Beta is waves centered on 15Hz and reflects desynchronised active brain tissue. The highest frequency band is called gamma and contains waves of 35Hz and up. This picture shows a combination of EEG traces from across the head plus a slice from these same data in map form, emphasising the topography of a wave. Applications Anaesthesia and Epilepsy monitoring More information on EEG and Anaesthesia is available on-line Alertness, Sleep, and Arousal. Below are two graphs depicting a novel way to display EEG information and alertness data.
People sometimes have lapses of attention related to low alertness.
Learn more at Scott Makeig's site where this paper is located Figure 2b. ERPs are event related potentials. To easily understand this concept, think of a stimulus - say a simple tone. If we recorded the brain activity following the presentation of this tone, we woudl have recorded a brain evoked potential. Fortunately, with modern computers it is trivial to average the responses of the brain into AEPs A veraged E voked P otentials.