Intra-oral electroencephalography device and method

A mouthpiece comprising:

• a dentition attachment portion contoured to at least partially extend around and receive at least a partial upper portion of a dentition of a user, the dentition attachment portion having an occlusal surface, a buccal wall extending from the occlusal surface on a first side and a lingual wall extending from the occlusal surface on a second side, the buccal wall comprising a gum portion configured to be positioned adjacent the user's alveolar mucosa;
• and a plurality of EEG electrodes positioned on or embedded in the gum portion, the plurality of EEG electrodes comprising:
• a first EEG electrode and a third EEG electrode positioned on a right-side of the gum portion;
• and a second EEG electrode and a fourth EEG electrode positioned on a left-side of the gum portion, wherein each of the first EEG electrode, the second EEG electrode, the third EEG electrode, and the fourth EEG electrode is spaced apart from each other, the gum portion is configured such that when the mouthpiece is configured to be inserted in the user's oral cavity, each of the first EEG electrode, the second EEG electrode, the third EEG electrode, and the fourth EEG electrode is in contact with the user's alveolar mucosa such that the plurality of EEG electrodes detect brain wave signals through a maxillary bone of the user.