목적: The additional hearing-aid (HA) benefit on speech-recognition performance over amplification itself remains uncertain. The aim of this study was to evaluate whether HA could improve auditory spectral resolution, temporal resolution and speech-recognition ability in quiet or noise background. 방법:Subjects included 20 elderly listeners (58.7 years, 8 males, 12 females) using HA more than 3 months (36.0 months, 11 unilateral HA, 9 bilateral HA) in everyday life and their aided performances and unaided performances were compared. Four different psychoacoustic measurements were performed 1) spectral-ripple discrimination (SRD), 2) temporal modulation detection (TMD), 3) speech discrimination score (SDS) in quiet and 4) speech recognition threshold (SRT) in white noise. All test signals were presented from a loudspeaker located 1m in front in a sound- attenuating booth at their MCLs in either unaided or aided condition. 결과:There were no significant differences of SRD thresholds, TMD thresholds between unaided condition and aided condition. In contrast, higher SDS and lower SRT in noise (i.e., poorer speech perception ability) were showed in aided condition compared to unaided condition (Wilcoxons signed rank test, p< 0.05). There were no significant differences of HA benefits (aided minus unaided performances) measured on 4 different tests between unilateral HA wearer and bilateral HA wearer. Among various factors, the benefit of SRT in noise only showed significant correlation with users satisfaction measured by IOI-HA (International Outcome Inventory for HA) (Multiple regression analysis, Standardized β Coefficient = - 0.795). 결론:There were the additional HA benefits on speech-recognition abilities under both quiet and noise condition at least in test booth. However, this was not true on auditory spectral resolution or temporal resolution.