Wednesday, January 5, 2011

Bimodale o Bilaterale? E la Nuova Ricerca Indica...

Indica che ancora non ci sono risultati conclusivi che ci dicano che utilizzare un impianto cocleare insieme alla protesi sia più o meno efficace che utilizzare l'impianto cocleare bilaterale.

Comparison of bimodal and bilateral cochlear implant users on speech recognition with competing talker, music perception, affective prosody discrimination, and talker identification.

Cullington HE, Zeng FG.

1South of England Cochlear Implant Centre, Institute of Sound and Vibration Research, University of Southampton, United Kingdom; and 2Anatomy and Neurobiology, Biomedical Engineering, Cognitive Sciences and Otolaryngology-Head and Neck Surgery, University of California, Irvine, California.

OBJECTIVES: : Despite excellent performance in speech recognition in quiet, most cochlear implant users have great difficulty with speech recognition in noise, music perception, identifying tone of voice, and discriminating different talkers. This may be partly due to the pitch coding in cochlear implant speech processing. Most current speech processing strategies use only the envelope information; the temporal fine structure is discarded. One way to improve electric pitch perception is to use residual acoustic hearing via a hearing aid on the nonimplanted ear (bimodal hearing). This study aimed to test the hypothesis that bimodal users would perform better than bilateral cochlear implant users on tasks requiring good pitch perception.

DESIGN: : Four pitch-related tasks were used.Bilateral cochlear implant users were chosen as the comparison group. Thirteen bimodal and 13 bilateral adult cochlear implant users were recruited; all had good speech perception in quiet.

RESULTS: : There were no significant differences between the mean scores of the bimodal and bilateral groups on any of the tests, although the bimodal group did perform better than the bilateral group on almost all tests. Performance on the different pitch-related tasks was not correlated, meaning that if a subject performed one task well they would not necessarily perform well on another. The correlation between the bimodal users' hearing threshold levels in the aided ear and their performance on these tasks was weak.

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(Grazie Baby;-))

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