노화, 주파수여과, 시간압축이 단음절 및 환경음 인지에 미치는 영향

서지정보

ㆍ발행기관 : 한국청각언어재활학회 ㆍ수록지정보 : 청능재활 / 7권 / 1호
ㆍ저자명 : 이재희, 배정현

목차

"INTRODUCTION
MATERIALS AND METHODS
RESULTS
DISCUSSIONS AND CONCLUSIONS
REFERENCES"

한국어 초록

어음과 환경음은 인간의 의사소통 시 다양한 정보를 제공하는 중요한 소리이다. 그러나 실제생활에서 다양한 배경소음, 청자의 청력상태, 화자의 발화속도 등에 의해 소리 내 중요한 주파수 혹은 시간적 정보(spectral or temporal information)가 제한될 수 있다. 국내외 다양한 선행 연구는 주파수, 시간적 정보가 감소하면 청자의 소리인지능력이 유의미하게 저하하고 노인일수록 그 저하 정도가 컸음을 밝혔다.

영어 초록

"Speech as well as environmental sounds are important for communication in everyday life. When the spectral and temporal information of these sounds is distorted or restricted, numerous studies have found that older listeners show a larger decline in recognition performance compared to the young. The present study compares recognition performances of young and elderly listeners with normal hearing (YNH and ENH groups) when low-pass spectral filtering and time compression were applied to monosyllables or environmental sounds. All the words and sounds were presented at 65 dB SPL, and the subjects wrote down the monosyllables they heard or made answers to the list of the environmental sounds. When the monosyllabic words were low-pass filtered with 6, 4, 3, 2 and 1 kHz cutoff frequencies with or without time comprssion of 40%, the effects of aging, spectral filtering, and time compression were all significant. When the environmental sounds were presented in the closed-set format under the same conditions, all the factors of aging, spectral filtering, and time compression significantly affected listeners' performances as well. This result suggests that, regardless of whether the words or environmental sounds are spectrally or temporally distorted, a greater spectral and temporal distortion results in worse recognition performance. Our data supports the previous finding that the old listeners have a declined ability to recognize monosyllabic words and environmental sounds which are spectrally or temporally distorted. The most common type of word recognition errors was initial consonant replacement for both YNH and ENH groups. Especially, the high-frequency (>4kHz) initial consonants among the wrong answers were frequently replaced with other consonants with lower-frequency information. Results of error analyses revealed that the most common error type for word recognition was initial consonant replacement in both YNH and ENH groups. Especially, initial consonants with high-frequency information (>4 kHz) were frequently replaced with other consonants with lower frequency information.
KEY WORDS : Aging, Environmental sound recognition, Monosyllabic word recognition, Spectral filtering, Time compression."

참고 자료

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