EEG typically involves analyzing amplitudes (powers) of activity in certain frequency ranges (bands). ThinkGear reports the relative power of each EEG band, typically at 1 second intervals.

• EEG Band Frequencies
• EEG Band Power Values and Meaning
• Classification of EEG Signals in a BrainComputer Interface System - An excellent thesis explaining how to use EEG/Brainwaves for BCI

For full details about the data types, including meanings and ranges, please download the free MDT and refer to the MindSet Communications Protocol (located in the tg/ directory).