1,720,972 research outputs found
Combined Behavioral and EEG Power Analysis in Diffuse Axonal Injury Improve Accuracy In The Assessment of Sustained Attention Deficits
No full textIn clinical routine, the evaluation of sustained
attention is often performed by analyzing the behavioral
data collected during specific tests. Such analyses are rarely
accompanied by a detailed examination of the subject’s
simultaneous electroencephalographic (EEG) activity, and
particularly its frequency content. In this study, a group of
healthy volunteers and a group of patients affected by
diffuse axonal injury (DAI) were tested while performing a
modified version of the Conners’ continuous performance
test. A comparative study was carried out between the
behavioral and neuropsychological data obtained during the
task, to investigate neural activation. Spectral power was
calculated for each of the recorded EEG signals, taking
account of the frequency bands traditionally considered in
literature. Then a compressed spectral array sequence of
spectra was plotted to put into evidence the temporal
modifications in the signal power spectral density, and,
finally, the analysis of the rhythm variability was carried out.
Evaluation of the results thus obtained shows that the two
groups registered very different cerebral activation dynamics
during the ongoing attentional task. Moreover, DAI patients
showed mild cortical activation in the prefrontal region,
spread equally throughout both brain hemispheres, while
controls showed strong predominant activation of the right
prefrontal area. Our findings encourage further investigations
of the combined employment of tests and EEG
recordings during the clinical assessment of sustained attention
performance
Automatic Recognition of Hemodynamic Responses to Rare Stimuli using Functional Near-Infrared Spectroscopy
No full text
Analisi multimodale delle funzionalita’ del sistema nervoso centrale durante protocolli di attenzione sostenuta
No full textApplying 2D ML Iterative Reconstruction Methods with Resolution Recovery to 3D PET Data: Evaluation of Rebinning Effects
No full text
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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