1990 Volume 33 Issue 6 Pages 749-753
Three-dimensional dipole tracing of ABR (wave V) was carried out in normal adults. The current dipole model is usually used as neural electric generators.
The ABRs in this study were elicited by the unilateral acoustic stimuli and recorded from 16 electrodes using balanced non-cephalic reference electrodes (BNEs). Active electrodes were placed at 16 sites on the scalp in according with the international 10-20 method. Click stimuli (100dBnHL) were used and a band noise masking (50dBnHL) was applied for contralateral ear. The evoked potentials from the 16 electrodes were amplified using with a band pass filter (20-1500Hz), and they were averaged up to 2048 times. The elecited dipole was presented by both the location and the vectormoment on the head model. In order to estimate the location and the vector moment of the dipole, the inverse dipole solution was applied under the Dipole-Tracing method. The head model was constructed from 17 slices of CT-images of a human skull.
In this study, the dipole of wave V moved from the ipsilateral brain stem to the contralateral, and furthermore, upward, forward, and finally downward.
