<prompt> What is the effect of 1-2 MAC dose of volatile anaesthetic agents on EEG waveforms-b-a-th-SS-th-a-bb -th-S- aa - th-S- b  <response>: EEGs recorded on the scalp can be processed to quantify the amount of activity in each of four frequency bands: Delta o to 3hz, Theta 4 to 7 Hz alpha 8 to 13 Hz, Beta 13 Hz Between 1-2 MAC shift is towards decreased frequency. b-a-th-S 