Abstract
We devised an apparatus utilizing the principle of a gyroscope to record head rota-tions in the vertical plane without mechanical restraint. However, the electro-oculographic (EOG) recording of vertical eye movements has several sources of error such as the presence of overshoot artifacts and the nonlinearity of the records. Those problems were not necessarily solved by letting the subject hold his upper eyelid with his own finger and recording EOG from an infraorbital electrode only. Thus, considerable further thought on eye movement measurements would be needed for analyzing the eye-head coordination in the vertical plane.
