Effects of the Number of Active Electrodes on Tone and Speech Perception by Nucleus 22 Cochlear Implant Users with SPEAK Strategy

Effects of Computer-Assisted Speech Training on Mandarin-Speaking Hearing-Impaired Children

“…Previous studies have shown that temporal envelope cues (e.g. amplitude contour and periodicity fluctuations) contribute most strongly to the moderate levels of tone recognition by CI patients [Fu et al, 1998Fu and Zeng, 2000;Hsu et al, 2000;Luo and Fu, 2004]. The results from the present study suggest that reception of temporal envelope cues can be improved with moderate auditory training.…”

“…Because F 0 information is not explicitly coded in contemporary CI devices, CI users have to rely on spectral and temporal envelope cues for tone recognition. Temporal envelope cues have been shown to provide moderate levels of tone recognition in CI users Hsu et al, 2000]. While auditory training can significantly improve CI users' phoneme recognition (i.e., segmental speech cues), it is unclear whether similar training can improve Chinese tone recognition (i.e., suprasegmental speech cues).…”

Deficits in auditory frequency discrimination and speech recognition in cochlear implant users

“…Furthermore, frequency discrimination in cochlear implant users was mostly investigated in relation to the technical aspects of the implant itself, such as (i) the type of electrical stimulation, (ii) the depth of the insertion of the electrodes, (iii) the numbers of electrodes, and (iv) the type of implant. It appears that these factors do not have a significant impact on discrimination thresholds (Fitzgerald et al, 2007;Hsu et al, 2000;McDermott and McKay, 1994;Qi et al, 2011). Moreover, time since implantation, gender, and speech-coding strategies also seem to have a negligible effect on frequency discrimination (Hughes and Abbas, 2006;Kopolovich et al, 2010;Xu et al, 2011).…”

Effects of Speech Processing Strategy on Chinese Tone Recognition by Nucleus-24 Cochlear Implant Users

“…Wei et al (1999) presented preliminary data showing that for four cochlear implant users, Chinese tone recognition improved with increasing number of electrodes, up to approximately 10 active electrodes. Hsu et al (2000) investigated the effects of the number of active electrodes on tone and speech perception in three Nucleus-22 cochlear implant users fitted with the SPEAK strategy. Results showed that for all subjects, recognition of phonetically balanced words decreased as the number of active electrodes was reduced.…”

“…Xu et al (2002) found that although there was a significant improvement in tone recognition as the number of channels was increased from 1 to 12, tone recognition was less dependent on the number of available spectral channels than phoneme or sentence recognition. Hsu et al (2000) investigated how the number of stimulating electrodes would affect Chinese tone recognition by Nucleus-22 cochlear implant users. They found no significant difference in performance as the number of electrodes was increased from 4 to 20.…”