Fig. 14.

Coherence zone between visual and vestibular stimuli. For a given visual stimulus, there will be an upper and lower limit of vestibular stimulus amplitude which is perceived as coherent with the visual stimulus. The coherence zone width (CZW) is the difference between these two limits, and the point of mean coherence (PMC) is defined as the point halfway between the limits. The gain of mean coherence (GMC) is defined as the ratio of the vestibular amplitude to the visual amplitude at the PMC and represents the preferred gain between the visual and vestibular cues