PROBLEM TO BE SOLVED: To improve detection accuracy of event-related desynchronization of a brain wave generated in a reflection of exercise intention.SOLUTION: A determination system includes: a head electrode disposed at the head on the left side of the body of a user when acquiring an intention of exercise of a region belonging to the right side of the body of the user, and disposed at the head on the right side of the body of the user when acquiring an intention of exercise of a region belonging to the left side of the body of the user； an ear hole electrode disposed in the ear hole of the user； a brain wave signal measurement instrument for acquiring a voltage between the head electrode and the ear hole electrode； and a determiner for determining whether or not an intention of exercise of the region belonging to the right side of the body of the user or the region belonging to the left side of the body of the user is included in a change in the voltage.SELECTED DRAWING: Figure 12【課題】運動企図を反映して発生する脳波の事象関連脱同期の検出精度を向上させる。【解決手段】ユーザの右半身に属する部位の運動の意図を取得する場合には、前記ユーザの左半身の頭部に配置され、前記ユーザの左半身に属する部位の運動の意図を取得する場合には、前記ユーザの右半身の頭部に配置される、頭部電極と、前記ユーザの耳穴に配置される耳穴電極と、前記頭部電極と前記耳穴電極の間の電圧を、取得する脳波信号計測器と、前記電圧の変化に前記ユーザの右半身に属する部位又は前記ユーザの左半身に属する部位の運動の意図が含まれるか否かを判定する判定器とを備える、判定システム。【選択図】図１２
