음악 자극이 정상인의 Within Channel Gap Detection Threshold에 미치는 영향 = Effects of Musical Tones on Within-Channel Gap Detection Thresholds in Normal Adults

다국어 초록 (Multilingual Abstract)

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.

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