Vestibularly evoked potentials (VESTEPs) of the horizontal semicircular canals under different body positions in space.

We recorded vestibularly evoked potentials (VESTEPs) using natural vestibular stimuli simulating the form of a normal head movement ("raised cosine"). Its smooth course was designed to minimize all possible sources of artifacts of mechanical, electrical, and physiological origin. This motion profile was applied to subjects (Ss) sitting upright, thus stimulating the horizontal semicircular canals alone, as well as when they were tilted in different positions in steps of 30 degrees about the interaural y-axis, which had the effect of modulating the otolithic contribution to the horizontal VESTEP.