Domande sistemi neurosensoriali

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Esami Sistemi Neurosensoriali – Parte Grandori 1. funzione delle c.c. esterne 2. vie afferenti e efferenti del sist.uditivo e funzioni 3.se diminusco Istimolo come varia ABR in soggetti normoudenti. 4.schema a blocchi e funzionamento del BAHA 5. Segnali dell'Ecochg 6. prove di mascheramento.come si eseguono? 7. cosa è IDR e come si setta 8. SL E SPL definizione e relazione tra loro. 9.impedenza acustica . 10.funzioni orecchio medio e frequenza di taglio (filtro passa basso, Ft=1000-2000 Hz) 11. stimoli bifasici x ridurre l'artefatto ECAP 1.- What is the acoustic feedback in hearing aids? How can it be limited? 2.- Briefly explain what is a 'spectrogram' 3.- Describe and briefly explain the asymmetrical character of the masking phenomenon 4.- Calculate the maximum power required by a middle ear implantable prosthesis with an EM stimulator when the force on the middle ear is equal to 10 micronewtons, the maximum displacement of the stapes is equal to 3micrometers and the frequency response of t he prosthesis extends up to 5 KHz. Write explicitly the formula used. 5.- DPOAEs: What is represented on the DP-gram and on the I/O function plots. 6.- Briefly describe the main functions of OHC. 7.- Give a brief qualitative description of a typical click-evoked ABR signal in a normal-hearing subject. What is the time window for recording? 8.- What's the intensity value that corresponds to 10 dB SL? Give also a brief explanation 9.- What is the fundamental frequency (Fo) in speech? 10.- What are the 'active' and the 'indifferent' electrodes in a cochlear implant? What's the bipolar (BP) stimulation? 11.- Definition of the 'tuning curve' for a single fiber of the auditory nerve. 12.- What's a PST (post-stimulus time) histogram? 13.- What's the source-filter model in speech…