<原著>音の強さの弁別能の加齢変化について : DLSI検査法による検討

概要

論文の詳細を見る
Auditory intensity difference limen (IDL) has so far been determined by various test methods such as two-tone comparison (Denes and Naunton), amplitude modulation (Luscher and Zwislocki ) and SISI (Jerger ). In this study, difference limen for short increment (DLSI) was used as a criterion for testing IDL. DLSI values were determined as a function of the magnitude of increment instead of units of 1 dB measured in SISI, and the minimum detectable increment was measured in dB. After comparative preliminary experiments with ascent and descent methods, a concept of limitation was also introduced into the up-and-down method employed. DLSI was measured in 280 subjects (40 each in all the decade-groups from twenties to eighties), for physiological IDL in aged subjects has been little reported. Two statistically significant different regression lines were obtained between the groups from twenties to forties and the groups from fifties to eighties. The former has a regression line of 0.0115 dB/year and the latter 0.0194 dB/year. These two regression lines revealed an interesting point (51.6 years, 1.59 dB). This point indicates an age at which the aging process is assumed to change.
近畿大学の論文
1986-09-25