1,721,056 research outputs found
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
Virtual Environments Navigation Assessment (VIENNA) in older adults
No full textDie Fähigkeit zur räumlichen Navigation ist bei neurologischen Erkrankungen häufig beeinträchtigt und nimmt auch mit zunehmendem Alter ab. Forscher und Kliniker benötigen daher valide und einfach zu handhabende Instrumente zur Bewertung der räumlichen Navigation, um die Auswirkungen verschiedener Neuropathologien zu untersuchen und zu verhindern, dass relevante kognitive Beeinträchtigungen unerkannt bleiben. Derzeitige experimentelle Paradigmen gehen jedoch nur selten darauf ein, welche kognitiven Prozesse sie abfragen, haben oft einen ressourcenintensiven Aufbau und erfordern in der Regel eine aktive Navigation, z. B. mit einem Joystick oder einer Tastatur, wodurch die kognitive Leistung durch feinmotorische Fähigkeiten beeinträchtigt wird. Für die klinische Durchführbarkeit werden jedoch effiziente Paradigmen benötigt, die informativ und bei Teilnehmern mit begrenzter technischer Erfahrung und unterschiedlichen Beeinträchtigungen einfach zu handhaben sind.
Wir stellen hier das Virtual Environments Navigation Assessment (VIENNA) vor, eine virtuelle Adaptation eines kurzen, standardisierten und intuitiven räumlichen Navigationsparadigmas (https://osf.io/kp4c5/). VIENNA wurde entwickelt, um die räumliche Navigation ohne Anforderungen an das episodische Gedächtnis zu beurteilen, und erfordert keine Verwendung von Schnittstellengeräten. Wir untersuchten VIENNA bei 79 gesunden Teilnehmern mittleren bis höheren Alters (50-85 Jahre) und lieferten Belege für seine Durchführbarkeit und Konstruktvalidität. Tests der visuell-räumlichen und exekutiven Funktionen, nicht aber des episodischen Gedächtnisses oder der selektiven Aufmerksamkeit, wurden als kognitive Korrelate von VIENNA identifiziert, selbst wenn man das Alter der Teilnehmer und die kognitive Gesamtleistung berücksichtigt. Außerdem korrelierten die VIENNA-Werte mit der subjektiven Navigationsfähigkeit und dem Alter, nicht aber mit Depressivität, kognitiven Beschwerden oder Bildung. Die einfache Handhabung von VIENNA erlaubt die Integration in neuropsychologische Routineuntersuchungen und ermöglicht eine differenzierte Bewertung der räumlichen Navigationsleistung bei Patienten mit motorischen Beeinträchtigungen und Defiziten des episodischen Gedächtnisses.Spatial navigation abilities are frequently impaired in neurological disorders and they also decline with normal aging. Researchers and clinicians therefore need valid and easy-to-use spatial navigation assessment tools to study the impact of different neuropathologies and prevent relevant cognitive impairments from going undetected. However, current experimental paradigms rarely address which cognitive processes they recruit, often have resource intensive set-ups, and usually require active navigation, e.g., using joystick or keyboard, thus confounding cognitive performance with fine motor skills. Yet, for clinical feasibility, time-efficient paradigms are needed that are informative and easy to administer in participants with limited technical experience and diverging impairments.
Here, we introduce the virtual environments navigation assessment (VIENNA), a virtual adaptation of a brief, standardized, and intuitive spatial navigation paradigm (https://osf.io/kp4c5/). VIENNA is designed to assess spatial navigation without episodic memory demands and requires no interface device. We evaluated VIENNA in 79 healthy middle-aged to older participants (50–85 years) and provide evidence for its feasibility and construct validity. Tests of visuospatial and executive functions, but not episodic memory or selective attention were identified as cognitive correlates of VIENNA, even when controlling for participant age and overall cognitive performance. Furthermore, VIENNA scores correlated with subjective navigation ability and age, but not with depressiveness, cognitive complaints, or education. The straightforward administration of VIENNA allows for its integration into routine neuropsychological assessments and enables differentiated evaluation of spatial navigation performance in patients with motor impairments and episodic memory deficits
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
Accumulation processes of time, space and numerosity : an fMRI study
Full text linkThe underlying neuronal processes of the perception of time, space and other magnitudes
are subject to intense scientific debate. Furthermore, mutual interactions between
the perception of different dimensions are widely reported, but the origin of such crossdimensional
interference effects is still not well understood. This thesis investigates time,
space and numerosity judgements as well as their cross-dimensional influence on a behavioural
and neuronal level within a navigational context. Participants underwent fMRI
imaging while being passively moved forward along a virtual path that was covered with
randomly appearing dots. After each trial, participants were asked to make judgements
about the trial duration, distance covered or numerosity of items on the floor, allowing for
a simultaneous observation of behavioural and neuronal effects.
Behavioural results revealed a correlation between time and space judgement precision as
well as a bidirectional interference only between these two dimensions, but not for numerosity.
Analyses of the neuroimaging data identified the right IFG as a commonly activated area
during the perception of all three dimensions and MT/V5 bilaterally as being uniquely activated
during numerosity trials. Mirroring the behavioural results, activation patterns of
time and space trials were indistinguishable by MVPA but could be decoded from numerosity
trials, predominantly in MT/V5 as well as in the IPS bilaterally (time vs. numerosity).
The findings suggest that the interference between travel time and traveled distance could
be mediated by neuronal computations of movement speed on the basis of visual optic
flow information. Furthermore, the results add to the body of evidence that the crossdimensional
interference effects between time and space are based on overlapping neuronal
representations
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
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