Brain-Computer Interfaces (BCI) research are emerging in the last few years providing non-invasive, wireless and low-cost ElectroEncephaloGraphy (EEG) devices. Scientific papers are published almost every day providing new BCI solutions. Follow this evolution with a readout accessible to everyone.
Tuesday, April 03, 2012
EEG Frequency Bands
EEG waveforms are generally classified according to their frequency, amplitude and shape, as well as the location on the scalp at which they are recorded:
0.5 - 3 Hz: Delta = Deep Sleep
4 - 7 Hz: Theta = Light Sleep
8 - 13 Hz: Alpha = Awake and Relaxed
14 - 30 Hz: Beta = Awake and Excited
The next table shows the location and state associated to the most familiar classification used for EEG waveform frequency.