Abstract
When a person moves through the world, the associated visual displacement of the environment in the opposite direction is not usually seen as external movement but rather as a changing view of a stable world. We measured the amount of visual motion that can be tolerated as compatible with the perception of moving within a stable world during active, sinusoidal, translational and rotational head movement. Head movements were monitored by means of a low-latency, mechanical head tracker and the information was used to update a helmet-mounted visual display. A variable gain was introduced between the head tracker and the display. Ten subjects adjusted this gain until the visual display appeared stable during sinusoidal yaw, pitch and roll head rotations and naso-occipital, inter-aural and dorso-ventral translations at 0.5 Hz. Each head movement was tested with movement either orthogonal to or parallel with gravity. A wide spread of gains was accepted as stable (0.8 to 1.4 for rotation and 1.1 to 1.8 for translation). The gain most likely to be perceived as stable was greater than that required by the geometry (1.2 for rotation; 1.4 for translation). For rotational motion, the mean gains were the same for all axes. For translation there was no effect of whether the movement was inter-aural (mean gain 1.6) or dorso-ventral (mean gain 1.5) and no effect of the relative orientation of the translation direction relative to gravity. However translation in the naso-occipital direction was associated with more closely veridical settings (mean gain 1.1) and narrower standard deviations than in other directions. These findings are discussed in terms of visual and non-visual contributions to the perception of an earth-stable environment during active head movement.
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Acknowledgements
Supported by NASA Cooperative Agreement NCC9-58 with the National Space Biomedical Research Institute (NSBRI), the Centre for Research in Earth and Space Technology (CRESTech, Canada), the Canadian Space Agency (CSA) and the Natural Sciences and Engineering Research Council (NSERC, Canada). Thanks to Jeff Laurence for technical support.
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Jaekl, P.M., Jenkin, M.R. & Harris, L.R. Perceiving a stable world during active rotational and translational head movements. Exp Brain Res 163, 388–399 (2005). https://doi.org/10.1007/s00221-004-2191-8
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DOI: https://doi.org/10.1007/s00221-004-2191-8