US Patent 9215978 Systems and methods to gather and analyze electroencephalographic data

Example methods are described herein that include obtaining electroencephalographic data from an example device worn by a subject. The device includes a central body portion and a plurality of extensions extending from the central body portion. Respective ones of the extension have ends carrying an electrode. The example device includes an adjustment band disposed along a longitudinal axis of the central body portion to adjust a position of the extensions. The example method also includes analyzing the data to determine a mental state of the subject.