Effects of the somatic electrical circuit on spontaneous mechanical oscillations of inner ear hair bundles

Under \textit{in vitro} conditions, uncoupled hair bundles of the bullfrog (\textit{Rana catesbeiana}) sacculus have been shown to exhibit spontaneous oscillations. We used a high-speed complementary metal oxide semiconductor camera to track the movements of hundreds of cells in parallel from dozens of preparations. We found that innate bundle movements exhibit a complex profile with multiple periodicities. Experiments inhibiting the electrical resonance in the cell body show a strong effect on the mechanical oscillations of the hair bundles. This indicates that the electrical oscillation is coupled with the mechanical oscillations of the hair bundles.