Context-dependent motor skill and the role of practice

Research has shown that retrieval of learned information is better when the original learning context is reinstated during testing than when this context is changed. Recently, such contextual dependencies have also been found for perceptual-motor behavior. The current study investigated the nature of context-dependent learning in the discrete sequence production task, and in addition examined whether the amount of practice affects the extent to which sequences are sensitive to contextual alterations. It was found that changing contextual cues-but not the removal of such cues-had a detrimental effect on performance. Moreover, this effect was observed only after limited practice, but not after extensive practice. Our findings support the notion of a novel type of context-dependent learning during initial motor skill acquisition and demonstrate that this context-dependence reduces with practice. It is proposed that a gradual development with practice from stimulus-driven to representation-driven sequence execution underlies this practice effect.     

The relationship between emotion awareness and somatic complaints in children and adolescents: Investigating the mediating role of anxiety and depression

The objective of this study was to examine if emotion awareness in children and adolescents (age 7-18 years old) is directly related to somatic complaints, and if this relationship holds when considering symptoms of anxiety and depression as mediating factors. A number of questionnaires measuring emotion awareness, symptoms of anxiety and depression and somatic complaints were administered to Dutch schoolchildren (N?=?617). A path model was constructed, with the use of structural equation modelling. The results showed that two aspects of emotion awareness (bodily awareness and differentiating between emotions) contributed to the prediction of somatic complaints. However, this was no longer the case when controlling for symptoms of anxiety and depression. Thus, in this study, no direct relation was found between emotion awareness and somatic complaints. Instead, the relation was perfectly mediated by symptoms of anxiety and depression. The results suggest that focusing only on the relation between emotion awareness and somatic complaints is an oversimplified perspective that falls short as a starting point to find therapeutic solutions for children who suffer from somatic complaints.     

Temporal order judgment criteria are affected by synchrony judgment sensitivity

Synchrony perception for audio-visual stimulus pairs is typically studied by using temporal order judgment (TOJ) or synchrony judgment (SJ) tasks. Research has shown that estimates of the point of subjective simultaneity (PSS) obtained using these two methods do not necessarily correspond. Here, we investigate the hypothesis that the PSS estimate obtained in a TOJ task is shifted in the direction of the most sensitive part of the synchrony judgment curve, as obtained in an SJ task. The results confirm that criterion shifts in the TOJ task move the PSS toward regions of the audio-visual temporal interval continuum where discriminations are most sensitive.     

Organizational Culture: Critical Questions for Researchers and Practitioners

Abstract

The idea of career self-management is part of the growing move to encourage individuals to take ownership of their own development. The article explores why this makes sense both for individuals and for organizations, and defines specific initiatives individuals and organizations should take to make the concept work successfully. It is argued that most people are unlikely to take responsibility for themselves unless there is sound organizational support, but that with the right practical initiatives they can become energized by the process. There is, however, a need for organizations to centre much more closely on understanding people as individuals if performance levels at work are to be raised from competence to excellence.     

The Neglect and Importance of Emotion at Work

This article provides an overview of the multiple roles of emotion at work. First, traditional approaches to work and well-being and their limitations are considered. The advantages of understanding more specific feeling states rather than the nonspecific states of "stress" and "satisfaction" are outlined. Next, some recent developments in activity surrounding the study of emotion at work are briefly described. A distinction is made in the article between the expression and experience of felt emotion at work. The literature around the expression of emotion at work and, in particular, emotional labour is reviewed by addressing four key questions. Then, the very limited research on the experience of emotion at work is described: The importance of looking at emotion in terms of transactions and processes rather than simple cause and effect is emphasized. Some of the implications of the overview for both practitioners and researchers are considered. The article concludes with the observation that as emotion is fundamental to nearly all aspects of work behaviour its study should be integrated with existing research on work and organizational psychology.     

Lateralized power spectra of the EEG as an index of visuospatial attention

The electroencephalogram (EEG) was measured in an endogenous orienting paradigm where symbolic cues indicated the likely side of to-be-discriminated targets. Combined results of event-related lateralizations (ERLs) and a newly derived measure from wavelet analyses that we applied on the raw EEG and individual event-related potentials (ERPs), the lateralized power spectra (LPS) and the LPS-ERP, respectively, confirmed the common view that endogenous orienting operates by anterior processes, probably originating from the frontal eye fields, modulating processing in parietal and occipital areas. The LPS data indicated that modulation takes place by increased inhibition of the irrelevant visual field and/or disinhibition of the relevant to-be-attended visual field. Combined use of ERLs, the LPS, and the LPS-ERP indicated that most of the involved processes can be characterized as externally evoked, either or not with clear individual differences as some evoked effects were only visible in the LPS-ERERP, whereas few processes seemed to have an internally induced nature. Use of the LPS and the LPS-ERP may be advantageous as it enables to determine the involvement of internally generated lateralized processes that are not strictly bound to an event like stimulus onset.     

Cognitive Complexity and the Perception of Subtle Racism

The present research demonstrated that cognitive complexity is related to the perception of contemporary, subtle racism. Results indicated that the perception of subtle racism was related to attributional complexity. Further, greater attributional complexity was also related to greater racial complexity, defined as the ability of individuals to overcome the normative assumption that racism is no longer a major social problem in the United States and the extent that individuals think about racism. The relationship between attributional complexity and racial complexity held even when accounting for need for cognition, perspective taking, empathy, and political ideology. Finally, we found that racial complexity mediated the effect of attributional complexity on the perception of subtle racism. Taken together, the results of these three studies contribute a general cognitive mechanism related to the perception of subtle racism; an extension of cognitive and attributional complexity; and a new construct, racial complexity, related to the perception of contemporary, subtle racism.     

Stacking fault and dislocation glide on the basal plane of graphite

Generalized stacking-fault energies for the basal plane of graphite are calculated from first principles for slip along two high-symmetry directions. The rhombohedral fault energy compares well with experiment and the anisotropy in behaviour is consistent with observed dislocation network geometry. Utilizing these calculated fault energies within a modified Peierls-Nabarro model, we estimate the barrier for basal dislocation motion based on lattice friction. This is found to be extremely small, from which we conclude that dislocation network interaction and pinning, rather than the Peierls barrier, must determine the practical shear strength of graphite. However, at low dislocation densities or over small crystallite regions, the shear strength should tend to this lower limit. We discuss the relevance of this to the mechanism of lubrication.     

The effects of scenario-based risk information on perceptions of susceptibility to Chlamydia and HIV

Abstract

Objectives: The Self-Report Habit Index (SRHI) was originally reported as one-dimensional; however, habit has been described as characterised by several features. Moreover, one-dimensional models for the SRHI have demonstrated poor fit. Therefore, we aimed to compare multidimensional models with a one-dimensional model in both snacking and physical activity habits, besides examining further instrument characteristics.

Design: A cross-sectional study was conducted with high school and university students (n?=?555).

Main outcome measure: The SRHI adapted for physical activity and for snaking habits was applied at one time point.

Results: Nested models with one factor, two factors and three factors were compared. Next, a hierarchical second-order model was tested, and further validity issues, as well as invariance between habits, were examined. Three-dimensional models represented a better fit for both habits. However, fit was still inadequate in the snacking version. In addition, discriminant validity concerns emerged for the physical activity SRHI. Moreover, invariance between the snacking and the physical activity versions was not confirmed.

Conclusions: Considering the SRHI as composed by the dimensions of ‘lack of awareness’, ‘lack of control’ and ‘history of behavioural repetition’ seems to be more accurate. Nevertheless, our findings suggest that further research is needed.