人工電子耳使用者對環境音知覺及短期聽能訓練之成效
| Autor: | 田岱立 |
|---|---|
| Rok vydání: | 2011 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 99 Environmental sounds provide a rich and valuable source of information for listeners in establishing their sense of places and events around them. Although accurate recognition of environmental sounds is a major concern for users of cochlear implants, training of environmental sounds is often conducted for a short period time in the early stages of audiological rehabilitation. Only limited number of studies has been carried out on the perception of environmental sounds by implanted listeners. The aims of the present study were (1) to investigate the perception of environmental sounds by children with a cochlear implant (2) to examine whether perception of environmental sounds could be improved with a short-term training. Seven implanted children were recruited in this study. They were tested in a pretest–posttest design with five training sessions. For both the pretest and posttest, subjects were tested using the entire stimulus set (42 sound sources, 4 exemplars each; a total of 168 stimuli). The training sounds were selected individually for each subject, and comprised one half of the sound sources with 50% correct or less (“Difficult-Trained” group). Two subgroups were further divided: Only two exemplars of each “Difficult-Trained” sound source were used in training (“Difficult-Trained-used” subgroup); the other two exemplars were not trained and used for examining the generalization of training effect (“Difficult-Trained-alternative” subgroup). During each training session, subjects were presented with all trained stimuli first, and then were asked to identify the stimuli. In the identification stage, feedback was given after each trial. The results showed that the overall average recognition was about 65% in the pretest session, and perception of environmental sounds did improve with training. The biggest improvement was demonstrated for the sound samples used in training. The percentage correct improved 52% in the “Difficult-Trained-used” subgroup (from 29% on the pretest to 81% on the posttest).There was also a considerable improvement, about 15%, in the “Difficult-Trained-alternative” subgroup. The results indicated that training effects could generalize to alternative sounds which were not used in training. Key word: cochlear implants, environmental sounds, short-term auditory training |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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