overestimate k. To gauge this overestimation, we develop an item‐plus‐ensemble model of change detection and change localization. Estimates of k from this new model are about 1 item (~30%) lower than the estimates from traditional pure‐item models, even if derived from the same data sets.     

Assessing clinically significant change: application to the SCL-90-R

A Symptom Checklist (SCL-90-R) is a potentially useful measure of psychological distress; it is frequently used in psychotherapy research and clinical practice. The purpose of this study was to illustrate the use of the SCL-90-R for determining statistically reliable change and clinical significance outlined by Jacobson and Truax in 1991. This paper describes the concepts of statistical and clinical significance of change. A proposal for obtaining and characterizing samples is made. Then a clinician's perspective is taken. Reliable change estimates and cut-off scores are chosen based on outcome data. Selected data from a single psychotherapeutic process and outcome study then were used to test the estimates of change and cut-off scores.     

Hippocampal Activations during Repetitive Learning and Recall of Geometric Patterns

Hippocampal activation is required for episodic memory. Encoding and retrieval of novel and memorable items have been related to different locations in the hippocampus; however, the data remain ambiguous. The application of a newly designed keyboard allowed investigation of brain activation during encoding and free immediate and delayed recall with functional magnetic resonance imaging (fMRI) in young healthy controls (n=12). Because of the repetitive learning and recall conditions, an individual learning gradient was used to contrast neural activity at different individual levels of novelty. During learning, subjects were asked to memorize 10 geometric patterns requiring the establishment of intra-item associations for memorization. After learning, subjects were asked to recall the items actively via the keyboard. Learning and recall were alternated five times. Delayed recall was scanned about 15 min after the fifth immediate recall condition without subjects having seen the items again. Left-sided anterior hippocampal activity was observed during conditions of initial learning as well as maximum recall. Neural activity during delayed recall did not reveal hippocampal responses and was characterized by a transition of neural activity from occipitoparietal regions to bilateral temporal cortices. We conclude that both lateralization and segregation depend on the specific relational characteristics of the stimuli requiring establishment of intra-item associations for encoding as well as retrieval. The absence of hippocampal activation during delayed recall together with the increase of lateral temporal involvement possibly corresponds with an emerging transition from episodic to long-term memory.     

When Height Carries Weight: Communicating Hidden Object Properties for Joint Action

In the absence of pre‐established communicative conventions, people create novel communication systems to successfully coordinate their actions toward a joint goal. In this study, we address two types of such novel communication systems: sensorimotor communication, where the kinematics of instrumental actions are systematically modulated, versus symbolic communication. We ask which of the two systems co‐actors preferentially create when aiming to communicate about hidden object properties such as weight. The results of three experiments consistently show that actors who knew the weight of an object transmitted this weight information to their uninformed co‐actors by systematically modulating their instrumental actions, grasping objects of particular weights at particular heights. This preference for sensorimotor communication was reduced in a fourth experiment where co‐actors could communicate with weight‐related symbols. Our findings demonstrate that the use of sensorimotor communication extends beyond the communication of spatial locations to non‐spatial, hidden object properties.     

Interpersonal Transgressions and Interest in Spiritual Activities: The Role of Narcissism

As levels of narcissism rise among Americans, it is important to understand how being narcissistic affects individuals’ day-to-day lives. One domain in which narcissism may have particularly interesting effects is individuals’ spirituality. When interpersonal expectations have been violated, individuals experience a variety of emotions. Chief among these emotions is guilt, which is linked both thematically and empirically to many aspects of Western religion. Given narcissism’s complex relationship with guilt, it is important to investigate how narcissists may react to failings in the interpersonal domain, particularly in a spiritual context. The current study investigated the effects of a simulated interpersonal failing on narcissists’ interest in a variety of spiritual behaviors, including prayer, seeking spiritual guidance, and participating in spiritual activities aimed at self-enhancement. After reading a scenario designed to induce feelings associated with interpersonal failings, participants reported their interest in a variety of religious activities, including prayer. Results indicated that the manipulation tended to decrease interest in a variety of spiritual activities across the sample, but that these effects were only robust among participants high in narcissism.     

Is there a role of depressive symptoms in the fear-avoidance model? A structural equation approach

The fear-avoidance (FA) model has gained widespread acceptance as a conceptual framework for investigating psychological factors such as FA beliefs and avoidance behavior, which contribute to chronic back pain and reduced functioning. Depressive symptoms are supposed to be related to FA beliefs and to foster avoidance behavior. This study aims to investigate the multivariate assumptions of the FA model with a focus on the role of depressive symptoms. A total of N = 360 patients with chronic nonspecific low back pain at admission of inpatient orthopedic rehabilitation participated in the survey. Measures included a numeric pain rating scale, Fear-Avoidance Beliefs Questionnaire, Pain Anxiety Symptoms Scale, Hannover Functional Ability Questionnaire and Patient Health Questionnaire. Using structural equation modeling (SEM), we construed a basic FA model and subsequently extended it by adding symptoms of depression as a covariate. The results of SEM indicated a good model fit for a basic FA model (χ²(263) = 431.069, p < .001, RMSEA = .042, CFI = .964, WRMR = .986). They confirmed the hypothesized relations and supported single mediations of the relationship between pain and functioning by FA beliefs and avoidance behavior. A second model including symptoms of depression as additional covariate (χ²(511) = 722.761, p < .001, RMSEA = .034, CFI = .956, WRMR = .949) showed a high impact of depressive symptoms on all FA model variables leading to a decrease of the FA mediations. The findings provide empirical support for the multivariate FA model and underline the importance of considering depressive symptoms in a multiple-target approach to understand the mechanisms of chronic pain.     

Does Past Condom Use Moderate the Future Condom Use Intention-Behavior Relationship? Results from a Ghanaian Sample

Behavioral intention is an important predictor of actual behavior. Yet, people often fail to act on their intentions. This study used panel data to examine whether intention interacts with past behavior in determining future behavior. Young people in the Eastern Region of Ghana (N = 956, 495 = female, 461 = male) completed a structured self-administered questionnaire, assessing intentions to use condoms and past condom use behavior at Time 1, and future condom use behavior at Time 2. Hierarchical multiple regression analyses indicated that intentions to use condoms and past condom use behavior accounted for a significant proportion of the variance in future condom use behavior. In addition, past condom use moderated the future condom use intention–behavior relationship. These results demonstrate the usefulness of considering young people's past experiences with condoms in informing the design of condom use skills training. In other words, a condom use skills training intervention that uses the pedagogical approach of starting from the “known” to the “unknown” might benefit young Ghanaians.     

是联合世界还是分裂世界？——科学和宗教：哪种观点具有真正普遍意义，哪种观点又是狭隘之极？

关于科学调查研究成果和宗教叙述之间所谓的冲突已经有很多的论述。我更愿意把精力集中在科学与宗教的方法论和观点的对比上。一、科学的普遍性或许科学最显著的特性就在于它的普遍性。科学是一项最基础和最首要的社会任务。除非一个科学家的成果能够被其他科学家理解和接受(无论是去检验它,批评它,驳倒它,还是以它为研究的基础),否则他的成果就没有任何意义。最独特的是在这项公共事业之中没有国籍、种族、宗教或者意识形态的障碍。这种以经验为依据的衡量标准为所     

Cognitive Progression in Epilepsy

The issue of cognitive progression in people with epilepsy is of considerable interest and has important clinical and theoretical implications. In this paper, we review recent studies in both the adult and childhood epilepsy literature which have included a longitudinal test–retest design to examine this question. Several important methodological issues of this literature are highlighted and areas which require more investigation are identified.     

The contrasting impact of global and local object attributes on Kanizsa figure detection

Studies on the involvement of object completions in search for illusory figures have so far reported equivocal results. We have addressed this issue by investigating at which level object attributes in Kanizsa figures influence search. Employing a paradigm that investigated global and local attributes in the composition of distractors with relation to target composition, we report a selective involvement of multilevel processing upon detection. Four experiments demonstrate that global surface information, but not the surrounding global contour, determines the speed of Kanizsa figure detection. By contrast, local inducer information is encoded far less efficiently in search than processes computing the global object. Our conclusions are that surface filling-in acts as a major determinant of search, but depends on the relevance of the particular hierarchical level (local or global) coding the target.