Sensors to determine neuronal activity of an organism to facilitate a human-machine interface

An apparatus comprising:

• an array of neuronal activity sensors adapted to conform to a portion of head adjacent a portion of a brain to detect a subset of neuronal activity types, the array of neuronal activity sensors comprising;
• a subset of neuronal activity sensors, each of which comprises:
• one or more electrodes configured to impart an electric field into a plurality of biological tissues;
• and one or more magnetic field elements configured to receive a magnetic field associated with the electric field;
• and
• a neuronal sensor transceiver configured to selectably drive a stimulus signal in association with the one or more electrodes to generate the electric field and further configured to receive a response signal that includes data representing an amount of neuron activity;
• and
• a physiological activity processor configured to extract the data representing an amount of neuron activity from the response signal and to determine a neuronal state,
• wherein the one or more magnetic field elements comprise:
• a first coil having a first diameter and a winding in a first direction;
• a second coil having a second diameter and a winding in a second direction,
• wherein one of the first coil and the second coil is configured to generate an induced current to cancel another induced current generated by the other of the first coil and the second coil to facilitate determination of the neuronal state associated with the portion of the brain.