<prompt> EEG with eyes closed, in normal alert adult predominantly showsAlpha wavesBeta wavesTheta wavesDelta waves  <response>: A Alpha waves Alpha waves are neural oscillations in the frequency range of 7.5-12.5 Hz arising from synchronous and coherent in phase or constructive electrical activity of thalamic pacemaker cells in humans. Alpha waves are one type of brain waves detected either by electro- encephalography EEG and predominantly originate from the occipital lobe during wakeful relaxation with closed eyes. 