Brainwaves. Abstract computer artwork showing a human brain, with a stopwatch superimposed and spiked EEG (electroencephalogram) brainwaves. At lower frame is the repeated profile of a human head with brain, seen on a starfield. The red brainwaves may be depicting a thought pattern or some mental state. Brainwaves are electrical impulses produced by the activity of the brain when measured on an EEG machine.