The effect of water immersion on postural and visual orientation.

Abstract

The SHP and SVV perceptually dissociate on land and, as we determined for the first time, also under water. Water immersion leads to an increased roll tilt perception as measured by the SHP. However, a systematic influence on SVV could not be observed under water thus supporting the assumption that the SVV and SHP depend on gravitoreceptive information that is selectively altered during water immersion.