Methods and devices for monitoring brain functions by magnetic field measuring of MEG signal via an ear cavity

An ear-based brain function monitoring device, comprising:

• a first magnetoresistance sensor positioned within a first enclosure and configured for detecting a magnetic field to measure magnetoencephalography (MEG) signals from a first ear cavity of a user, the magnetic field containing indications of brain function of the user;
• the first enclosure configured to magnetically shield the first magnetoresistance sensor from environmental magnetic noise, wherein the first enclosure has an opening through which the magnetic field from the first ear cavity enters the first enclosure to be detected by the first magnetoresistance sensor;
• a second magnetoresistance sensor positioned within a second enclosure and configured for detecting a second magnetic field from a second ear cavity, the second magnetic field containing second indications of the brain function of the user;
• and
• one or more processors coupled with the first magnetoresistance sensor and the second magnetoresistance sensor;
• and
• memory storing instructions for execution by the one or more processors, the stored instructions including instructions for:
• receiving, from the first magnetoresistance sensor, first signals indicating the magnetic field from the first ear cavity;
• receiving, from the second magnetoresistance sensor, second signals indicating the second magnetic field from the second ear cavity;
• comparing the magnetic field from the first ear cavity and the second magnetic field from the second ear cavity by comparing the first signals and the second signals;
• and
• monitoring the brain function of the user based on the comparing.