< Topic >The magnetoencephalography of the subject who installs the artificial inner ear device is measured.SolutionsMagnet D of the artificial inner ear device, in gurajiometa the data for signal detection which is obtained with duplex gurajiometa 10 which installs with gurajiometa 2 for reference where the magnetic field detection sensitivity for the current source C inside the brain which originates 1 for signal detection where the magnetic field detection sensitivity for I am minimum and hearing is minimum, in the identical coil bobbin and gurajiometa 1 for signal detection and the data for reference which is obtained with gurajiometa 2 for reference summation adding, it possesses the operation means 24 which seek the signal data.< Advantages >A being audible state in the subject who installs the artificial inner ear device can be inspected objectively.< Choice figure >Drawing 7【課題】人工内耳装置を装着した被験者の脳磁場を測定する。【解決手段】人工内耳装置の磁石D,Iに対する磁場検出感度が極小である信号検出用グラジオメータ1と、聴覚に起因する脳内の電流源Cに対する磁場検出感度が極小であるレファレンス用グラジオメータ2とを、同一のコイルボビンに装着した2重グラジオメータ10と、信号検出用グラジオメータ1で得た信号検出用データとレファレンス用グラジオメータ2で得たレファレンス用データとを加重加算して信号データを求める演算手段24を具備する。【効果】人工内耳装置を装着した被験者における聞こえ状態を客観的に検査できる。【選択図】図7
