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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
SELECTIVE EMOTION PROCESSING IN THE VISUAL BRAIN: THE NEAR ABSENCE OF HABITUATION
No full textRecent studies support the hypothesis that emotional stimuli draw attentional
resources. Specifically, emotional images elicit augmented negative amplitudes over
occipito-temporal regions (early posterior negativity, EPN) around 150 ms after
stimulus onset, most apparent between 200 and 300 ms. Accordingly, it was
explored in this study whether the selective processing of emotional cues is an
obligatory phenomenon that does not habituate. Pleasant, neutral, and unpleasant
pictures were presented for 330 ms without perceivable interstimulus interval. The
picture set was repeated 90 times amounting to a total of 3600 picture
presentations. The EEG was collected continuously with a 129 dense sensor array
during passive picture viewing. Replicating previous results, emotional contents
were associated with significantly augmented EPN amplitudes over temporooccipital
sites. Of most interest, emotional modulation was similarly expressed for
the first and last block of picture presentation. The present findings demonstrate the
near absence of habituation of the selective attention devoted to emotionally
significant stimuli during perceptual processing. These findings contrast with the
rapid habituation that can be observed for autonomic indices of emotional
processing. Accordingly, it appears that habituation changes the networks that
regulate the organization of the emotional response output, but that those networks
responsible for the detection of emotional significant stimuli in environment are not
altered by habituation, and might therefore be an obligatory response
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
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