Searching night and day: a dissociation of effects of circadian phase and time awake on visual selective attention and vigilance

How does sleepiness affect selective attention? We studied the effect of circadian phase and time awake on visual search. The generalized-cognitive-slowing hypothesis predicts that search rate will be slower, feature guidance less effective, and response time (RT) lengthened when observers are sleepy. Observers performed spatial-configuration (finding a 5 among 2s) and conjunction (finding red vertical among red horizontal and green vertical) search tasks during 38 hr of wakefulness under constant conditions. Adverse circadian phases and elapsed time awake did lead to increased RT (corrected for errors). However, contrary to the hypothesis, search rates (indexed by RT x Set Size slopes) were constant across the protocol. This was true for conjunction as well as for spatial-configuration search, indicating that feature guidance was also insensitive to sleepiness. The locus of sleepiness effects on search is probably downstream from the bottleneck of attentional selection. Observers did trade accuracy for speed when sleepy. This implicates decision-stage impairments.     

Presenting multiple auditory signals using multiple sound cards in Visual Basic 6.0

In auditory research, it is often desirable to present more than two auditory stimuli at any one time. Although the technology has been available for some time, the majority of researchers have not utilized it. This article provides a simple means of presenting multiple, concurrent, independent auditory events, using two or more different sound cards installed within a single computer. By enabling the presentation of more auditory events, we can hope to gain a better understanding of the cognitive and attentional processes operating under more complex and realistic scenes, such as that embodied by thecocktail party effect. The software requirements are Windows 98SR2/Me/NT4/2000/XP, Visual Basic 6.0, and DirectX 7.0 or above. The hardware requirements are a Pentium II, 128 MB RAM, and two or more different sound cards.     

Coping Self-Efficacy as a Mediator of Distress Following a Natural Disaster

Social-cognitive theory and conservation-of-resources theory were utilized to understand individual differences in psychological response to natural disaster. Coping self-efficacy, lost resources, social support, and optimism were assessed along with demographic variables in predicting distress following Hurricane Opal. Participants included 67 residents of Okaloosa County, Florida. Multiple regression analyses indicated that coping self-efficacy was the strongest predictor of general distress and trauma-related distress. Loss of resources and gender were also important predictors of general distress. Path analyses demonstrated that lost resources directly influenced general distress, social support, optimism, and coping self-efficacy. These analyses also indicated that coping self-efficacy perceptions mediated the relationships between loss of resources and trauma-related distress, social support and both trauma and general distress, and optimism and both types of distress. Theoretical implications are discussed.     

Personal Identity, Reductionism and the Necessity of Origins

A thought that we all entertain at some time or other is that the course of our lives might have been very different from the way they in fact have been, with the consequence that we might have been rather different sorts of persons than we actually are. A less common, but prima facie intelligible thought is that we might never have existed at all, though someone rather like us did. Arguably, any plausible theory of personal identity should be able to accommodate both possibilities. Certain currently popular Reductionist theories of personal identity, however, seem to be deficient in precisely this respect. This paper explores some Reductionist responses to that challenge. This revised version was published online in July 2006 with corrections to the Cover Date.     

Enhancing Training Efficiency and Effectiveness Through the Use of Dyad Training

The authors examined the effect of inserting observation practice and undirected dialog into the rest interval between practice trials on the learning of a complex task (stabilometer). Training protocols in which learners practice in pairs (dyads) result in increases in learning efficiency, but the critical issue is the effect on learning effectiveness. Three groups of participants (n = 12 in each group) practiced maintaining their balance on a stabilometer. One group practiced individually, and the other 2 groups practiced in dyads in which 1 performer practiced the task while the other observed. In the dyad-alternate condition, participants alternated between physical, observational, and dialog practice on each trial, whereas in the dyad-control condition, subjects completed all trials on 1 form of practice (either physical or observational practice) before engaging in the other form. The results indicated that the dyad-alternate group initially performed more poorly but quickly overtook the individual group, and the performance advantage of the dyad-alternate group was maintained on the delayed retention test. When the different forms of practice were performed consecutively, as in the dyad-control group, acquisition and retention performance was generally poorer than when they were alternated. Those results suggest that one can combine the benefits of physical practice, observation, and dialog between learners in an interactive way to produce an effective and efficient learning protocol.     

The Relevance of Multiculturalism for Aging

Though multiculturalists focus on race and minority status, issues of central importance to the aged, multiculturalism has not infiltrated the gerontology literature. However, since the so-called natural stages of life are cultural formations, each one a valuable creation, the topic of aging would certainly benefit from a connection to multiculturalism and its critique of the demands of assimilation.     

Relative Value Units: Using the New “Currency” for Measuring Clinical Productivity in a Productivity/Incentive Plan

This paper presents an overview of a productivity/incentive plan for faculty in an academic medicine center's department of behavioral medicine and psychiatry. The model utilizes the Resource-Based Relative Value Scale (RBRVS) for its measurement of clinical productivity. The paper provides an introduction to RBRVS terminology and how the RBRVS system was developed. The productivity/incentive plan developed for the Department of Behavioral Medicine and Psychiatry, West Virginia University School of Medicine, Morgantown, is described. The advantages and limitations of utilizing Relative Value Units (RVUs) in a productivity model are discussed. The paper may provide helpful insights to those charged with developing productivity/incentive plans at other academic health science centers.     

A Model of Psychological Distress for Mothers of Children with Attention-Deficit Hyperactivity Disorder

We functionally defined and tested a model of psychological distress for mothers of children diagnosed with Attention-Deficit Hyperactivity Disorder (ADHD). This operationalized model includes three latent constructs which are hypothesized to influence mother's psychological symptomatology: Parenting Stress, Parent Characteristics, and Environment Characteristics. Structural equation modeling was used to reformulate and test the measurement models and the overall model. Data supported a model with some empirically-based model revisions founded on both comparisons of best fit and by an examination of statistical modification indices. The final model maintained the Parenting Stress and Parental Characteristics constructs, but replaced independent environmental variables with a more generalized construct of life stress.