Influence of combined visual and vestibular cues on human perception and control of horizontal rotation

Summary Measurements are made of manual control performance in the closed-loop task of nulling perceived self-rotation velocity about an earth-vertical axis. Self-velocity estimation is modeled as a function of the simultaneous presentation of vestibular and peripheral visual field motion cues. Based on measured low-frequency operator behavior in three visual field environments, a parallel channel linear model is proposed which has separate visual and vestibular pathways summing in a complementary manner. A dual-input describing function analysis supports the complementary model; vestibular cues dominate sensation at higher frequencies. The describing function model is extended by the proposal of a non-linear cue conflict model, in which cue weighting depends on the level of agreement between visual and vestibular cues.Research supported in part by NASA Grants NSG 2032 and 2230. GLZ supported by an NIH National Research Service Award. GLZ currently at Bolt Beranek and Newman, Inc., Cambridge, MA, USA