Beta: high-frequency wMMwwwwwwMwwww but low amplitude alpha waves seen in deep sleep or persons attention is directed be eta to some specific type of mental activity *wwMwwwr Strongest from parietal and frontal theta obes produced by visual stimuli and mental activity delta -14-30Hz 5-20μV 1 second interval (b)Beta: high-frequency but low amplitude waves seen in deep sleep or person’s attention is directed to some specific type of mental activity –Strongest from parietal and frontal lobes •Produced by visual stimuli and mental activity. –14-30 Hz –5-20  V