Chimera states and frequency clustering in systems of coupled inner-ear hair cells

TL;DR

This study demonstrates the emergence of chimera states and frequency clustering in coupled hair cells, revealing their potential role in auditory sensitivity and synchronization phenomena.

Contribution

It introduces an experimental and numerical model showing chimera states in coupled hair cells, highlighting their sensitivity at the edge of synchronization.

Findings

Chimera states and frequency clustering observed in vitro.

Model reproduces these states with parameter heterogeneity.

System is most sensitive to external signals at the onset of synchronization.

Abstract

Coupled hair cells of the auditory and vestibular systems perform the crucial task of converting the energy of sound waves and ground-borne vibrations into ionic currents. We mechanically couple groups of living, active hair cells with artificial membranes, thus mimicking in vitro the coupled dynamical system. We identify chimera states and frequency clustering in the dynamics of these coupled nonlinear, autonomous oscillators. We find that these dynamical states can be reproduced by our numerical model with heterogeneity of the parameters. Further, we find that this model is most sensitive to external signals when poised at the onset of synchronization, where chimera and cluster states are likely to form. We therefore propose that the partial synchronization in our experimental system is a manifestation of a system poised at the verge of synchronization with optimal sensitivity.