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Entrainment is a theory of causality wherein different but proximate actants are tied to one another in complementary rhythms. Entrainment proposes a naturalism of interrelatedness. Manuel DeLanda has explored the logic of social entrainment. Opposing assumptions are found in Actor Network Theory. ANT merges the sociology of knowledge and an analysis of power into a theory of pragmatic causality. Social causality is in ANT (micro‐) politically constructed. The goal of this paper is to examine entrainment as a generative theory of social construction wherein linkages of ideas, persons, actions, events and objects, unlike in ANT's translation are not saturated by (principles of) social power. Illustrations of how entrainment and ANT hold up in practice are provided.

Addressing occupational stress and fostering employee wellness helps meet a host of organizational stakeholder expectations including high quality of work life (employees), reasonable return on investment (investors), increased productivity (management), and competitiveness (owners). Despite being dynamic in nature, stress and wellness are often studied using a static perspective. One reason for the scarcity of dynamic empirical research is the limited knowledge and use of the tools available to assess change over time. To address this limitation, four tools used to assess change and dynamics of occupational stress and well-being are described: growth models, latent change score models, spectral analysis, and computational modeling. First, we begin by discussing growth curve models and then transition to latent change score models. We then expand into spectral analysis, a tool used to determine cycles of ups and downs that repeat regularly. Last, computational modeling is discussed, where computers and simulations are used to understand a dynamic process. For each tool, we give examples of how they have been used, make recommendations for future use, and provide readers with suggestions and references for how to complete analyses in software and programs, most of which are freely available (i.e., R, Vensim).

To explore the effects of circadian rhythms on mental performance in the context of the high-stakes CPA exam and to give exam candidates and practitioners insights about ways to better align rigorous mental tasks with the timing of peak mental performance.

Empirical methodology using data on CPA exam candidate characteristics and performance.

We provide evidence consistent with the belief that circadian rhythms affect CPA exam performance. After controlling for other performance factors, we document lower CPA exam scores and pass rates for those exams begun in the early workday hours or in the afternoon, relative to those exams begun in the late morning.

As is typical with empirical methodology, our findings may be due to factors/variables other than those under consideration.

Insights regarding circadian rhythms can potentially be used to better align rigorous mental tasks with the timing of peak mental performance, thereby yielding better performance by the CPA profession.

Among the goals of the CPA profession is the protection of the public. Thus, improved performance by the CPA profession can yield benefits to society at large.

To our knowledge, ours is the first study to explore the possible effect of circadian rhythms on CPA exam performance. Given the high-stakes nature of the exam, we believe our chapter can give exam candidates and practitioners valuable insights about ways to better align rigorous mental tasks with the timing of peak mental performance. This can benefit them both for the CPA exam as well as during their careers.

There have been several developments during the past year that will aid biologists in their constant battle to keep up with the scientific and technical literature. The Institute for Scientific Information (ISI) has introduced three new online services that are designed for current awareness and retrospective searches: ISI/CompuMath — access to pure and applied math literature; ISI/ISTP&B — index to scientific proceedings and books; and ISI/BIOMED — research front specialties in biomedicine.

Biological oscillatory activity in neural networks has been intensively studied over the past years. Neuronal oscillations are the basis of many different behavioral patterns and sensory mechanism. Understanding the dynamic properties of these mechanisms is useful for analyses of biological functions and medical diagnoses. The dynamic characteristics of wake‐sleep circadian rhythms and ECG’s cardiac cycle data measured for normal subjects are identified here, using MA‐BP neural network model. It was found that dynamics of regular components can be captured by the model. The captured dynamics are kept in a steady state for some periods. The order of the MA neural network was suppressively controlled by the first 2∼3 orders. Hence it may be useful for medical diagnoses of circadian rhythms and heart related diseases.

Late life depression is often associated with a poor response to antidepressants; therefore an alternative strategy for therapy is required. Although several studies have reported that phosphatidylserine (PS) may be effective for late life depression and that omega-3 fatty acids DHA and EPA have also proven beneficial for many higher mental functions, including depression, no concrete conclusion has been reached. This study was performed to clarify the effect of PS and omega-3 fatty acid-containing supplement for late life depression by not only clinical evaluation but also salivary cortisol levels. Eighteen elderly subjects with major depression were selected for the study. In all, insufficient improvement had been obtained by antidepressant therapy for at least 6 months. The exclusion criteria from prior brain magnetic resonance images (MRI) included the presence of structural MRI findings compatible with stroke or other gross brain lesions or malformations, but not white matter hypersensitivities. They took a supplement containing PS 100 mg, DHA 119 mg and EPA 70 mg three times a day for 12 weeks. The effects of the supplement were assessed using the 17-item Hamilton depression scale (HAMD17) and the basal levels and circadian rhythm of salivary cortisol. The study adopted them as indices because: salivary cortisol levels are high in patients with depression, their circadian rhythm related to salivary cortisol is often irregular, and these symptoms are alleviated as depression improves. The mean HAM-D17 in all subjects taking the supplement was significantly improved after 12 weeks of taking the supplement. These subjects were divided into 10 non-responders and 8 responders. The basal levels and circadian rhythm of salivary cortisol were normalized in the responders while not in non-responders. PS and omega-3 fatty acids, or other elements of the supplement, may be effective for late life depression, associated with the correction of basal levels and circadian rhythm of salivary cortisol.

Debates a controversial issue in healthcare management, that is, whether internal rotation (day‐night) or permanent night shifts is an appropriate shift system for nursing staff. A multidisciplinary approach draws together international research from the fields of occupational psychology, management, ergonomics and medicine. Explores evidence on sleep, physical and mental health, job satisfaction, performance, absenteeism, and social and domestic disruption, all important factors in considering appropriate shift patterns. Suggests that both nurse choice (or non‐choice) of shift and adjustment, or otherwise, of circadian rhythms are important causal factors influencing the debate. As no unequivocal picture emerges, recognizes some of the real and potential limitations of a paper of this kind; however, the balance of argument tends to favour the maintenance of permanent night shift nurses as opposed to the further extension of internal rotation systems. This is especially the case as many nurses will still be given a choice of shift pattern which may, in itself, negate some of the potential ill‐effects of night working. Decisions further to extend internal rotation may, in the light of the complex, ambiguous and equivocal evidence, be informed by partial knowledge and influenced by a managerial perspective.