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Rotational axis of the eye in the frontal plane calculated from the velocity step data, in the canal-plugged state (gray diamonds) and during the first period of low-sensitivity prosthetic stimulation (black diamonds). The axis is defined as the tan−1 (peak horizontal eye velocity/peak vertical eye velocity). A purely horizontal eye movement response, which is perfectly compensatory for the yaw-axis head rotation, has an axis of 90° and a purely vertical response has an axis of 0°.
