The learning of visually guided action: An information-space analysis of pole balancing

In cart-pole balancing, one moves a cart in 1 dimension so as to balance an attached inverted pendulum. We approached perception-action and learning in this task from an ecological perspective. This entailed identifying a space of informational variables that balancers use as they perform the task and demonstrating that they improve by traversing the space to the loci of more useful variables. We presented a novel information space-including fractional derivatives of pendulum angle (e.g., halfway between angle and angular velocity)-as possible information for balancing. Fourteen college students tried to meet a criterion of balancing the pole for 30 s on 3 of 5 successive trials, up to a maximum of 150 attempts. Loci in the fractional derivative space predicted the time series of force production well. Systematic differences were seen in loci as a function of success, and systematic changes in locus were seen with learning. The fractional derivatives were shown to predict pole angles a short time interval into the future, allowing balancers to prospectively control the action and thereby nullify visuomotor delay. In addition to loci in the information space, we analyzed loci in a calibration space, reflecting the gain relating force to information. (PsycINFO Database Record (c) 2012 APA, all rights reserved).     

The attentional processes underlying impaired inhibition of threat in anxiety: the remote distractor effect

The current study explored the proposition that anxiety is associated with impaired inhibition of threat. Using a modified version of the remote distractor paradigm, we considered whether this impairment is related to attentional capture by threat, difficulties disengaging from threat presented within foveal vision, or difficulties orienting to task-relevant stimuli when threat is present in central, parafoveal and peripheral locations in the visual field. Participants were asked to direct their eyes towards and identify a target in the presence and absence of a distractor (an angry, happy or neutral face). Trait anxiety was associated with a delay in initiating eye movements to the target in the presence of central, parafoveal and peripheral threatening distractors. These findings suggest that elevated anxiety is linked to difficulties inhibiting task-irrelevant threat presented across a broad region of the visual field.     

The influence of emotional labour and emotional work on the occupational health and wellbeing of South Australian hospital nurses

Nursing is an emotionally complex occupation, requiring performance of both emotional labour (for the benefit of the organisation and professional role) and emotional work (for the benefit of the nurse-patient relationship). According to the Conservation of Resources Theory, such processes can have a significant effect on psychological wellbeing and occupational stress, although little is known about the factors that moderate their effects. This exploratory study investigated the relationship between emotional labour and emotional work on psychological wellbeing and occupational stress in 239 nurses sampled from a South Australian hospital. The multi-component questionnaire study focused on the emotional labour elements of emotion expression and suppression, as well as surface acting and deep acting, and examined the companionship, help, and regulation elements of emotional work. In a multivariate model, emotional work was found to be less strongly predictive of negative psychological outcomes than was emotional labour, but was more strongly predictive of positive outcomes. Social support may moderate or be an antecedent to the performance of emotional labour and emotional work. The findings support the Conservation of Resources Theory with emotional work, rather than emotional labour, enabling the uptake of resources and leading to positive occupational health and wellbeing.     

A rational analysis of the acquisition of multisensory representations

How do people learn multisensory, or amodal, representations, and what consequences do these representations have for perceptual performance? We address this question by performing a rational analysis of the problem of learning multisensory representations. This analysis makes use of a Bayesian nonparametric model that acquires latent multisensory features that optimally explain the unisensory features arising in individual sensory modalities. The model qualitatively accounts for several important aspects of multisensory perception: (a) it integrates information from multiple sensory sources in such a way that it leads to superior performances in, for example, categorization tasks; (b) its performances suggest that multisensory training leads to better learning than unisensory training, even when testing is conducted in unisensory conditions; (c) its multisensory representations are modality invariant; and (d) it predicts ‘‘missing” sensory representations in modalities when the input to those modalities is absent. Our rational analysis indicates that all of these aspects emerge as part of the optimal solution to the problem of learning to represent complex multisensory environments.     

A generalized least squares regression approach for computing effect sizes in single-case research: application examples

A new method for deriving effect sizes from single-case designs is proposed. The strategy is applicable to small-sample time-series data with autoregressive errors. The method uses Generalized Least Squares (GLS) to model the autocorrelation of the data and estimate regression parameters to produce an effect size that represents the magnitude of treatment effect from baseline to treatment phases in standard deviation units. In this paper, the method is applied to two published examples using common single case designs (i.e., withdrawal and multiple-baseline). The results from these studies are described, and the method is compared to ten desirable criteria for single-case effect sizes. Based on the results of this application, we conclude with observations about the use of GLS as a support to visual analysis, provide recommendations for future research, and describe implications for practice.     

In the Eye of the Beholder: Alcohol Use and Perceptions Among Student-Patrons of ‘Joints’ in Three Nigerian University Communities

Alcohol use and its associated problems among university students have attracted empirical investigation by researchers and scholars. While many of these studies have reported a very high level of alcohol consumption and highlighted the various problems this portends, alcohol-related perceptions of this vulnerable population, which could be germane to intervention aimed at curtailing the problem, have remained largely under-researched. This cross-sectional survey examined the use and perceptions of alcohol by student-patrons (n = 1,705) of beer parlours or ‘joints’ in three university communities in Southwest Nigeria. Respondents were interviewed using AUDIT, a socio-demographic prototype and an open-ended section on alcohol-related perceptions of the students. Findings indicated that overall, 72% of the respondents perceived that alcohol is good for socializing, 68% perceived that alcohol is good in the aspect of stress reduction, 58% believed that alcohol consumption is indicative of maturity, 36% perceived that alcohol enhances their sexual performance while 39% perceived that alcohol serves to enhance alertness/concentration. Results also showed that gender (β = −. 23; p < .05), paternal alcohol use (β = .36; p < .01), parental socio-economic status (β = .33; p < .01), and residential status of university of respondents (β = .21; p < .05) significantly predicted alcohol use. The study concluded that perceptions about alcohol are very germane to understanding students’ alcohol use and should be reckoned with in designing intervention programmes. The need to adopt a ‘client-centered’ approach to the problem of student drinking behaviour was emphasized.     

Temperament,Family Environment and Anxiety in Preschool Children

This research examines the relationship between behavioural inhibition (BI), family environment (overinvolved and negative parenting, parental anxiety and parent-child attachment) and anxiety in a sample of 202 preschool children. Participants were aged between 3 years 2 months and 4 years 5 months, 101 were male. A thorough methodology was used that incorporated data from multiple observations of behaviour, diagnostic interviews and questionnaire measures. The results showed that children categorised as behaviourally inhibited were significantly more likely to meet criteria for a range of anxiety diagnoses. Furthermore, a wide range of family environment factors, including maternal anxiety, parenting and attachment were significantly associated with BI, with inhibited children more likely to experience adverse family environment factors. No interactions between temperament and family environment were found for child anxiety. However, a significant relationship between current maternal anxiety and child anxiety was found consistently even after controlling for BI. Additionally, there was some evidence of a relationship between maternal negativity and child anxiety, after controlling for BI. The results may suggest that temperament and family environment operate as additive, rather than interactive risk factors for child anxiety. This is discussed in the context of theoretical models of child anxiety and directions for future research.     

Is the emotional modulation of the attentional blink driven by response bias?

Several studies have shown that the attentional blink (AB; Raymond, Shapiro, & Arnell, 1992) is diminished for highly arousing T2 stimuli (e.g., Anderson, 2005). Whereas this effect is most often interpreted as evidence for a more efficient processing of arousing information, it could be due also to a bias to report more arousing stimuli than neutral stimuli. We introduce a paradigm that allows one to control for such a response bias. Using this paradigm, we obtained evidence that the diminished AB for taboo words cannot be explained by a response bias. This supports the idea that the emotional modulation of the AB is caused by attentional processes.