Five Major Brain Waves
Five major brain waves can be distinguished by their frequency ranges:
|frequency band|frequency range|
|—–|—-|—-|
|delta|0.5-4Hz|appears for continuous-attention tasks|
|theta|4-8Hz|spikes when repressing(抑制) a response or action|
|alpha|8-13Hz|measures relax or closing eyes|
|beta|13-30Hz|reflects active thinking,focus,high alert or anxiety|
|gamma|30-50Hz|displays during cross-modal sensory processing|