刺戟時ラウドネス順応(Perstimulatory Loudness Adaptation)の研究

概要

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1. Actual process of the development of lou-dness decrease (perstimulatory loudness adaptation)was measured and recorded by means of Bekesy audiometry.2. Loudness decrease occured abruptly imme-diately after the stimulation began, and rapid but negatively accelerated development followed, Lou-dness decrease was mainly observed in the firs tseveral seconds but asymptote was reached about 1 to 3 minutes later.3. The amount of loudness decrease became greater as a test tone was intensified and it attai-ned a maximum amount at 80db of suprathreshold level. But it seemed to be almost constant bet-ween 70db and 90db and it showed a tendency of decrease if a test tone was intensified still greater.4. The amount of loudness decrease was lar-ger at 1000cps and higher frequency tone than 500cps. Even if the different rates of loudness growth at these frequencies were corrected, this tendency was still maintained.5. It seemed that there was no relationshipbetween the amount of loudness decrease and a rise decay time or a duty cycle if the comparison tone was completely interrupted.6. The ear which was adapted to the tone of 1000cps was thought to be adapted to the tone of 2000cps too.
社団法人日本耳鼻咽喉科学会の論文