What inherent physical quality of the base segments of the basilar membrane dictates the maximum frequency humans can hear?

Answer

Their inherent physical stiffness

The maximum frequency limit is fundamentally constrained by the physical stiffness of the base segments of the basilar membrane; these structures cannot oscillate fast enough to generate a proper neural signal for frequencies beyond this limit.

What inherent physical quality of the base segments of the basilar membrane dictates the maximum frequency humans can hear?
humanrangelimitSoundhearing