The nerve's ability to transmit signals is tested by inserting recording electrodes to capture the data, and signal electrodes to initiate signals down a nerve by applying a small shock.
Bipolar stimulation is generated at the stylomastoid foramen, while the recording electrodes are attached at the terminal ends of the nerve near the nose.
In the presence of bundle branch block or ventricular hypertrophy, the depolarization impulse takes a longer than normal period of time to reach the recording electrode.
Meanwhile, any extracellular voltage change across the mote's two recording electrodes -- generated by nerve activity modulates the transistor's gate, which changes the current flowing between the terminals of the crystal.