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Auditory cortical responses in patients with cochlear implants
No full textCurrently the electrophysiological tests mostly used for cochlear implant evaluations are AEV, EABR and NRT. In this paper the Authors focus their interest on the study of the acoustic auditory cortical responses, or slow vertex responses (SVRs), that generally do not find large application due to the difficulty in recording especially in young children. The goals of this study consist in the verification of SVRs value and possible applications, in particular in monitoring the postimplant results considering the effective hearing restoration and auditory maturation. In practice, the use of tone-bursts even through the hearing aids as in SVRs, allows to evaluate much more frequencies and louder intensities than the other tests with a click as stimulus. Study design: Latencies of N1 and P2 SVR peaks were studied in cochlear implantees. Materials & Methods: Forty five implant recipients (aged 2 to 70 yr) were divided into five different homogeneous groups according to their chronological age, the age at the onset of deafness, and the age at implantation. For each subject, SVRs and free field auditory responses (PTAs) were recorded for tone-bursts at 500 and 2000 Hz before cochlear implant surgery (using hearing aid amplification) and during scheduled sessions at the 3rd and 12th month after implant activation. Results: N1 and P2 latencies decreased for all groups from the 3rd to the 12th mo after activation. Subjects implanted before school age or at least before age 8 yr exhibited the greatest latency change. For all subjects, a reduction of the gap between subjective thresholds (obtained with PTA) and objective thresholds (obtained with SVRs) measured with cochlear implant in comparison to those obtained in the presurgery stage with hearing aids was observed. Conclusions: A natural activation of the auditory pathway along the time especially in young children with prelingual deafness and implanted in preschool age was found. In any case cochlear implant seems to provide a real hearing restoration that is demonstrated by the sharp reducing of the gap between PTA and SVRs threshold
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
Documento del Gruppo S.I.O. Impianti Cocleari: Linee Guida per l’applicazione dell’Impianto Cocleare e la gestione del centro Impianti Cocleari
No full textAppropriate 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
Distribuzione di potenziali elettrici generati in impianti cocleari in tessuti biologici: misure sperimentali in vitro
No full textExperimental measurement of waveform parameters of electrode current pulses in cochlear implants
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