The Journal of the Acoustical Society of Korea (한국음향학회지)

The Acoustical Society of Korea (한국음향학회)
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Perception of Time-altered Sentences and Selective Word Stress by Normal-hearing Listeners

시간 변화와 선택적 단어 강조법이 정상 청력 성인의 문장인지도에 미치는 영향

  • 한우재 (한림대학교 자연과학대학 언어청각학부, 청각언어연구소) ;
  • 유재형 (한림대학교 일반대학원 언어청각학과) ;
  • 조수진 (남부대학교 언어치료청각학과)
  • Received : 2013.06.18
  • Accepted : 2013.07.17
  • Published : 2013.09.30
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Abstract

The present study examined whether sentence perception scores were changed under various conditions of time alteration (compression and/or expansion) and selective word stress in normal hearing listeners. Twenty young normal hearing adults (ten males) were participated. As stimuli, Korean standard-sentence list for adults (KS-SL-A) modified to semantically anomalous sentences was newly recorded by a female speaker. Seven different time-altered conditions (e.g., ${\pm}60%$, ${\pm}40%$, ${\pm}20%$, 0 %) were controlled. To see the effect of selective word stress (i.e., the emphasis of specific syllables in the sentence), all subjects were tested twice 2 weeks apart. The results showed 1) there was significantly different sentence perception scores among the different time-altered conditions, yet only in the 60 % compression condition; 2) there was no significant difference of the sentence perception scores in the effect of stress; however, there was a positive effect of the selective word stress in the sentences consisting of 6 ~ 7 syllables at the 40 % compression condition; 3) there was no significant gender difference. The pattern of results suggests that the combination of time compression and selective word stress is more effective to understand speech, instead of only using time expansion condition. However, further studies should be needed for standardization.

본 연구는 정상 청력인에서 시간 변화 (i.e., 압축과 확장)와 선택적 단어 강조법이 문장인지도에 영향을 미칠수 있는지를 평가하였다. 정상 청력을 지닌 성인 20명이 연구에 참여 하였다. 자극음으로 한국표준 일반용 문장표(KS-SL-A)가 사용되었고, 문법적으로는 적절하지만 의미론적으로는 변칙적이고 무의미하게 재구성한 후, 여성 화자에 의해 녹음하였다. 시간 변화는 7단계 (e.g., ${\pm}60%$, ${\pm}40%$, ${\pm}20%$, 0 %)의 압축 및 확장으로 조절하였다. 이 때 선택적 단어 강조법 (i.e., 문장 내에서 특정 단어를 강조)의 효과를 보기 위하여 모든 대상자들에게 2주 간격으로 두 번 검사를 시행하였다. 연구 결과 1) 시간 변화에 따른 문장인지도 정반응률은 60 % 압축 조건에서만 통계적으로 유의하게 낮았다. 2) 선택적 단어의 강조 유무에 따른 문장인지도의 정반응률은 유의한 차이가 없었다. 그러나 6 ~ 7개의 어절로 이루어진 장문장의 자극음을 사용할 경우, 40 % 압축 조건에서 단어가 +6 dB 강조되었을 때, 유의하게 정반응률이 향상되었다. 3) 성별에 따른 문장인지도의 정반응률은 유의한 차이가 없었다. 본 연구의 결과는 조금 빠른 시간 압축과 선택적 단어 강조법을 함께 사용했을 때가 시간 확장만 사용하였을 때보다 문장을 이해하는데 더 효과적임을 시사하고 있다. 그러나 후속 연구에 의한 표준화 자료가 동반되어야 하겠다.

Keywords

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