Abstract
The transcranial transmission is important in the bone-conducted (BC) audiometry where the BC hearing thresholds depend on the stimulation position. It is also important for fitting of BC hearing aids; the transcranial transmission determines the amount of the sound that reaches the contralateral cochlea. Previous reported transcranial transmission results seem to depend on the method used. Here, a comparison between the transcranial transmission measured with BC hearing thresholds and ECSP is performed for both open and occluded ear canal. A BC transducer provided stimulation at both mastoids and the forehead. The ECSP was measured with a probe microphone and the BC hearing thresholds were obtained while masking the nontest ear. The transcranial transmission was determined as the BC hearing threshold or the ECSP for contralateral stimulation relative ipsilateral stimulation. The transmission from the forehead was calculated in a similar way. The transcranial transmission was similar for BC hearing thresholds and ECSP above 800 Hz; this indicates that the ECSP can be used as an estimator of the relative hearing perception by BC. The transcranial transmission results are also similar to vibration measurements of the cochleae made in earlier studies. Hence, vibration measurements of the cochleae can also estimate relative BC hearing.
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