[Parity principle and kinematic asymmetries in the otolith system]

Using a mathematical model, otolith stimulation in response to man's movements in a system rotating with a constant angular velocity was examined. Man moved his head or body forward or sideward obeying the trapezoidal rule. The resulting accelerations that acted upon the left and right otoliths were determined. The existence of two otoliths that are symmetrical relative to the sagittal plane was found to be responsible for the left-right asymmetry that accompanied movements in the rotating system, the asymmetry being most distinct during tilts to the left or to the right.