تاثير فيدبك شنوايي بر نحوه تغييرات فركانس اصلي در افراد بزرگ سال فارسي زبان داراي نقص شنوايي پس از كاشت حلزون چند كاناله

In this paper, the FO-contours have been extracted from the speech of 5 postlingual hearing-impaired adults who are multichannel cochlear implant users, and 10 normal-hearing male and female adults. Regularity of each contour have been measured using the absolute value of average differences between Fo in successive syllables of each sentence (MSD, Mean Successive Differences) and used as a quantiative cue for determination of auditory feedback effects on improvement of patientʹs contours. Results show that: 1) After cochlear implantation, changes in patient FO contours would be decreased and their MSD features would converge to its normal value. 2) Dependency of MSD feature to patient continuoue access to the auditory feedback would decrease by time. On the other hand, patients could learn to produce this feature correctly by time. So, they could produce it correctly after 12 months of implantation without need to access to auditory feedback.