The Journal of the Acoustical Society of Korea (한국음향학회지)

The Acoustical Society of Korea (한국음향학회)
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Analysis of auditory temporal processing in within- and cross-channel gap detection thresholds for low-frequency pure tones

저주파수 순음에 대한 within- 및 cross-channel gap detectin thresholds를 이용한 auditory temporal processing 특성 연구

  • 구성민 (나우히어링 청각언어센터) ;
  • 임덕환 (한림대학교 언어청각학부, 청각언어연구소)
  • Received : 2021.11.15
  • Accepted : 2021.12.28
  • Published : 2022.01.31
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Abstract

This study was conducted to examine the characteristics of pitch perception and temporal resolution through Within-/Cross-Channel Gap Detection Thresholds (WC/CC GDTs) using low-frequency pure tones (such as 264 Hz, 373 Hz and 528 Hz related to C4, C4#, and C5 musical tones. 40 young people and 20 elderly people with normal hearing participated in this study. The results of WC GDTs were approximately 2 ms ~ 4 ms threshold values regardless of frequencies in two groups. There was no statistically significant difference in WC GDTs between groups. In both groups, CC GDTs were larger than WC GDTs, and as the frequency difference increased, the CC GDTs also increased. In particular, in the comparison between groups of CC GDTs, the results of the elderly group were 8 times ~ 10 times larger than that of the young group, and there was a statistically significant difference between the groups. These data also showed a different trend of GDTs in comparison with the previous data obtained from musical stimuli.This study suggests that GDTs may influence pitch perception mechanisms and can be used as psychoacoustic evidence for nonlinear responses of auditory nervous system.

본 연구는 저주파수 순음(264 Hz, 373 Hz, 528 Hz)을 이용하여 Within-/Cross-Channel Gap Detection Thresholds(WC/CC GDTs)를 통해서 피치인식 및 시간적 청각정보처리능력 특성을 알아보기 위해 실험연구를 실시하였다. 정상청력을 갖는 청년층 40명과 장년층 20명을 대상으로 WC/CC GDTs를 측정·비교분석하였다. WC GDTs 결과는 두 그룹 모두 평균적으로 2 ms ~ 4 ms를 갖으며, 통계적으로 유의미한 차이를 보이지 않았다. CC GDTs는 WC GDTs에 비해 두 그룹 모두 크게 증가하였으며, 특히 장년층의 결과가 청년층 결과에 비해 모두 8배 ~ 10배 증가하여 통계적으로 유의미한 차이를 보였다. CC GDTs는 선/후행음의 주파수의 차이가 커질수록 모두 증가하는 경향이 나타났으며, 청년층은 증가폭이 일정한 반면 장년층은 증가폭이 둔화되는 경향을 보였다. 또한, 이러한 자료는 기존 음악적 자극에 대한 GDT와는 다른 경향을 나타내었다. 연구 결과는 GDT가 피치인식 메커니즘에 영향을 미칠 수 있으며 청각 신경계의 비선형 반응에 대한 심리음향적 근거자료로 활용될 수 있을 것이다.

Keywords

Acknowledgement

본 연구는 일부 ARICS의 지원을 받아 진행되었습니다.

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