The evolution of asphyxial defense

From the time animals became dependent upon molecular oxygen as an integral part of their energy-producing processes, they have remained in the shadow of acute asphyxial threat—the blocking of respiratory exchange resulting in the intracellular triad of hypoxia, hypercapnia and acidosis. The most commonly occurring precipitant of acute asphyxia has always been the transfer between air and water environments. Over the last one hundred years studies on a wide range of living organisms, from single cells to complex multicellular organisms like mammals, have demonstrated the presence of well-defined metabolic and cardiovascular-respiratory mechanisms for protecting living things against acute asphyxia. Single-celled animals depend upon anaerobiosis and secondarily hypometabolism. In addition to these processes, animals with gills or lungs utilize “passive” protection such as increased oxygen storage and the “dynamic” cardiovascular adjustments of bradycardia and selective ischemia. These latter changes decrease overall oxygen consumption and hence utilize the oxygen stores in the most economical way to protect the cardiac and cerebral tissue, which are most sensitive to hypoxia and vital to continued survival of the organism. In this article an attempt is made to place these processes into an evolutionary context. As through a glass darkly we glimpse asphyxial defense running like a paleophysiological thread through hundreds of millions of years, being accentuated here and muted there, depending upon the particular needs of individual species.     

A taylor-russell/naylor-shine utility calculator

A program for calculating the Taylor-Russell and Naylor-Shine utility estimates is described. These utility estimates are used for determining the benefit to an organization of certain personnel interventions such as training and selection. Calculation of these estimates involves inversion of the standard normal cumulative distribution function and computation of the standard bivariate normal integral.     

Dynamic and Static Work-Family Relationships

This study investigated the linkages between work and family of 281 dual-employed couples. First, we developed a theoretical framework, distinguishing between the causal direction and the sign of the relationship between work and family. We classified the social and psychological mechanisms that explain specific directions and signs of work–family relationships and reviewed the empirical literature from the point of view of this framework. We then provided an illustration of how this framework can be used to generate a model for a specific sample. We generated a model and corresponding hypotheses for a sample of dual-employed couples in which the male′s career was dominant and analyzed these hypotheses by testing males and females separately using LISREL 7. In our sample, the relationship between work and family was reciprocal for males, suggesting a dynamic system in which males were able to adjust one domain to compensate for the other. Females exhibited a unidirectional relationship from family to work involvement, suggesting a static system. For both males and females, the family → work involvement relationship was negative as hypothesized. For males, the work → family relationship was positive. There were some similarities and some differences in the influence of exogenous constructs in the models for males and females. Results are discussed in terms of the importance of understanding dynamic versus static models of work and family relationships and the potential role of organizations in helping their employees lower the fixed demands of the family.     

Children use vowels to help them spell consonants

English spelling is highly inconsistent in terms of simple sound-to-spelling correspondences but is more consistent when context is taken into account. For example, the choice between ch and tch is determined by the preceding vowel (coach, roach vs. catch, hatch). We investigated children's sensitivity to vowel context when spelling consonants in monosyllabic nonwords. Second graders (7-year-olds) tended to use vowel context correctly when spelling word-final consonants (codas). This use of context was progressively stronger for third and fifth graders as well as for college students. The increase is not due to differences in vocabulary because the contextual patterns are similar in reading materials targeted at all four age groups. Vowel letters (graphotactics) had a stronger influence than did vowel pronunciation. Children also used vowel context when spelling word-initial consonants (onsets); this effect was as strong for second graders as for adults. Thus, novice spellers take advantage of graphotactic information.     

Use of morphology in spelling by children with dyslexia and typically developing children

In English and some other languages, spelling problems that arise at a phonological level can sometimes be solved through consideration of morphology. For example, children could infer that tuned should contain an n and that fighting should contain a t because their stems include these letters. Children could thus avoid misspellings that might otherwise occur, such as "tud" and "fiding." We used a spelling-level match design to examine the extent to which children with dyslexia and younger typical children use morphology in this way. Both groups of children benefited from morphology to some extent, but not as much as they could have given their knowledge of the stems. Our results suggest that the spellings produced by older children with dyslexia are similar to those of younger normal children in their morphological characteristics, as well as in other ways.     

360 degree feedback: accuracy, reactions, and perceptions of usefulness

This study examined how 360 degree feedback ratings and self-other rating discrepancies related to reactions to feedback, perceptions of feedback accuracy, perceived usefulness of the feedback, and recipients' receptivity to development. The results indicated that less favorable ratings were related to beliefs that feedback was less accurate and to negative reactions. Negative reactions and perceptions that feedback was less accurate were related to beliefs that the feedback was less useful. Those who found feedback less useful were perceived by a facilitator as less development-focused. Goal orientation did not moderate the relationship between ratings and perceptions of accuracy or reactions to feedback. Goal orientation was related to perceptions of usefulness of the process several weeks after receipt of feedback. The results question widely held assumptions about 360 degree feedback that negative and discrepant feedback motivates positive change.     

Use of landmark features and geometry by children and adults during a two-dimensional search task

Three- to six-year-old children (n = 28) and adults (n = 46) participated in a two-dimensional search task that included geometry and feature conditions. During each of 24 trials, participants watched as a cartoon character hid behind one of three landmarks arranged in a triangle on a computer screen. The landmarks and character then disappeared and reappeared in the same or a new position on the screen. During feature condition trials participants could use unique features of the landmarks to locate the hidden character, while during geometry trials participants could only use the geometry of the triangle. In both conditions, adults’ performance was near ceiling while children’s performance was significantly worse. Children’s performance was worse in the geometry condition than in the feature condition but search accuracy improved with age for both types of information. Findings are considered in the context of the broader literature on spatial cognition and development.     

The unconscious cost of good fortune: implicit and explicit self-esteem, positive life events, and health.

J. D. Brown and K. L. McGill (1989) found that positive life events were associated with better health only for people high in self-esteem. Among people low in self-esteem, positive life events were associated with poorer health. The authors of this study replicated this finding in a self-report survey of 61 male and 110 female college students. In addition, they showed that implicit self-esteem moderated the relation between positive life events and self-reported health in the same fashion as explicit self-esteem did. Whereas people high in implicit self-esteem reported being healthier when they experienced more positive life events, people low in implicit self-esteem reported being healthier when they experienced fewer positive life events. Moreover, the effects of implicit self-esteem were statistically independent of the effects of explicit self-esteem.