Abstract
Auditory system is known for its exquisite sensitivity with sub-nanometer detection thresholds. Mechanical deflections due to external sound and ground vibrations are converted by inner ear hair cells into electrical signals. In some species, hair cell's stereociliary bundles exhibit spontaneous oscillations under in vitro conditions, a behavior that has been successfully reproduced by numerical models based on nonlinear dynamics. In this work, we study both numerically and experimentally the dynamics of individual hair bundles from the Bullfrog sacculus, at threshold levels of stimulation to elucidate the mechanisms underlying the sensitivity of detection by the sacculus. We measure the steady state response to small sinusoidal stimuli, as well as the time course of the phase locking transition in spontaneously oscillating bundles.
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