Focus Attracts Attachment

There is growing evidence that pitch accents as well as prosodic boundaries can affect syntactic attachment. But is this an effect of their perceptual salience (the Salience Hypothesis), or is it because accents mark the position of focus (the Focus Attraction Hypothesis)? A pair of auditory comprehension experiments shows that focus position, as indicated by preceding wh-questions instead of by pitch accents, affects attachment by drawing the ambiguous phrase to the focus. This supports the Focus Attraction Hypothesis (or a pragmatic version of salience) for both these results and previous results of accents on attachment. These experiments show that information structure, as indicated with prosody or other means, influences sentence interpretation, and suggests a view on which modifiers are drawn to the most important information in a sentence

How focus particles and accents affect attachment

This project shows that focus and information structure, as indicated by the focus particle “only” and pitch accents, influence syntactic attachment, in contrast to the well-known effects of prosodic boundaries on attachment. One written questionnaire, one completion study, and several auditory questionnaires show that the position of “only” strongly affects attachment preferences in ambiguous sentences, while contrastive pitch accents have smaller effects. The two types of focus marking do not interact but independently impact attachment. These results support a modified version of the Focus Attraction Hypothesis, with ambiguous material drawn to attach to the most important information in a sentence. This research shows that information structure can affect sentence structure as well as discourse coherence

The Transportation Dividend: Transit Investments and the Massachusetts Economy

As home to America's first subway, Boston has been a transit-oriented city for more than a century. In fact, much of our regional economic success is due to the connectivity that a transit system provides. It is no coincidence that the area served by the MBTA houses almost 70 percent of the state's population, offers 74 percent of the jobs, and generates 84 percent of Massachusetts's gross domestic product. The MBTA is the backbone of our economy and any successful strategy for continued growth and prosperity for the region must begin with smart investment in this system.Luckily, the calculus is straightforward as the benefits from our transit system far outweigh the costs we dedicate to support it. A new report from A Better City, made possible through support from both the Barr Foundation and The Boston Foundation, measured the MBTA's performance and economic impact. It found that through travel time and cost savings, vehicular crashes avoided and reduced auto emissions, the MBTA provides an estimated $11.4 billion in value to Greater Boston each year for both transit users and non-users alike. Boston residents experience all of these benefits from the T's annual operating budget of approximately$2 billion.The report also considered the alternative, examining what would it cost if our transit system did not exist. Our economy would require the capital cost of nearly 2,300 additional lane miles of roads and 400,000 more parking spaces. If we needed to build that today, the cost for this vehicular infrastructure would be over $15 billion. The MBTA is a bargain today and for the future

IGF-1 Mediated Neurogenesis Involves a Novel \u3cem\u3eRIT1\u3c/em\u3e/Akt/Sox2 Cascade

Insulin-like growth factor 1 (IGF-1) is known to have diverse effects on brain structure and function, including the promotion of stem cell proliferation and neurogenesis in the adult dentate gyrus. However, the intracellular pathways downstream of the IGF-1 receptor that contribute to these diverse physiological actions remain relatively uncharacterized. Here, we demonstrate that the Ras-related GTPase, RIT1, plays a critical role in IGF-1-dependent neurogenesis. Studies in hippocampal neuronal precursor cells (HNPCs) demonstrate that IGF-1 stimulates a RIT1-dependent increase in Sox2 levels, resulting in pro-neural gene expression and increased cellular proliferation. In this novel cascade, RIT1 stimulates Akt-dependent phosphorylation of Sox2 at T118, leading to its stabilization and transcriptional activation. When compared to wild-type HNPCs, RIT1−/− HNPCs show deficient IGF-1-dependent Akt signaling and neuronal differentiation, and accordingly, Sox2-dependent hippocampal neurogenesis is significantly blunted following IGF-1 infusion in knockout (RIT1−/−) mice. Consistent with a role for RIT1 function in the modulation of activity-dependent plasticity, exercise-mediated potentiation of hippocampal neurogenesis is also diminished in RIT1−/− mice. Taken together, these data identify the previously uncharacterized IGF1-RIT1-Akt-Sox2 signaling pathway as a key component of neurogenic niche sensing, contributing to the regulation of neural stem cell homeostasis

Herbivorous Fish Populations Respond Positively to a Shipwreck Removal and Associated Alteration of Benthic Habitat

Shipwrecks can have significant localized effects when grounded on shallow coral reefs. These effects are not limited to the immediate physical damage, but can have wide-spread and lasting impacts due to alteration of the chemical makeup of the surrounding water column. This can subsequently impact the growth of benthic organisms, often leading to phase shifts and high levels of mortality of corals in the vicinity of the wreck. At Palmyra atoll, the grounding of a longline fishing vessel on the shallow reef terrace is associated with a phase shift to the corallimorph, Rhodactis howesii. In 2013, a wreck removal effort initiated by the US Department of Fish and Wildlife resulted in the successful extraction and disposal of the wreckage, after which the density and percent cover of R. howesii in the immediate vicinity of the wreck site dropped precipitously. Here, we document the response of the fish community to the wreck removal and localized decline in R. howesii. We show that the biomass of scarid parrotfishes and acanthurid surgeonfishes and unicornfishes (primarily herbivores) increased after the removal of the wreck, while biomass of chaetodontid butterflyfishes (primarily invertivores, many species are known to feed on coelenterate polyps) declined over the study period. The density of small scarids and acanthurids also increased, but only after a few years post removal. Overall these results indicate that Palmyra’s unfished herbivore population has rapidly responded to the removal of the wreck and associated decrease in corallimorph cover, can maintain high levels of grazing where space is made available for colonization of early successional algae species, and may have the potential to facilitate reef recovery

Building a Bigger Tent in Point-of-Care Ultrasound Education: A Mixed-Methods Evaluation of Interprofessional, Near-Peer Teaching of Internal Medicine Residents by Sonography Students

BACKGROUND: Point-of-care-ultrasound (POCUS) training is expanding in undergraduate and graduate medical education, but lack of trained faculty is a major barrier. Two strategies that may help mitigate this obstacle are interprofessional education (IPE) and near-peer teaching. The objective of this study was to evaluate a POCUS course in which diagnostic medical sonography (DMS) students served as near-peer teachers for internal medicine residents (IMR) learning to perform abdominal sonography. METHODS: Prior to the IPE workshop, DMS students participated in a train-the-trainer session to practice teaching and communication skills via case-based simulation. DMS students then coached first-year IMR to perform POCUS examinations of the kidney, bladder, and gallbladder on live models. A mixed-methods evaluation of the interprofessional workshop included an objective structured clinical exam (OSCE), course evaluation, and qualitative analysis of focus group interviews. RESULTS: Twenty-four of 24 (100%) IMR completed the OSCE, averaging 97.7/107 points (91.3%) (SD 5.2). Course evaluations from IMR and DMS students were globally positive. Twenty three of 24 residents (96%) and 6/6 DMS students (100%) participated in focus group interviews. Qualitative analysis identified themes related to the learning environment, scanning technique, and suggestions for improvement. IMR felt the interprofessional training fostered a positive learning environment and that the experience complimented traditional faculty-led workshops. Both groups noted the importance of establishing mutual understanding of expectations and suggested future workshops have more dedicated time for DMS student demonstration of scanning technique. CONCLUSION: An interprofessional, near-peer workshop was an effective strategy for teaching POCUS to IMR. This approach may allow broader adoption of POCUS in medical education, especially when faculty expertise is limited

Astrocyte-Specific Overexpression of Insulin-Like Growth Factor-1 Protects Hippocampal Neurons and Reduces Behavioral Deficits following Traumatic Brain Injury in Mice

Traumatic brain injury (TBI) survivors often suffer from long-lasting cognitive impairment that stems from hippocampal injury. Systemic administration of insulin-like growth factor-1 (IGF-1), a polypeptide growth factor known to play vital roles in neuronal survival, has been shown to attenuate posttraumatic cognitive and motor dysfunction. However, its neuroprotective effects in TBI have not been examined. To this end, moderate or severe contusion brain injury was induced in mice with conditional (postnatal) overexpression of IGF-1 using the controlled cortical impact (CCI) injury model. CCI brain injury produces robust reactive astrocytosis in regions of neuronal damage such as the hippocampus. We exploited this regional astrocytosis by linking expression of hIGF-1 to the astrocyte-specific glial fibrillary acidic protein (GFAP) promoter, effectively targeting IGF-1 delivery to vulnerable neurons. Following brain injury, IGF-1Tg mice exhibited a progressive increase in hippocampal IGF-1 levels which was coupled with enhanced hippocampal reactive astrocytosis and significantly greater GFAP levels relative to WT mice. IGF-1 overexpression stimulated Akt phosphorylation and reduced acute (1 and 3d) hippocampal neurodegeneration, culminating in greater neuron survival at 10d after CCI injury. Hippocampal neuroprotection achieved by IGF-1 overexpression was accompanied by improved motor and cognitive function in brain-injured mice. These data provide strong support for the therapeutic efficacy of increased brain levels of IGF-1 in the setting of TBI