1,720,993 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
Frontal lobe syndrome or adolescent-onset schizofrenia? A case report.
No full textOBJECTIVE: To highlight the difficulties that abound in making a clinical distinction between early-onset schizophrenia (EOS) and juvenile frontal dementia early in the course of illness. METHOD: Clinical information and data from investigations in single case was collated and reviewed. RESULTS: A 15-year-old girl was admitted to our psychiatric unit because of cognitive decline and formal thought disorder with echopraxia, echolalia and palilalia, and a lack of flexibility in the use of cognitive and motor strategies that culminated in psychosis. A single photon emission computerized tomography scan showed marked frontal lobe hypoperfusion; however, on proton spectroscopy there was no differential in N-acetyl aspartate levels. CONCLUSION: Hypofrontality in EOS is well established and the association of frontal functional alterations, neuropsychological impairment and psychotic symptomatology is suggestive of frontal lobe prodrome that precedes the onset of psychosis
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
Integrating morphology and molecular data to explore taxonomy, evolutionary history and conservation of Italian endemic Forficulidae (Dermaptera)
Full text linkItaly hosts 27 species of Dermaptera, five belonging to Forficula, which were never thoroughly investigated. We integrated morphological (morphometric measurements) and molecular data (mitochondrial COI, 16S and nuclear 28S, ITS2) to revise the Italian species, focusing on the endemic taxa, and on the diversity within F. auricularia to reveal the presence of cryptic species. Our data were integrated with those available for other West Mediterranean Forficula. Our results confirmed the taxonomic status of the endemic F. apennina and F. silana, that belong to different lineages but share some morphological traits. The endemic Pseudochelidura orsinii and P.galvagnii resulted nested within Forficula, and a new taxonomic arrangement is proposed (Forficula orsinii: resurrected combination and Forficula galvagnii: new combination). Molecular data revealed the presence in Pantelleria and Sardinia of F. mediterranea, cryptic with F.auricularia and reported only from Spain and Morocco. Morphometric data showed a distinction between West Mediterranean and Italian specimens of F. mediterranea, indicating a divergent selection within this species. This study provides new insights for the Italian Forficulidae, highlighting the importance of combining different approaches in the study of species diversity for their conservation. Indeed, F.apennina and F. galvagnii are high altitude species which seem to be affected by global warming so much to raise fears for their conservatio
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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