The role of gesture delay in coda /r/ weakening: an articulatory, auditory and acoustic study

The cross-linguistic tendency of coda consonants to weaken, vocalize, or be deleted is shown to have a phonetic basis, resulting from gesture reduction, or variation in gesture timing. This study investigates the effects of the timing of the anterior tongue gesture for coda /r/ on acoustics and perceived strength of rhoticity, making use of two sociolects of Central Scotland (working- and middle-class) where coda /r/ is weakening and strengthening, respectively. Previous articulatory analysis revealed a strong tendency for these sociolects to use different coda /r/ tongue configurations—working- and middle-class speakers tend to use tip/front raised and bunched variants, respectively; however, this finding does not explain working-class /r/ weakening. A correlational analysis in the current study showed a robust relationship between anterior lingual gesture timing, F3, and percept of rhoticity. A linear mixed effects regression analysis showed that both speaker social class and linguistic factors (word structure and the checked/unchecked status of the prerhotic vowel) had significant effects on tongue gesture timing and formant values. This study provides further evidence that gesture delay can be a phonetic mechanism for coda rhotic weakening and apparent loss, but social class emerges as the dominant factor driving lingual gesture timing variation

Neural Correlates of Swimming Behavior in Melibe leonina

The nudibranch Melibe leonina swims by rhythmically bending from side to side at a frequency of 1 cycle every 2–4 s. The objective of this study was to locate putative swim motoneurons (pSMNs) that drive these lateral flexions and determine if swimming in this species is produced by a swim central pattern generator (sCPG). In the first set of experiments, intracellular recordings were obtained from pSMNs in semi-intact, swimming animals. About 10–14 pSMNs were identified on the dorsal surface of each pedal ganglion and 4–7 on the ventral side. In general, the pSMNs in a given pedal ganglion fired synchronously and caused the animal to flex in that direction, whereas the pSMNs in the opposite pedal ganglion fired in anti-phase. When swimming stopped, so did rhythmic pSMN bursting; when swimming commenced, pSMNs resumed bursting. In the second series of experiments, intracellular recordings were obtained from pSMNs in isolated brains that spontaneously expressed the swim motor program. The pattern of activity recorded from pSMNs in isolated brains was very similar to the bursting pattern obtained from the same pSMNs in semi-intact animals, indicating that the sCPG can produce the swim rhythm in the absence of sensory feedback. Exposing the brain to light or cutting the pedal-pedal connectives inhibited fictive swimming in the isolated brain. The pSMNs do not appear to participate in the sCPG. Rather, they received rhythmic excitatory and inhibitory synaptic input from interneurons that probably comprise the sCPG circuit

Markets for ecosystem services: Applying the concepts

In recent times, use of market-based instruments to facilitate enhanced protection or production of ecosystem services has achieved a high public profile. However, much work remains to apply these tools in practice. Particular issues include definition and measurement of ecosystem services, development of institutions and mechanisms to facilitate trade and integration of these instruments into the broader natural resource management agenda and toolbox. In this paper these issues are explored with respect to pilot markets for ecosystem services in three case study catchments. Emphasis is placed on pilot selection rationale and identification of key facilitative mechanisms and institutions.Research Methods/ Statistical Methods,

Magnetic Braking and Viscous Damping of Differential Rotation in Cylindrical Stars

Differential rotation in stars generates toroidal magnetic fields whenever an initial seed poloidal field is present. The resulting magnetic stresses, along with viscosity, drive the star toward uniform rotation. This magnetic braking has important dynamical consequences in many astrophysical contexts. For example, merging binary neutron stars can form "hypermassive" remnants supported against collapse by differential rotation. The removal of this support by magnetic braking induces radial fluid motion, which can lead to delayed collapse of the remnant to a black hole. We explore the effects of magnetic braking and viscosity on the structure of a differentially rotating, compressible star, generalizing our earlier calculations for incompressible configurations. The star is idealized as a differentially rotating, infinite cylinder supported initially by a polytropic equation of state. The gas is assumed to be infinitely conducting and our calculations are performed in Newtonian gravitation. Though highly idealized, our model allows for the incorporation of magnetic fields, viscosity, compressibility, and shocks with minimal computational resources in a 1+1 dimensional Lagrangian MHD code. Our evolution calculations show that magnetic braking can lead to significant structural changes in a star, including quasistatic contraction of the core and ejection of matter in the outermost regions to form a wind or an ambient disk. These calculations serve as a prelude and a guide to more realistic MHD simulations in full 3+1 general relativity.Comment: 20 pages, 19 figures, 3 tables, AASTeX, accepted by Ap

Delimiting the Culture Defense

This essay builds upon the arguments of Alison Dundes Renteln in her influential book, The Cultural Defense (2004), in which she argues persuasively for a uniformly recognized culture defense in certain litigations. Critiquing some of her details, we recast her three-prong culture defense test to more effectively balance the competing interests of minority culture members to have their ways of life taken seriously by the courts, and of members of the dominant tradition who wish to preserve the rule of law with its necessary perception as treating all parties equally. The offered formulation now includes the following five elements: 1. Is the litigant an enculturated member of the referenced group? 2. Does the group have an acknowledged tradition as that claimed by the litigant? 3. Is that tradition expected to contribute to the fostering of positive social bonds within the culture group? 4. Was the litigant influenced by that tradition when he or she acted? 5. Were the circumstances of the litigant such that he or she could be reasonably presumed to be unaware of the contrary normative standards of the dominant society

Can infant vaccination prevent pneumococcal meningitis outbreaks in sub-Saharan Africa?

: The WHO Strategic Advisory Group of Experts is reviewing the technical evidence to inform policy on optimal use of infant pneumococcal conjugate vaccines (PCV)(1). Since 2010, multivalent vaccines (PCV-10, PCV-13) have been successfully introduced with the support of Gavi the Vaccine Alliance into infant immunisation programmes across the developing world(2). One recommended schedule consists of three doses under the age of 6 months (3+0), with the aim of providing maximum protection to infants, the age group at highest risk of pneumococcal disease(3). An alternative schedule consists of two vaccine doses under the age of six months with a booster at 9-15 months (2+1). This schedule may have more impact on reducing carriage and transmission of vaccine serotypes to unvaccinated individuals, leading to indirect or herd protection. The question around the most cost-effective policy to achieve both direct and indirect protection has particular importance for the meningitis belt of sub-Saharan Africa. This article is protected by copyright. All rights reserved.<br/

Impact of serogroup A meningococcal conjugate vaccine for Africa.

The introduction of a serogroup A meningococcal conjugate vaccine in the African meningitis belt has been a remarkable success. Meningitis due to the serogroup A meningococcus, previously responsible for most epidemics, has fallen by 99% in vaccinated countries. Success must, however, not distract from the continuing burden of meningitis in this region of Africa. The number of all meningitis epidemics at health district level has fallen by 60% following vaccination, but epidemics due to other meningococcal serogroups continue and may be increasing. The introduction of low cost multivalent conjugate vaccines must be given high public health priority

Increasing Hospital Admissions for Pneumonia, England

This rise in recorded incidence from 2001 to 2005 was particularly marked among the elderly