Kirk K I, Pisoni D B, Sommers M S, Young M, Evanson C
Department of Otolaryngology-Head and Neck Surgery, Indiana University School of Medicine, Indianapolis, USA.
Ann Otol Rhinol Laryngol Suppl. 1995 Sep;166:300-3.
This study examined the influence of stimulus variability and lexical difficulty on the speech perception performance of adults who used either multichannel cochlear implants or conventional hearing aids. The effects of stimulus variability were examined by comparing word identification in single-talker versus multiple-talker conditions. Lexical effects were assessed by comparing recognition of "easy" words (ie, words that occur frequently and have few phonemically similar words, or neighbors) with "hard" words (ie, words with the opposite lexical characteristics). Word recognition performance was assessed in either closed- or open-set response formats. The results demonstrated that both stimulus variability and lexical difficulty influenced word recognition performance. Identification scores were poorer in the multiple-talker than in the single-talker conditions. Also, scores for lexically "easy" items were better than those for "hard" items. The effects of stimulus variability were not evident when a closed-set response format was employed.
本研究考察了刺激变异性和词汇难度对使用多通道人工耳蜗或传统助听器的成年人言语感知能力的影响。通过比较单说话者与多说话者条件下的单词识别来研究刺激变异性的影响。通过比较“简单”单词（即出现频率高且语音相似单词或邻词少的单词）与“难”单词（即具有相反词汇特征的单词）的识别来评估词汇效应。单词识别能力通过封闭或开放反应格式进行评估。结果表明，刺激变异性和词汇难度均影响单词识别能力。多说话者条件下的识别分数低于单说话者条件。此外，词汇“简单”项目的分数高于“难”项目。采用封闭反应格式时，刺激变异性的影响不明显。
