인간은 어음을 지각하기 위해서 다양한 음향 신호 (acoustic cue)를 사용한다. 신호가중치(cue weighting) 란 이러한 다양한 음향 신호를 사용하는데 있어서 어음을 지각하기 위해 특정한 신호에 좀 더 집중하여 가중치를 두 는 것을 의미한다(Mayo & Turk, 2004; Nittrouer & Miller, 1997; Ohde & Harley, 1997; Walley & Carrell, 1983). 신호 가중치는 개인마다 차이가 있고 자음군의 유 형, 청력상태, 연령, 듣기 환경 등에 의해서도 차이를 보일 수 있다(Hedrick et al., 2011; Hedrick & Younger, 2007; Nittrouer, 2002).
The purpose of this study was to estimate a difference of cue weighting strategies to perceive fricative sounds in normal hearing adults (NHA), across various listening conditions. Eighteen NHA participated to four listening conditions (quiet, 0, -5, and -10 dB SNR). Two seven-step continua of synthetic CV syllables were constructed, with frication pole frequency varied from /s/ to /∫/ within the continuum, and appropriate formant transition values varied across continua. Relative weights applied to the frication, transition, and interaction cues were determined. In quiet condition, NHA gave more perceptul weight to the formant transition cue than to the frication, whereas they gave more perceptual weight to the frication in noisy conditions, rather than the formant transition. Also, in noisy conditions, they attended more to the frication cues than in quiet condition, and at -10 dB SNR condition, cue weighting strategy of fricative perception was significantly different to other conditions. The weight given the degree of cue interaction was not different across four conditions. Results from comparison of this study and the previous study in quiet condition showed that Korean listeners gave more attention to transition cues than American listeners. The results suggest that the longer duration cues were more weighted for perception in difficult listening condition than in easy listening condition, compared to the shorter duration cues and Korean listeners and American listeners used the different cue weighting strategy for perception of fricative sounds.
INTRODUCTION MATERIALS AND METHODS RESULTS DISCUSSIONS AND CONCLUSIONS REFERENCES
