Abstract
Whether a hearing-impaired patient exhibits a recruitment phenomenon is very important when adjusting the gain of a hearing aid. A frequency-specific examination for detecting recruitment phenomenon in infants has not been established. Therefore, the gain of hearing aids for hearing-impaired infants cannot be adjusted exactly. To solve this problem, we attempted to detect the recruitment phenomenon using ASSR, which is objective and has a high frequency specificity.
In this study, we investigated the relationship between the stimulus intensity and some response indexes of ASSR in 10 adults with normal hearing. The correlation between the stimulus intensity and the power was statistically significant. The correlation coefficient was 0.92 to 0.99 (median, 0.96) in waking subjects and 0.8 to 0.99 (median, 0.9) in sleeping subjects. The correlation between the stimulus intensity and the latency was also statistically significant. This correlation coefficient was -0.76 to -0.96 (median, -0.82) in waking subjects and -0.85 to -0.99 (median, -0.97) in sleeping subjects. The correlation between the stimulus intensity and the CSM was not statistically significant.
