Dr. S. N. Reger, of the University of Iowa, independently discovered that the relationship between intensity level and loudness in the abnormal ear is strikingly different from that in the normal. For example, in the normal ear a frequency of 4096 cycles a given number of decibels above the threshold is judged as loud as 2048 cycles approximately the same number of decibels above the threshold. However, in abnormal ears, in which acuity is normal up to 2048 cycles but raised 60 decibels above threshold at 4096 cycles, an intensity level 10 decibels above the threshold at 4096 is judged as loud as 2048 cycles at 40 decibels above the threshold.
Proceedings of the Iowa Academy of Science
©1936 Iowa Academy of Science, Inc.
Kelly, Noble H.
"A Comparative Study of the Normal and Pathological Ear with Regard to Intensity Level Preference and Intelligibility of Speech sounds,"
Proceedings of the Iowa Academy of Science, 43(1), 289-299.
Available at: https://scholarworks.uni.edu/pias/vol43/iss1/97