The mean peak alpha frequency is 10.2 Hz and decreases in old age due to decreased cerebral perfusion leading to decreased cerebral metabolic rate. They are fairly regular pattern of waves at a frequency of 8 – 13 / sec and an amplitude of 50 – 100 pV. They disappear entirely during deep sleep. They disappear on opening the eyes and on attentive mind. They are most marked in the parietooccipital area of the scalp when the person is awake, quite and resting with eyes closed. Alpha waves are the most prominent component of the EEG. The main types of EEG waves are alpha, beta, theta and delta waves.
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