1,721,034 research outputs found
Update sulla diagnostica audiologica e misure di outcome in infanzia
Full text linkUpdate sulla diagnostica audiologica e misure di outcome in infanzia.
E’ noto da anni che il bambino ipoacusico può essere diagnostica fin dai primi giorni di vita e questo pone l’attenzione all’accuratezza delle procedure diagnostiche di audiologia infantile, Nel corso di questo intervento sarà spiegato il percorso standard della valutazione audiologica infantile che permette la scelta terapeutica e saranno descritti i criteri attuati nella scelta di proporre un impianto cocleare. Sarà altresì dato spazio a quelle procedure diagnostiche in ambito di audiometria protesica che sono meno note e di recente sviluppo, quali il dichotic digit test e l’audiometria con risposte motorie
Vestibular Electrical Stimulation
No full textPeripheral proprioceptors of the muscles and the joints have a feedback control on the vestibular nuclei through the spino-vestibular pathways. Neuromuscular spindles and Golgi receptors are dynamometers and they are particularly sensitive to variations in muscle length and tension. Joint receptors, Ruffini and Golgi bodies, give information regarding the position of a joint and its movement. The portion of the neck including the first three vertebrae is particularly involved during the major part of everyday head movements [1, 2]
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
Fine-grain Study: initial results
No full textPurpose of the study: Auditory percept resulting from stimulation with continuous intensity growth (“fine-grain”) at single stimulation electrodes was analysed. Starting from 0 qu up to the loudest acceptable presentation level (LAPL), stimulation intensity was continuously increased with 1 qu per second (1qu~nano Coulomb). Stimuli were presented in three runs: two continuous growth stimulations at rates of 40 and 80Hz, as well as a growth using larger steps (~1-1.5qu).During the delivery of the stimuli, the threshold of electrical elicitation of the stapedius reflex (eSRT) was monitored and the evoked compound action potentials (ECAPs) were recorded. Materials and Methods used: In earlier analysis of the continuous stimulation growth with larger with different charge steps (44Hz vs 80Hz) a difference in LAPL was observed: Lutz et al [2015] showed that the LAPL was considerably smaller for larger charges steps (at 44Hz) compared to 80Hz (~18qu versus ~21qu respectively ). It remained unsolved whether the stimulation frequency and/or the step size are influencing factors. Additionally it was not investigated if the stapedius reflex is influenced by the varying stimuli. Continuous growth stimuli were presented on all stimulating electrodes; and non-continuous stimuli were presented on three representative electrodes in the apical / middle / basal region. Recordings were performed on n=12 cooperative pediatric cochlear implant recipients aged 6 to 10 years at the Audiology Dept. of the University of Milano. Results: Determination of ECAP parameters (threshold and amplitude growth with respect to the stimulation intensity) was considerably faster using the fine-grain stimuli (compare to Lutz et al.). Identification of neural responses was easier for the fine-grain stimuli due to the higher resolution of stimulation intensities. The eSRT varied according to the different LAPLs reached;the analysis of the correlation is done regarding of the correlation between eSRT and LAPL for the different stimuli is presented. Conclusion: Information about the obtained loudest acceptable presentation limit and the elicitation of the eSRT stapedius reflex provide further insights about the nature of the electrically evoked auditory percept in children. Our results support the use of objective measures such as the variation of stimulation intensity and continuous growth to assess the change in auditory percept . Besides these findings, our study confirmed the suitability of the fine-grain stimulation paradigm for a paediatric population. References: Lutz et al [2015] Conference on Implantable Auditory Prostheses: Influence of the Recording Electrode on the ECAP Threshold using a Novel fine-grain Recording Paradigm
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