Journal
EXPERIMENTAL BRAIN RESEARCH
Volume 232, Issue 4, Pages 1185-1191Publisher
SPRINGER
DOI: 10.1007/s00221-014-3835-y
Keywords
Self-motion; Vection; Postural sway; Vision; Optic flow
Categories
Funding
- Australian Research Council Discovery Grant [DP0772398]
- Australian Research Council [DP0772398] Funding Source: Australian Research Council
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This study asked whether individual differences in the influence of vision on postural stability could be used to predict the strength of subsequently induced visual illusions of self-motion (vection). In the experiment, we first measured spontaneous postural sway while subjects stood erect for 60 s with their eyes both open and both closed. We then showed our subjects two types of self-motion display: radially expanding optic flow (simulating constant velocity forwards self-motion) and vertically oscillating radially expanding optic flow (simulating constant velocity forwards self-motion combined with vertical head oscillation). As expected, subjects swayed more with their eyes closed (compared to open) and experienced more compelling illusions of self-motion with vertically oscillating (as opposed to smooth) radial flow. The extent to which participants relied on vision for postural stability-measured as the ratio of sway with eyes closed compared to that with eyes open-was found to predict vection strength. However, this was only the case for displays representing smooth self-motion. It seems that for oscillating displays, other factors, such as visual-vestibular interactions, may be more important.
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