LXXVI The Effect of Simultaneous Loading of the Tympanic Membrane of the External Auditory Canal on Bone Conduction Sensitivity of the Normal Ear

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Abstract
Occlusion of the external auditory canal results in significant increases in BC [bone conduction] sensitivity of the normal ear for frequencies below 2000 cps but in slight increases in BC sensitivity for frequencies above 2000 cps. Loading the drum with 1 to 10 drops of Hg also results in significant increases in BC sensitivity below 2000 cps, but in slight decreases in BC sensitivity at 2000 and 4000 cps. Simultaneous occlusion of the external auditory canal and loading the eardrum with 2, 3 or 10 drops of Hg does not result in an additive effect. Two, 3 and 10 drops of Hg on the drum result in a greater BC sensitivity increase, especially at 250 cps, than occlusion alone. Combined occlusion and loading the drum with 2, 3 or 10 drops of Hg result in approximately the same change in BC as drum loading alone.

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