Figure 1 - Scheme for measuring the amplitude-phase characteristics of a harmonic signal when current passes through the tissues of the vestibular organ. The numbers indicate the location of the stimulating electrodes in the ampullas of the semicircular canals: 

1 – anterior; 2 – horizontal; 3 – posterior; 4 – near the otolith macules; 5 – recording electrode on the vestibular nerve