<prompt> Which waves is predominantly seen in EEG with eyes closed in normal alert adult?Alpha wavesBeta wavesTheta wavesDelta waves  <response>: Ans. A. Alpha wavesBandFrequency HzLocation NormallyDelta4frontally in adults, posteriorly in children; high-amplitude waves adult slow-wave sleep in babiesTheta4-7Found in locations not related to task at hand higher in young children drowsiness in adults and teensAlpha8-15posterior regions of head, both sides, higher in amplitude on dominant side. relaxedreflecting closing the eyesBeta16-31both sides, symmetrical distribution, most evident frontally; low-amplitude waves range span: active calm - intense - stressed - mild obsessive active thinking, focus, high alert, anxiousGamma32Somatosensory cortex Displays during cross-modal sensory processing perception that combines two different senses, such as sound and sight Also is shown during short-term memory matching of recognized objects, sounds, or tactile sensations 