Analysis of slow vertex responses (SVR) of the infants evoked by acoustic stimuli was carried out under a series of computarized procedures.
These procedures were, 1. averaged power spectra of the EEG, 2. power spectrum of the averaged EEG, 3. amplitude histogram of the averaged EEG, with or without acoustic stimuli. Results;
1. Averaged power spectra were supposedly useful for objective identification of the SVR, however, power spectrum of the averaged EEG and amplitude histogram showed little significance on the evalution of SVR.
2. Power in δ frequency band was appropriate as the index for the objective judgement of SVR.
3. SVR may be understood to be positive when the power in δ frequency band is over 60%, and negative when it is under 50%. The evaluation of the SVR is not clear when the power in δ frequency band is between 50% and 60%.
