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[[File:Seizure_EEG.jpg|frame|EEG of a patient that experiences a seizure. The effect is obvious.]]
The term Brain wave has multiple meanings. For our purposes, we will be using it as the layman's term to describe the fields detected via Electroencephalography (EEG). There are 6 main wave patterns listed from lowest to highest frequency with main characteristics <ref> Niedermeyer E. and da Silva F.L. (2004). Electroencephalography: Basic Principles, Clinical Applications, and Related Fields. Lippincot Williams & Wilkins. ISBN 0-7817-5126-8. </ref> :
The term Brain wave has multiple meanings. For our purposes, we will be using it as the layman's term to describe the fields detected via Electroencephalography (EEG). There are 6 main wave patterns listed from lowest to highest frequency with main characteristics <ref> Niedermeyer E. and da Silva F.L. (2004). Electroencephalography: Basic Principles, Clinical Applications, and Related Fields. Lippincot Williams & Wilkins. ISBN 0-7817-5126-8. </ref> :
− *Delta waves (<4Hz). Seen during the slow sleep phase of sleep, as well as with certain brain abnormalities. Not useful for C-BCI purposes.
*Delta waves (<4Hz). Seen during the slow sleep phase of sleep, as well as with certain brain abnormalities. Not useful for C-BCI purposes.
*Theta waves (4-7Hz). Seen more rarely with increasing age, associated with meditative, tired and relaxed states.
*Theta waves (4-7Hz). Seen more rarely with increasing age, associated with meditative, tired and relaxed states.