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Abstract
Many investigators have thought for a long time that bass deafness could never be of a perceptive kind. If an audiogram revealed a hearing loss for the low tones that proved to be greater than for the high tones, it was always said that this was due to an affection of the middle ear, or, in other words, the diagnosis in such a case was a conduction deafness. Many misunderstandings have arisen because insufficient precautions were taken while recording the bone conduction of the affected ear. This should always take place while the nonaffected ear is masked simultaneously.
