Electric device for measuring EEG signal or electric stimulation

An electric device for measuring an Electroencephalogram (EEG) signal from a subject's head and for providing electric stimulation to the subject's head, the electric device comprising:

• a plurality of electrode units configured to be attached to each different position of the head of the subject, and configured to
• detect the EEG signal from the subject's head, and
• supply electric current to the each different position, each of the plurality of electrode units including a plurality of microelectrodes forming an electric array;
• an electric stimulation unit configured to supply electric current in order to provide the electric stimulation to the subject's head;
• a switching unit connected to the electric stimulation unit and the plurality of electrode units, and configured to switch
• the each of the plurality of electrode units to be selectively connected and
• each of the plurality of microelectrodes to be selectively connected;
• and
• a controller connected to the switching unit, and configured to
• control the switching unit to be selectively connected to each of the plurality of the electrode units to receive the EEG signal from the subject's head through connected electrode unit among the plurality of electrode units, and
• control the switching unit to selectively supply, through the switching unit and the connected electrode unit, the electric current from the electric stimulation unit to the subject's head,
• wherein the controller is configured to control the switching unit to supply the electric current from the electric stimulation unit to the subject's head through the each of the plurality of the microelectrodes, and
• wherein the controller is configured to
• receive a first plurality of EEG signals detected from a first plurality of microelectrodes included in first electrode unit among the plurality of electrode units,
• select at least one microelectrode, which is configured to simultaneously receive the EEG signal from the subject's head and supply the electric current to the subject's head, from the first plurality of microelectrodes based on the received first plurality of EEG signals,
• receive a first EEG signal from the subject's head through the selected at least one microelectrode among the first plurality of microelectrodes, and
• control, at the same time as receiving the first EEG signal, the switching unit to supply the electric current to the subject's head through the selected at least one microelectrode.