The Equivalent Dipoles for ABR
1998 Volume 41 Issue 1 Pages 52-58
Details
1998 Volume 41 Issue 1 Pages 52-58
The equivalent dipoles for ABR were estimated using the Dipole Tracing Method (DTM). 10 adult-healthy volunteers were employed for this study. The subject was laying on an EEG chair with closed eyes and presented clicks of 80dBnHL monaurally as the acoustic stimulation with/without masking noise to the contralateral ear. 21ch ABRs were obtained. Then, the grand averaged responses (GAs) among all subjects were calculated. The GAs were divided into the filtering ranges of 20-1500Hz (slow+fast band), 20-300Hz (slow band), and 300-1500Hz (fast band) with the FFT based digital filter. The waves IV, V and VI for these filtering ranges were analyzed using DTM. The dipoles for 20-1500Hz (slow+fast band) and 20-300Hz (slow band) were localized on the mid brain and the thalumus.
The estimated dipoles without masking noise in the range of 20-1500Hz were not divided into each wave. Those in the range of 20-300Hz were scattered or located different positions that will be resulted in the effects of both shadow response and binaural interaction.
