Slow components of the auditory brain stem responses (ABRs) were recorded from the scalp and earlobes electrodes using balanced non-cephalic reference electrode method. Active electrodes were placed using.
International 10-20 system in coronal (A1, T3, C3, Cz, T4, A2) and in sagittal (Fpz, Fz, Cz, Pz, Oz.) planes. The results were compared with the standard vertex to earlobe deviation.
These studies lead us to the following conclusions:
1. The slow components of the ABRs are broadly distributed over the scalp, and they are positive at all recording points with monoaural stimulation.
2. The slow components are of maximal amplitude at the region of Cz in all of the recording points.
3. Amplitude of the slow component from Cz-neck is higher than that from standard vertex-earlobe deviation.
In clinical slow components recording, earlobe is usually used as a reference point, however, it was clarified that it was active electrode.
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