Figure 4.

Oscillatory profiles of hair cells over the parameter space of the maximal slipping rate (S_max) and the slope of the stiffness change (K_gs1). The diagram shows various states of the hair bundle: stable (i.e., nonoscillating), oscillating with regular patterns (i.e., single-mode oscillation), or showing complex bursting-type behavior (i.e., multimode oscillation). Examples of the oscillations with different parameter values are shown in the insets located in regions that correspond to their parameters values. The horizontal scale bar indicates 0.2-s time interval for all of the oscillations shown. The displacement of each oscillation is independently scaled. Note that the two nonoscillating regions are due to different stabilities: in the low-S_max region, most of the channels stay open, and in the high-S_max region, most of the channels remain closed. Regimes that show single-mode oscillation likewise show different patterns, though no sharp transition exists at high K_gs1. The region with S_max higher than that of the multimode oscillation region shows spikelike profiles with periodicity determined by the quiescent interval and the region with lower S_max shows only fast component of the oscillations.