Abstract
Brain electrical activity mappings of ABR components by two methods were studied in cats.
One is so-called “Peak to Peak” method, in which the amplitude is measured from a positive peak to the succesive negative peak of ABR component. Another is so-called “Baseline to Peak” method, in which the amplitude is measured from the baseline to a positive peak of ABR component.
The differences on the scalp topography in these methods were as follows:
1) Wave I: Mappings by “Peak to Peak” method were more stable and reliable than “Baseline to Peak” method on the scalp topography.
2) WaveIII, waveIV: On the highest electrical ratio area, mappings by “Peak to Peak” method were similar to those by “Baseline to Peak” method, but as for the electrical ratio slope, “Peak to Peak” method showed more steep than “Baseline to Peak” method.
3) Wave V: Mappings by “Baseline to Peak” method were greatly influenced by slow component of ABR.
