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Purpose: To discriminate and/or perceive phonemes is one of the most important abilities in human communication. The purpose of current study was to measure the confusing matrix, similarity, and distance of Korean phonemes based on Shepard’s law and to provide Korean speech-perceptual map. Methods: To measure the similarity and distance, twenty young listeners with normal hearing conducted the speech discrimination task, which randomly assigned consonant-vowel (CV) combinations of 18 Korean consonants with /a/ vowel under quiet environment and two signal-to-noise ratio (SNR) noisy conditions (i.e., +3 and 0 dB SNR). The data of each participant was analyzed by classic confusion matrix. Based on the data of confusion matrix, the similarity and distance were calculated using the Shepard’s law. After calculating the distance, the speech-perceptual map was designated. Results: In general, the CV similarity was increased as a level of the background noise increased. The CV distance was also decreased as the noise levels increased. In quiet condition, only 18 pairs were showed confusing to discriminate. For the most confusing CV pair was /p/-/t/ which showed similarity of 0.14. With background noise, however, the +3 and 0 dB SNR conditions showed total 61 pairs and 64 pairs, respectively. The /ph/-/th/ was most confusing pair in both +3 (1.00 for similarity) and 0 dB SNR (0.98 for similarity). Conclusion: The results of current study suggest that the development of speech-perceptual map should be considered in the clinical settings in terms of rehabilitation for the hearing impaired listeners.

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