1,720,956 research outputs found
Nonfocal symptoms of cerebral small vessel disease
Full text linkCerebral small vessel disease (SVD) is highly prevalent in the general
population, increases with advancing age, and is a common cause of stroke
and dementia. SVD affects multiple clinical domains and manifests on
neuroimaging primarily as white matter hyperintensities (WMH), subcortical
infarcts, lacunes, perivascular spaces, and microbleeds. Apart from stroke and
dementia, SVD was previously thought to be clinically ‘silent’ but it is becoming
apparent from cross-sectional studies that SVD is accompanied by
neuropsychiatric, cognitive, and gait symptoms that do not meet the current
clinical lexicon for stroke or dementia. Identifying earlier clinical markers of
brain damage is essential for identifying patients for SVD treatment trials. We
aimed to track and characterise whether subtle nonfocal symptoms are
longitudinally associated with SVD lesion progression on brain MRI.
We conducted a literature review of all SVD clinical features and a systematic
review and meta-analysis of SVD-associated neuropsychiatric and cognitive
features. We recruited patients with recent non-disabling ischaemic stroke,
performed diagnostic MRI, and questioned participants and informants about
neuropsychiatric, cognitive and gait symptoms. We repeated MRI and
subjective symptom assessments at 3-6 monthly intervals for 12 months,
longitudinally assessing WMH volume change and incident infarcts. We also
analysed combined functional and cognitive associations with SVD
progression in a separate stroke population. Finally, we assessed
neuropsychiatric symptom-lesion associations in cognitively impaired and
older adult populations.
In our systematic review and meta-analysis, we found small but important
associations between SVD severity and apathy, fatigue, and delirium, but not
with subjective memory complaints, while anxiety and other neuropsychiatric
symptoms were inconclusive. In 203 patients followed up for one year after a
stroke (55% lacunar/45% cortical), we found that incident infarcts occur in 20%
of patients, are mostly subcortical, co-associate with depression and brain fog,
and there were trends towards associations with fatigue, falls, unsteadiness,
episodes of confusion, and informant-reported cognitive and functional
decline. We identified that that worse baseline WMH are associated with falls,
apathy and brain fog, worse six-month WMH with falls and unsteadiness, and
worse 12-month WMH with a trend towards falls. We found that longitudinal
WMH progression is associated with falls and brain fog, with trends towards
associations with worsening informant-reported neuropsychiatric symptoms
and subjective memory complaints. In 264 separate stroke patients, we
identified that one-year, but not baseline, WMH volumes associate strongly
with contemporaneous cognitive scores, and co-varying longitudinal
worsening of cognition and function post-stroke is associated with increasing
WMH volumes. We found that worsening neuropsychiatric symptoms are
associated with WMH progression in a cognitively impaired population. We
established that in an older population, apathy independently associates with
longitudinal WMH progression, while depression, anxiety, and subjective
memory complaints do not.
Overall, these findings highlight the existence of a potential clinical syndrome
for identifying future SVD progression in high-risk patients. SVD progression
is dynamic and can progress rapidly. These results support a need to clarify
the prevalence of the SVD syndrome in the general population and to develop
clinical prediction models to guide whether treatments could be trialled in
individuals who are at high risk for SVD progression
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
Author Under Sail The Imagination of Jack London, 1893-1902
No full textIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Intro -- Title Page -- Copyright Page -- Dedication -- Contents -- Acknowledgments -- Introduction -- 1. Spirit Truth -- 2. From Absorption to Theatricality and Back Again -- 3. "I Will Build a New Present" -- 4. Sons as Authors -- 5. Fathers as Publishers -- 6. The Daughter as Author -- 7. Lovers as Authors -- 8. At Sea with the Family -- 9. Yellow News, Yellow Stories -- 10. The Return Home -- Notes -- Bibliography -- Index -- About Jay WilliamsIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Description based on publisher supplied metadata and other sources.Electronic reproduction. Ann Arbor, Michigan : ProQuest Ebook Central, YYYY. Available via World Wide Web. Access may be limited to ProQuest Ebook Central affiliated libraries
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