PROBLEM TO BE SOLVED: To provide a system for training for weakening an abnormal brain activity.SOLUTION: A brain activity training system 10 comprises a brain signal measurement device 100, an activity state estimation device 200 and a presentation device 300. The activity state estimation device 200 uses a first brain signal which is measured by the brain signal measurement device 100 which indicates a state of a brain activity of a user who performs a voluntary activity on a first portion of a body, and plural pieces of first portion activity information indicating the activity of the first portion, for creating a decorder 231 for estimating the activity of the first portion corresponding to the brain signal, then acquires a second brain signal indicating a state of the brain activity of the user who recalls a voluntary activity on a second portion of the body from the brain signal measurement device 100 and estimates the activity of the first portion corresponding to the second brain signal using the decorder 231, then presents the activity of the first portion which is estimated as the activity of the second portion to the user in a visual state through the presentation device 300.SELECTED DRAWING: Figure 6【課題】異常な脳活動を弱める訓練のためのシステムを提供する。【解決手段】脳信号計測装置１００、活動状態推定装置２００、及び提示装置３００を備える脳活動訓練システム１０において、活動状態推定装置２００は、身体の第１部位で随意的な活動をしているユーザの脳活動の状態を示す、脳信号計測装置１００が計測する第１脳信号、及び第１部位の活動を示す複数の第１部位活動情報を用いて、脳信号に対応する第１部位の活動を推定するためのデコーダ２３１を生成し、さらに、身体の第２部位の随意的な活動を想起しているユーザの脳活動の状態を示す第２脳信号を脳信号計測装置１００から取得しながら、第２脳信号に対応する第１部位の活動を、デコーダ２３１を用いて推定し、推定された第１部位の活動を前記第２部位の活動として提示装置３００を介してユーザに視覚的に提示する。【選択図】図６
