ABSTRACT
<b>Introduction</b> : The aim of this study was to determine the significance of the effects of hearing loss and different hearing abilities of both ears on mental activity and social interaction in the elderly.<br><b>Methods</b> : Fifty-six community dwelling elderly subjects were included in this study. Hearing acuity was measured and a questionnaire was undertaken in all subjects to evaluate their mental activity and social interaction. Based on the answers, the subjects were divided into (1) 3 groups, according to the level of hearing loss, and (2) 2 groups, according to the differences in hearing.<br><b>Results</b> : (1) When hearing by audiometric testing was compared to mental activity, no direct effects were found. Based on the questionnaire results, the subjects in the group with the greatest hearing loss were determined to be psychologically affected, and they therefore avoided social interactions. These patients were at risk of being socially isolated. (2) One group showed differences in hearing abilities of both ears, which could be a possible risk factor for loneliness and depression.<br><b>Conclusion</b> : This study suggests that hearing loss and different hearing ability of both ears affects mental activity and social interaction in the elderly. Both depression and being socially isolated are included under the Long-Term Care Prevention Project. It is necessary to determine the degree of hearing loss by using both subjective and objective evaluations.