Clinical tests that allow us to discriminate between utricular, saccul
ar and somatic effects on gravity perception and control are desirable
but wanting. A new test battery is presented which combines four expe
rimental paradigms based on the subjective horizontal body position (S
HP), namely, a test on a tiltable board and on a sled centrifuge under
varied leg position, with two paradigms based on the subjective visua
l vertical (SVV). It is shown by a combination of experiments and dedu
ctions, that, why, and how these tests can separate the effects of oto
liths from those of somatic graviceptors, the effects of the utricles
from those of the saccules, and the effects of the constituents of the
somatic graviception from each other. The present study demonstrates
the capabilities of the tests as well as their limitations.