  Body sway responses evoked by a horizontal acceleration of a level and firm
support surface are particular in that the vestibular information on body-space
angle BS resembles the proprioceptive information on body-foot angle BF. We
compared corresponding eyes-closed responses of vestibular-able (VA) and
vestibular-loss (VL) subjects, postulating a close correspondence. In
contradistinction to previous studies, we used an unpredictable (pseudorandom)
stimulus and found that the eyes-closed and eyes-open responses of the VA
closely resembled those of the VL subjects, as expected. We further conclude
that the vestibular signals coding head linear translation in VA subjects has
in this case too little functional relevance to cause a notable difference
between the subject groups.
