Any measurable or observable characteristic related to the motility of the cochlear OHCs in response to electrical stimulation; normally, the motile response (i.e. rapid change in length and stiffness of OHCs) is closely coupled to the changing transduction current and provides a region-specific amplification in the movement of the spiral organ that enhances transduction at the IHCs in that specific region of the cochlear spiral, increasing both sensitivity and specificity; electromotility is believed to arise through voltage-gated conformational changes in motor protein (prestin) or proteins located in the lateral wall of the OHC.