시간축 상에서 수행되는 청각정보처리(temporal processing)는 제한된 시간 내에서의 소리가 갖는 특이한 패턴의 인식이라고 볼 수 있다.5)11) 이러한 시간적 정보처리는 언어나 비언어적인 처리 모든 경우에서 중요시 되는 요소이다. 관련된 예로 음악적 요소의 인지, 리듬, 자극의 주기성, 피 치 인식, 음길이 변별 및 음소변별 등 여러 가지 청각기능이 있다.6) 이러한 시간적 청각정보처리 능력을 나타내는 여러 척도가 있는데, 그 중에서 gap detection threshold (GDT)는 temporal resolution을 측정하는 유용하고 간결한 심리음
GDT has been known to be an important feature in temporal processing of auditory stimuli. The basic properties of GDT were relatively well known in response to pure tones and banded noises. There, however, have been few data as to how musical stimuli could affect GDTs. In this experiment, effects of musical stimuli on within-channel GDT were examined in normal adults. Three piano notes, such as C4, F4#, and C5, were digitally sampled and synthesized. Tested group consisted of young adults of 10 males and 10 females with mean ages of 23.9 for male and 21 for female. Stimuli were delivered at the level of 60 dB HL in monotic condition (modified Two Alternative Forced Choice, 2AFC). The results were as follows：1) In within-channel gap detection, thresholds were elevated as tonal pitches of the musical notes were increased (p<0.01). This trend was similar to those from pure tone data. 2) No statistically significant differences were observed in this experiment as to GDT dependency on right/left ears, gender differences, and musical education periods (p>0.01). In summary, the results from within-channel conditions were consistent with those from the previous studies with sinusoidal stimuli. The data with musical stimuli may be used to evaluate the ability of musical signal processing in subjects with normal and impaired hearing and can be helpful in measuring the outcomes of auditory rehabilitation. KEY WORDS：Musical tones·Within-channel GDT·Pitch·Temporal processing
INTRODUCTION METHODS AND MATERIALS RESULTS DISCUSSIONS SUMMARY AND CONCLUSIONS REFERENCES
