African elephants can use human pointing cues to find hidden food

We thank the School of Psychology and Neuroscience of the University of St Andrews for providing the funding for this research.How animals gain information from attending to the behavior of others has been widely studied, driven partly by the importance of referential pointing in human cognitive development [1, 2, 3 and 4], but species differences in reading human social cues remain unexplained. One explanation is that this capacity evolved during domestication [5 and 6], but it may be that only those animals able to interpret human-like social cues were successfully domesticated. Elephants are a critical taxon for this question: despite their longstanding use by humans, they have never been domesticated [7]. Here we show that a group of 11 captive African elephants, seven of them significantly as individuals, could interpret human pointing to find hidden food. We suggest that success was not due to prior training or extensive learning opportunities. Elephants successfully interpreted pointing when the experimenter’s proximity to the hiding place was varied and when the ostensive pointing gesture was visually subtle, suggesting that they understood the experimenter’s communicative intent. The elephant’s native ability in interpreting social cues may have contributed to its long history of effective use by man.PostprintPeer reviewe

The Singing Insects of Michigan

Excerpt: The so-called singing insects are all those that make loud, rhythmical noises. They include members of three groups of Orthoptera (Gryllidae, Tettigoniidae, and Acridoidea) and one family of Homoptera (Cicadidae). There are about 300 noisy species in these four groups in eastern North America, perhaps a thousand in all of North America, and 25-30 thousand in the entire world. Only about 1000 of the world species have been studied in any detail, mostly in North America, Europe, Japan, and Australia

"We muddle our way through": shared and distributed expertise in digital engagement with research

The use and availability of digital media is changing researchers' roles and simultaneously providing a route for a more engaging relationship with stakeholders throughout the research process. Although the digital realm has a profound influence on people's day-to-day lives, some researchers have not yet professionally embraced digital technologies. This paper arises from one aspect of a project exploring how university research and professional practices are evolving as researchers engage with stakeholders via digital media to create, share and represent knowledge together. Using researchers from the Open University (U.K.) as a case study, this paper reviews the extent to which they are developing multiple identities and functions in their engaged research through digital media

Is Accurate Understanding of Global Warming Necessary to Promote Willingness to Sacrifice?

Although not definitive, the authors\u27 study suggests potential benefits from having a general public better informed about global climate change. They find, e.g., that accurate information appears to increase willingness to accept personal sacrifice

Are School Superintendents Rewarded for “Performance”?

[Excerpt] This chapter presents analyses of the compensation and mobility of school superintendents in New York State during the 1978-79 to 1982-83 period. The focus is on school superintendents because they are the chief operating officers of school districts, their salaries are determined through individual negotiations with school boards, and their salary data were made available to us. In contrast, school principals\u27 salary data were not available to us. Especially in large districts, principals tend to be members of a union and their salary increases negotiated collectively, which limits the likelihood of observing individual principals\u27 salaries being related to measures of their school\u27s performance

Trade, standards, and the political economy of genetically modified food

A common-agency lobbying model is developed to help understand why North America and the European Union have adopted such different policies toward genetically modified (GM) food. Results show that when firms (in this case farmers) lobby policy makers to influence standards and consumers and environmentalists care about the choice of standard, it is possible that increased competition from abroad can lead to strategic incentives to raise standards, not just lower them as shown in earlier models. We show that differences in comparative advantage in the adoption of GM crops may be sufficient to explain the trans-Atlantic difference in GM policies. On the one hand, farmers in a country with a comparative advantage in GM technology can gain a strategic cost advantage by lobbying for lax controls on GM production and usage at home and abroad. On the other hand, when faced with greater competition, the optimal response of farmers in countries with a comparative disadvantage in GM adoption may be to lobby for more-stringent GM standards. Thus it is rational for producers in the EU (whose relatively small farms would enjoy less gains from the new biotechnology than broad-acre American farms) to reject GM technologies if that enables them and/or consumer and environmental lobbyists to argue for restraints on imports from GM-adopting countries. This theoretical proposition is supported by numerical results from a global general equilibrium model of GM adoption in America without and with an EU moratorium.Agricultural Knowledge&Information Systems,Environmental Economics&Policies,Economic Theory&Research,Labor Policies,Health Economics&Finance,Environmental Economics&Policies,Economic Theory&Research,Agricultural Knowledge&Information Systems,Crops&Crop Management Systems,Health Economics&Finance

Trade, Standards, and the Political Economy of Genetically Modified Food

A common-agency lobbying model is developed to help understand why North America and the European Union have adopted such different policies towards genetically modified food. Our results show that when firms (in this case farmers) lobby policy makers to influence standards and consumers and environmentalists care about the choice of standard, it is possible that increased competition from abroad can lead to strategic incentives to raise standards, not just lower them as shown in earlier models. This theoretical proposition is supported by numerical results from a global general equilibrium model of GM adoption in America without and with an EU moratorium.GMOs, political economy, regulation of standards, trade policy.

Republican States Bolstered Their Health Insurance Rate Review Programs Using Incentives From the Affordable Care Act.

The Affordable Care Act (ACA) included financial and regulatory incentives and goals for states to bolster their health insurance rate review programs, increase their anticipated loss ratio requirements, expand Medicaid, and establish state-based exchanges. We grouped states by political party control and compared their reactions across these policy goals. To identify changes in states rate review programs and anticipated loss ratio requirements in the individual and small group markets since the ACAs enactment, we conducted legal research and contacted each states insurance regulator. We linked rate review program changes to the Centers for Medicare and Medicaid Services (CMS) criteria for an effective rate review program. We found, of states that did not meet CMSs criteria when the ACA was enacted, most made changes to meet those criteria, including Republican-controlled states, which generally oppose the ACA. This finding is likely the result of the relatively low administrative burden associated with reviewing health insurance rates and the fact that doing so prevents federal intervention in rate review. However, Republican-controlled states were less likely than non-Republican-controlled states to increase their anticipated loss ratio requirements to align with the federal retrospective medical loss ratio requirement, expand Medicaid, and establish state-based exchanges, because of their general opposition to the ACA. We conclude that federal incentives for states to strengthen their health insurance rate review programs were more effective than the incentives for states to adopt other insurance-related policy goals of the ACA

Harmonic analysis of lossy piezoelectric composite transducers using the plane wave expansion method

Periodic composite ultrasonic transducers oer many advantages but the periodic pillar architecture can give rise to unwanted modes of vibration which interfere with the piston like motion of the fundamental thickness mode. In this paper, viscoelastic loss is incorporated into a three dimensional plane wave expansion model (PWE) of these transducers. A comparison with experimental and nite element data is conducted and a design to damp out these lateral modes is investigated. Scaling and regularisation techniques are introduced to the PWE method to reduceill-conditioning in the large matrices which can arise. The identication of the modes of vibration is aided by examining proles of the displacements, electrical potentialand Poynting vector. The dispersive behaviour of a 2-2 composite transducer with high shear attenuation in the passive phase is examined. The model shows thatthe use of a high shear attenuation ller material improves the frequency band gap surrounding the fundamental thickness mode