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Prevailing Level (prevailing + level)
Selected AbstractsNonergodic Corruption Dynamics (or, Why Do Some Regions within a Country Become More Corrupt than Others?)JOURNAL OF PUBLIC ECONOMIC THEORY, Issue 2 2006RANDAL J. VERBRUGGE Two key aspects of corruption are strategic complementarity (the greater the prevailing level of corruption, the more likely is a particular agent to engage in it) and localized interactions (officials typically interact repeatedly with a small group of other officials, their colleagues). This paper builds a simple model with these two features, which studies the evolution of corruption. Over time, local networks of corruption (or honest behavior) endogenously emerge, and otherwise identical regions can end up with divergent corruption levels. Anti-corruption policies are studied. [source] Oscillatory nature of human basal ganglia activity: Relationship to the pathophysiology of Parkinson's diseaseMOVEMENT DISORDERS, Issue 4 2003Peter Brown MD Abstract Alterations of basal ganglia physiology in parkinsonism may consist of two elements, an increase in the firing rate of neurones and a change in the pattern of synchronisation of discharges between neurones. Recent findings suggest the presence of two principal modes of synchronised activity within the human subthalamo-pallidal-thalamo-cortical circuit, at <30 Hz and >60 Hz. These oscillations are dynamically and systematically modulated by task, thereby suggesting a functional role in movement. More importantly, the two frequency modes are inversely affected by movement, consistent with opposing actions, and differentially expressed according to the prevailing level of dopaminergic activity. It is argued that the balance between these modes determines the effects of basal ganglia-thalamocortical projections on the motor areas of the cortex. The lower frequency oscillations facilitate slow idling rhythms in the motor areas of the cortex, whereas synchronisation at high frequency restores dynamic task-related cortical ensemble activity in the gamma band.© 2002 Movement Disorder Society [source] Health of the nation: an individual or a corporate social responsibility?JOURNAL OF PUBLIC AFFAIRS, Issue 2 2007A preliminary investigation into consumer perceptions Britain is increasingly mirroring a number of nations in terms of the continued growth in prevailing levels of illnesses related potentially to human food consumption. As this issue fast becomes global, the question of whose responsibility it is, has come to the forefront of the debate. Other groups, apart from the Governments with direct involvement in this crisis are the Consumers and the Marketers. Using the food industry as the basis, the study primarily focuses on the consumers' perceptions of the nature and the extent of the problem. To investigate, three products used in the study are placed on a continuum; Chocolates represent one end and Genetically manufactured foods the other. Fast foods are represented in the middle. This framework highlights variations in consumer perceptions based on product differences: manufacturers have been held responsible for the provision of pertinent information in the case of genetically manufactured products; in the context of fast foods and Confectionery both manufacturers and consumers have been seen as responsible for consumers' existing consumption patterns. Copyright © 2007 John Wiley & Sons, Ltd. [source] Sperm transfer through forced matings and its evolutionary implications in natural guppy (Poecilia reticulata ) populationsBIOLOGICAL JOURNAL OF THE LINNEAN SOCIETY, Issue 4 2003JONATHAN P. EVANS In species in which individuals alternate between mating strategies, males may respond to elevated predation risk by switching from conspicuous courtship displays to less risky or more profitable sneaky mating attempts. As a consequence, in such species female choice is likely to be undermined more frequently in relatively dangerous localities. We tested this prediction using the guppy, a species of fish in which individual males alternate between courtship (solicited) and forced (unsolicited) copulations according to prevailing levels of predation. We collected females at late stages of gestation from four high- and four low-predation populations in Trinidad and examined them for the presence of sperm in their gonoducts. Due to the patterns of sperm storage in guppies, sperm found in the gonoducts of such late-cycle females can only arise from unsolicited copulations. We anticipated that because female guppies are subject to greater sexual harassment in the form of forced mating attempts in high-risk localities, a higher proportion of females in these populations would contain sperm in their gonoducts arising from recent unsolicited copulations. Contrary to this prediction, only one of the four paired comparisons (from the Quaré River) revealed a significant difference in the proportion of females recently inseminated through forced copulations. The paired comparisons for the remaining three rivers revealed no significant differences in the proportion of females with recoverable sperm in their gonoducts. However, overall, we found that 44.5% (±4.3 SE) of females had sperm in their gonoduct arising from sneaky mating, a figure three times higher than previously reported for this species. We discuss these findings in relation to recent predictions concerning the strength of sexual selection in natural populations. © 2003 The Linnean Society of London, Biological Journal of the Linnean Society , 2003, 78, 605,612. [source] | ||||||||||