title: Dynamics of freely oscillating and coupled hair cell bundles under mechanical deflection.
abstract: In vitro, attachment to the overlying membrane was found to affect the resting position of the hair cell bundles of the bullfrog sacculus. To assess the effects of such a deflection on mechanically decoupled hair bundles, comparable offsets were imposed on decoupled spontaneously oscillating bundles. Strong modulation was observed in their dynamic state under deflection, with qualitative changes in the oscillation profile, amplitude, and characteristic frequency of oscillation seen in response to stimulus. Large offsets were found to arrest spontaneous oscillation, with subsequent recovery upon reversal of the stimulus. The dynamic state of the hair bundle displayed hysteresis and a dependence on the direction of the imposed offset. The coupled system of hair bundles, with the overlying membrane left on top of the preparation, also exhibited a dependence on offset position, with an increase in the linear response function observed under deflections in the inhibitory direction.
authors: Department of Physics and Astronomy, University of California, Los Angeles, California, USA.
authors: Lea
authors: L
authors: Fredrickson-Hemsing
authors: C Elliott
authors: CE
authors: Strimbu
authors: Yuttana
authors: Y
authors: Roongthumskul
authors: Dolores
authors: D
authors: Bozovic
mesh_terms: D000818:Animals; D001696:Biomechanical Phenomena; D006198:Hair Cells, Auditory / Q000166:cytology* / Q000378:metabolism; D016014:Linear Models; D055595:Mechanical Phenomena; D008954:Models, Biological; D009068:Movement; D010037:Otolithic Membrane / Q000166:cytology / Q000378:metabolism; D011892:Rana catesbeiana; D012444:Saccule and Utricle / Q000166:cytology