Anticipating One's Troubles: The Costs and Benefits of Negative Expectations

Although negative expectations may have the benefit of softening the blow when a negative event occurs, they also have the cost of making people feel worse while they are waiting for that event to happen. Three studies suggest that the cost of negative expectations is greater than the benefit. In 2 laboratory experiments and a field study, people felt worse when they were expecting a negative than a positive event; but once the event occurred, their prior expectations had no measurable influence on how they felt. These results suggest that anticipating one's troubles may be a poor strategy for maximizing positive affect.Psycholog

An Examination of College Students’ Computer Self-Efficacy as Related to Various Demographic Characteristics

Despite extensive computer exposure, today’s students vary in their judgments of their capabilities in using technology, referred to as computer self-efficacy (CSE). A survey of university students revealed highest CSE in word processing skills followed closely by file management and presentation skills. Students reported moderate ability levels in spreadsheet skills and less than moderate skill levels in database management, webpage design, and computer programming. Females tended to report higher CSE in file management and word processing applications, whereas males indicated higher CSE in web page development. Students whose parents did not attend college were likely to have lower CSE in spreadsheet applications, presentation software, and database applications as compared to students whose parents attended college

Measuring College Students’ Technology Selfefficacy

The pervasiveness of computer technology and continuing developments in software, multimedia, and Internet resources have led to the implementation of new teaching and learning methods. Educators committed to the integration of technology into the learning process believe it will expand learning and better prepare students to participate effectively in today’s workplace. Employers demand workers who can not only use technology to complete a variety of work tasks and processes but who can leverage technology to advance the firm’s strategic operations. While many students perceive themselves to be computer competent, research indicates that their preparation is not always complete or adequate. Computer self-efficacy (CSE) refers to individuals’ judgment of their capabilities to use computers in diverse situations (Marakas, Mun, & Johnson, 1998). CSE has been shown to influence an individual’s choice to engage in a technology task and the effort expended to accomplish it (Bouffard-Bourchard, 1990). Researchers have postulated that positive attitudes toward computers, high computer self-efficacy, and low computer anxiety levels can be important factors in helping students learn computer skills and use computers

Influences on consumption of soft drinks and fast foods in adolescents

Soft drink and fast food are energy dense foodstuffs that are heavily marketed to adolescents, and are likely to be important in terms of risk of obesity. This study sought to examine the influences on soft drink and fast food consumption among adolescents as part of a cross-sectional survey of 2,719 adolescents (aged 11-16) from 93 randomly selected schools in New South Wales, Australia. Students provided information on soft drink and fast food consumption, and responded to statements examining influences over consumption. Over half of the boys and more than one third of the girls reported drinking soft drink daily, and consumption peaked in Grade 8 students. A quarter of students reported choosing soft drinks instead of water or milk, and around 40% agreed that soft drink was usually available in their homes. Availability in the home and drinking soft drinks with meals was most strongly associated with consumption in all age groups. Fast food consumption was higher among boys than girls in all age groups. Convenience and value for money yielded the strongest associations with fast foodconsumption in boys, while preferring fast food to meals at home and preferring to &ldquo;upsize&rdquo; meals were most strongly associated with consumption in girls. Interventions to reduce consumption of soft drinks should target availability in both the home and school environment by removing soft drinks and replacing them with more nutritive beverages. Fast food outlets should be encouraged to provide a greater range of healthy and competitively priced options in reasonable portions.<br /

Electrochemical Solutions for Advanced Life Support

The Oxygen Generating Assembly (OGA) on-board the International Space Station (ISS) employs a polymer electrolyte membrane (PEM) water electrolysis cell stack to electrochemically dissociate water into its two components oxygen and hydrogen. Oxygen is provided to the cabin atmosphere for crew respiration while the hydrogen is delivered to a carbon dioxide reduction system to recover oxygen as water. The design of the OGA evolved over a number of years to arrive at the system solution that is currently operational on ISS. Future manned missions to space will require advanced technologies that eliminate the need for resupply from earth and feature in-situ resource utilization to sustain crew life and to provide useful materials to the crew. The architects planning such missions should consider all potential solutions at their disposal to arrive at an optimal vehicle solution that minimizes crew maintenance time, launch weight, installed volume and energy consumption demands. Skyre is developing new technologies through funding from NASA, the Department of Energy, and internal investment based on PEM technology that could become an integral part of these new vehicle solutions. At varying stages of Technology Readiness Level (TRL) are: an oxygen concentrator and compressor that can separate oxygen from an air stream and provide an enriched oxygen resource for crew medical use and space suit recharge without any moving parts in the pure oxygen stream; a regenerative carbon dioxide removal system featuring a PEM-based sorbent regenerator; a carbon dioxide reduction system that electrochemically produces organic compounds that could serve as fuels or as a useful intermediary to more beneficial compounds; and an electrochemical hydrogen separator and compressor for hydrogen recycle. The technical maturity of these projects is presented along with pertinent performance test data that could be beneficial in future study efforts

Model selection for prognostic time-to-event gene signature discovery with applications in early breast cancer data

Model selection between competing models is a key consideration in the discovery of prognostic multigene signatures. The use of appropriate statistical performance measures as well as verification of biological significance of the signatures is imperative to maximise the chance of external validation of the generated signatures. Current approaches in time-to-event studies often use only a single measure of performance in model selection, such as logrank test p-values, or dichotomise the follow-up times at some phase of the study to facilitate signature discovery. In this study we improve the prognostic signature discovery process through the application of the multivariate partial Cox model combined with the concordance index, hazard ratio of predictions, independence from available clinical covariates and biological enrichment as measures of signature performance. The proposed framework was applied to discover prognostic multigene signatures from early breast cancer data. The partial Cox model combined with the multiple performance measures were used in both guiding the selection of the optimal panel of prognostic genes and prediction of risk within cross validation without dichotomising the follow-up times at any stage. The signatures were successfully externally cross validated in independent breast cancer datasets, yielding a hazard ratio of 2.55 [1.44, 4.51] for the top ranking signature.</p

Auditory sequence processing reveals evolutionarily conserved regions of frontal cortex in macaques and humans.

An evolutionary account of human language as a neurobiological system must distinguish between human-unique neurocognitive processes supporting language and evolutionarily conserved, domain-general processes that can be traced back to our primate ancestors. Neuroimaging studies across species may determine whether candidate neural processes are supported by homologous, functionally conserved brain areas or by different neurobiological substrates. Here we use functional magnetic resonance imaging in Rhesus macaques and humans to examine the brain regions involved in processing the ordering relationships between auditory nonsense words in rule-based sequences. We find that key regions in the human ventral frontal and opercular cortex have functional counterparts in the monkey brain. These regions are also known to be associated with initial stages of human syntactic processing. This study raises the possibility that certain ventral frontal neural systems, which play a significant role in language function in modern humans, originally evolved to support domain-general abilities involved in sequence processing

The Surprising Power of Neighborly Advice

Two experiments revealed that (i) people can more accurately predict their affective reactions to a future event when they know how a neighbor in their social network reacted to the event than when they know about the event itself and (ii) people do not believe this. Undergraduates made more accurate predictions about their affective reactions to a 5-minute speed date (n = 25) and to a peer evaluation (n = 88) when they knew only how another undergraduate had reacted to these events than when they had information about the events themselves. Both participants and independent judges mistakenly believed that predictions based on information about the event would be more accurate than predictions based on information about how another person had reacted to it.Psycholog