Average (± 1 StdDev) trial-to-trial variability of SHV (black circles) and SVV (gray squares; from ) from all subjects is shown as a function of head roll. Note that variability values are reported in a logarithmic scale. For both SVV and SHV, variability increased with increasing roll, peaked in the range of 120-150° and decreased again to intermediate values in upside-down orientation.
Schuler et al. BMC Neuroscience 2010 11:83 doi:10.1186/1471-2202-11-83