1,720,967 research outputs found
EyeLab: a user-friendly Matlab tool for real-time monitoring of eye movements
No full textDespite the advantages of objective analysis of oculomotor behaviour and the continuous progresses in eye-tracking technologies, eye-movement studies are likely confined to research laboratories and seldom applied in the clinical practice. The neurologist's expertise in reading the traces from eye-trackers, along with the specialized technical knowledge required to manage, program and use such tools, hampered their widespread adoption. Recently, many open-source software tools have been developed to expand the usability of eye tracking systems to study oculomotor functioning, but none of these allows the experimenter to simultaneously control the trial and visualize and monitor eye movements in real-time. In this work, we present EyeLab, a new MATLAB graphical user interface developed for the analysis of both saccadic and smooth pursuit eye movements while using the video-based Eye Link II eye-tracker by SR Research. Developed by exploiting the Psychophysics Toolbox, it extends the functionalities of EyeLink II by introducing and managing an intuitive real-time monitoring user-friendly interface on a third screen, which also allows personalizing the experimental procedure and managing data acquisition, visualization, processing, and storage, without requiring programming skills to the user. The real-time features enable the prompt adaptation of the experimental protocol to the ongoing results and the correction of any setup problem that could affect the correct acquisition of a whole set of tests
SECOND TRIMESTER PLACENTAL BIOPSY VERSUS AMNIOCENTESIS FOR PRENATAL DIAGNOSIS OF B-THALASSEMIA.(LETTER)
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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
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