Before revision:  By varying the Calcium concentration and the viscosity of the Endolymph solution , we are able to modulate the degree of chaos  in the hair cell dynamics . We find that the hair cell is most sensitive to a stimulus of small amplitude when it is poised in the weakly chaotic regime.
After revision:  By varying the Calcium concentration and the viscosity of the Endolymph solution , we are able to modulate the degree of chaos in the hair bundle dynamics in vitro. We consistently find that the hair cell is most sensitive to a stimulus of small amplitude when it is poised in the weakly chaotic regime.