Previous experimentation has indicated that under the following two conditions one's sensitivity for bone-conducted sound is increased: (1) closure of the external auditory meatus; and (2) filling the meatus with water. There has been much discussion as to whether this '"increased" sensitivity is apparent or real. This study attempted to investigate the phenomenon of "increased" bone conduction in the normal occluded ear. The experimentation was conducted in a sound proof room. The source of sound was a Western Electric 2-A audiometer, which permitted control of the intensity of eight octave frequencies, ranging from 64 to 8192 cycles. The bone conduction receiver was a vibrating button-type oscillator, part of a bone conduction hearing aid. Measurement was made with the receiver on the mastoid bones and on the forehead, and with the ears both open and occluded. Occlusion was affected with white vaseline.
Proceedings of the Iowa Academy of Science
©1938 Iowa Academy of Science, Inc.
Kelley, Noble H.
"The Phenomenon of "Increased" Bone Conduction,"
Proceedings of the Iowa Academy of Science, 45(1), 263-264.
Available at: https://scholarworks.uni.edu/pias/vol45/iss1/69