Alpha waves were long ignored, but gained interest of brain researchers recently. Electrical activity of groups of brain cells results in brain waves with different amplitudes. The so-called alpha wave, a slow brain wave with a cycle of 100 milliseconds, seems to play a key role in suppressing irrelevant brain activity. Researchers recently discovered that when distracting information can be anticipated in time there is an increase of the power of this alpha wave just before the distracter. Furthermore, the brain is able to precisely control the alpha wave so that the pulse of inhibition is maximal when the distracter appears.