Presbyacusis III. Perstimulatory Threshold Adaptation

Abstract

Studies on perstimulatory threshold adaptation were made in 41 presbyacutic ears with a Grason-Stadler model E 800 Btétéy-audiometer using both interrupted and continuous test tones. No adaptation appeared when 200 msec pulsed tones were used. With continuous tones adaptation after 3 min was always less than 10 dB at 250 and 500 Hz. At 1,000 Hz adaptation between 10–30 dB was found in 8%, at 2,000 Hz in 25% and at 4,000 Hz in 2976. During the stimulation, the excursion amplitude remained unchanged with a pulsed tone and with continuous tone there was diminution in size at 4,000 Hz only.