AIM: Accomplish an intra-subject study, evaluating the speech perception and preferences in deaf implanted with the Nucleus 24 device fitted with SPEAK, CIS and ACE strategies (Spectral Peak - SPEAK, Continuous Interleaved Sampler - CIS e Advanced Combination Encoders - ACE). STUDY DESIGN: Clinical prospective. MATERIAL AND METHOD: Seven adults with post-lingual deafness were distributed randomly in groups entitled A and B for the application of the evaluation protocol. The CIS strategy was fitted to the group A and the ACE strategy to the group B. The SPEAK strategy was the basis for all aspects. Evaluations of sentences, recognition in silence and noisy situations (cocktail party, S/N +10 dB) and adjustments of the codification strategies were carried out. Self-assessment questionnaires were applied as well. RESULTS: The results indicated that high levels of speech recognition were observed, in silence and in noise, for all encoding strategies. The average scores obtained for the recognition of sentences in silence were 76,2%, 69,1%, and 80,2% for the SPEAK, CIS, and ACE strategies, respectively. For the recognition of sentences in noise the average scores obtained were 38,0%, 40,8% and 53,1% for the SPEAK, CIS and ACE strategies, respectively. There was no difference statistically significant between the encoding strategies. High speech recognition scores were obtained for each subject with the optimization of the strategy. CONCLUSION: The use of multiple speech encoding strategies as well as the choices of the various parameters allow for the clinician to fit an individual program, resulting in greater benefits for the cochlear implant users.
deafness; cochlear implantation; speech perception
