Music Perception Ability of Korean Adult Cochlear Implant Listeners

Kim, Eunoak,Lee, Hyo-Jeong,Kim, Hyung-Jong Korean Society of Otorhinolaryngology-Head and Nec 2012 Clinical and Experimental Otorhinolaryngology Vol.5 No.suppl1

<P><B>Objectives</B></P><P>Although the cochlear implant (CI) is successful for understanding speech in patients with severe to profound hearing loss, listening to music is a challenging task to most CI listeners. The purpose of this study was to assess music perception ability and to provide clinically useful information regarding CI rehabilitation.</P><P><B>Methods</B></P><P>Ten normal hearing and ten CI listeners with implant experience, ranging 2 to 6 years, participated in the subtests of pitch, rhythm, melody, and instrument. A synthesized piano tone was used as musical stimuli. Participants were asked to discriminate two different tones during the pitch subtest. The rhythm subtest was constructed with sets of five, six, and seven intervals. The melody & instrument subtests assessed recognition of eight familiar melodies and five musical instruments from a closed set, respectively.</P><P><B>Results</B></P><P>CI listeners performed significantly poorer than normal hearing listeners in pitch, melody, and instrument identification tasks. No significant differences were observed in rhythm recognition between groups. Correlations were not found between music perception ability and word recognition scores.</P><P><B>Conclusion</B></P><P>The results are consistent with previous studies that have shown that pitch, melody, and instrument identifications are difficult to identify for CI users. Our results can provide fundamental information concerning the development of CI rehabilitation tools.</P>

Comparison of Speech Audiometry Using KS Word List and Hahm's List in Hearing Impaired Adults

Park, Sung Hye,Lee, Hyo-Jeong,Kim, Jina,Kim, Eunoak,Lee, Jung-Hak,Kim, Hyung-Jong 한국레이저가공학회 2015 한국레이저가공학회 학술대회 논문집 Vol. No.

Effects of Electrical Stimulation Rate on Speech Recognition in Cochlear Implant Users

Sung Hye Park,김형종,Eunoak Kim,이효정 대한청각학회 2012 Journal of Audiology & Otology Vol.16 No.1

Background and Objectives: The stimulus signals delivered in cochlear implant (CI) systems are generally derived by sampling the temporal envelope of each channel at some constant rate and using its intensity to control the stimulation current level delivered to the corresponding electrode site. The objective of the study was to investigate speech recognition performance of cochlear implant users in quiet and noisy environments using either moderate or high rates of electrical stimulations. Materials and Methods: Six post-lingually deafened adult users of the Nucleus CI24 cochlear implant (Contour® electrode array, CochlearTM, Macquarie Park, Australia) with the Freedom® speech processor participated in the study. Stimulation rates of 900 and 2400 pulses-per-second/channel (pps/ch) were used after both stimulation programs were balanced for loudness. Monosyllabic word and sentence recognition scores in quiet and noisy environments were evaluated for each stimulation program after two months of practice. Subjects were also asked to respond to a questionnaire to examine their preference to any stimulation rate in different hearing conditions. Results: Word recognition scores for monosyllabic words in quiet conditions with the 900 stimulation rate was better than that of the 2400 stimulation rate, although no significant differences between them were found for sentence test in noise. A survey questionnaire indicated that most subjects preferred the 900 stimulation rate to the 2400 stimulation rate, especially in quiet conditions. Conclusions: Most subjects indicated a preference for 900 pps/ch rate in quiet conditions. It is recommended to remap at 900 pps/ch for those CI users whose performance in quiet conditions is less than ideal

Psychometrically Equivalent Korean Monosyllabic Speech Discrimination Materials Spoken by Male and Female Talkers

Richard W. Harris,Eunoak Kim,Dennis L. Eggett 한국언어청각임상학회 2003 Communication Sciences and Disorders Vol.8 No.1

본 연구의 목적은 청력검사시 어음명료도 측정에 사용될 한국어 단음절 검사어표를 제작하는 것이다. 이 연구에 사용된 250개의 단어들은 한국어 형태소 및 어휘 사용 빈도의 분석(김흥규 & 강범모, 2000) 이란 자료를 통해 선택되었다. 검사용 단어들은 한국어 표준말을 구사하는 각각의 남녀에 의해 디지털 방식으로 녹음되었다. 각 단어들을 정상 청력자 20명에게 5에서 40dBHL 까지 5dB 간격으로 청취하게 한후, 10개의 자극강도에서 명료도 검사 성적을 측정하였다. 250개의 단어중 명료도 성적이 좋은 200개의 단어를 최종 컴팩트 디스크에 포함시켰다. 따라서, 한 개의 표당 단어가 50개씩 구성 되어 있는 4개의 검사어표(full-lists)와 각 표를 다시 둘로 나누어 25개의 단어를 포함하게 한 8개의 검사어표(half-lists)가 제작되었다. 이 검사어표들은 표간에 대등한 명료도 성적을 갖도록 단어의 강도를 조절하였다. Chi-square 분석은 이들 검사어표 간에 통계학적으로 차이가 없음을 나타내었다. 한국 단음절 검사어표는 남녀 각각에 의해 브리감 영 대학교 한국 어음 청력 검사어표(Disc 1.0) 컴팩트 디스크에 녹음되었다. This investigation was undertaken to develop, digitally record, evaluate, and psychometrically equate Korean monosyllabic word lists for use in measurement of auditory word recognition. Two hundred fifty monosyllabic words were selected from a Korean frequency usage dictionary: Frequency Analysis of Korean Morpheme and Word Usage(Kim & Kang, 2000). These words were digitally recorded by both male and female talkers native to Seoul, Korea. Percent correct word recognition was measured for each word at 10 intensity levels from 5 to 40dBHL in 5dB increments using 20 normally hearing subjects. Difficulty rankings were calculated for each of the 250 monosyllabic words. The 200 monosyllabic words that were easiest to identify were selected for inclusion in the final compact disc recordings. Four equivalent word lists of 50 words each and eight half-lists of 25 words each were formed from the selected monosyllabic words. A chi-square analysis revealed no statistically significant differences in audibility among the lists or half-lists. In order to increase homogeneity of audibility of the lists and half-lists, the thresholds of the 16 monosyllabic half-lists were adjusted so that the threshold of each list was equal to the midpoint(11.1dBHL) between the mean threshold of the male half-lists and the mean threshold of the female half-lists. No attempt to phonemically balance the 4 lists, or 8 half-lists was made. The concept of phonemic balance is briefly discussed. The psychometrically equivalent Korean monosyllabic word recognition lists, spoken by both male and female talkers, are included on the Brigham Young University Korean Speech Audiometry Materials(Disc 1.0) compact disc.

Psychometrically Equivalent Korean Bisyllabic Words Spoken by Male and Female Talker

Richard W. Harris,Eunoak Kim,Dennis L. Eggett 한국언어청각임상학회 2003 Communication Sciences and Disorders Vol.8 No.1

본 연구의 목적은 청력검사시 어음청취역치 측정에 사용될 한국어 이음절 검사어표를 제작하는 것이다. 일상 생활에서 사용 빈도가 높은 90개의 이음절을 한국어 형태소 및 어휘 사용 빈도의 분석(김흥규 & 강범모, 2000)이란 자료를 통해 선택하였다. 이 검사용 단어들은 한국어 표준말을 구사하는 각각의 남녀에 의해 디지털 방식으로 녹음되었다. 각 단어들을 정상 청력자 20명에게 10 에서 18dBHL 까지 2dB 간격으로 청취하게 한후, 15 개의 자극강도에서 인지도를 측정하였다. 90 개의 단어중 인지도 성적이 가장 좋은 36개의 단어를 선택한후, 각 단어의 역치가 연구에 참가한 20명의 정상 청력자의 평균 순음역치(4.33dBHL)와 같도록 디지털 방식으로 조절하였다. 36개의 이음절에 대한 평균 인지도 곡선(%/dB)은 남자 목소리로 녹음된 것이 11.9%/dB 이고, 여자 목소리로 녹음된 것이 10.4%/dB로 나타났다. 단어간에 인지도가 서로 대등하도록 제작된 이 36 개의 이음절은 남녀 각각에 의해 브리감 영 대학교 한국 어음 청력 검사어표(Disc 1.0) 컴팩트 디스크에 녹음 되었다. This investigation was undertaken to develop, digitally record, evaluate, and psychometrically equate Korean bisyllabic words for use in measurement of the speech reception threshold(SRT). Ninety familiar bisyllabic words were selected for evaluation. These words were recorded by both male and female talkers native to Seoul, Korea who spoke the standard Korean dialect. Psychometric functions were calculated, using logistic regression, for each of the 90 bisyllabic words for 20 normally hearing subjects who listened to these words at 15 intensity levels from 10 to 18dBHL in 2dB increments. The 36 best bisyllabic words were selected and then digitally adjusted, with respect to intensity, so that the threshold of each word was equal to the mean PTA(4.33dBHL) of the normally hearing subjects. The mean slope(%/dB) for the bisyllabic words was 11.9%/dB for the male talker and 10.4%/dB for the female talker. The result was the development of a list of 36 Korean bisyllabic words(male and female talker) which were homogeneous with respect to threshold audibility and also with respect to psychometric function slope.These psychometrically equivalent Korean bisyllabic words spoken by both male and female talkers are included on the Brigham Young University Korean Speech Audiometry Materials(Disc 1.0) compact disc.