Sensitivity to vection may influence astronauts' perception of visually created gravity in space. McManus, M., Joerges, B., Bury, N., Bansal, A., Allison, R. S., Jenkin, M., & Harris, L. R. In 2024 Canadian Space Health Research Symposium, pages 8. 2024. ![Sensitivity to vection may influence astronauts' perception of visually created gravity in space [pdf]](https://bibbase.org/img/filetypes/pdf.svg "pdf")
-1 abstract bibtex The vestibular signal provided by the otoliths is inherently ambiguous as they respond to all linear accelerations. One source of linear acceleration can be misperceived as another as in centrifugation where centrifugal acceleration is misperceived as body tilt. Here we ask whether visually simulated linear motion down a virtual reality corridor might also lead to a misperception of body tilt. If so, then after viewing accelerating optic flow, a (simulated) floor should appear tilted. If constant velocity optic flow is viewed instead no tilt should be observed. We visually translated twelve astronauts down such a virtual corridor at 0.8ms2 or 4ms before, during, and after exposure to microgravity on the ISS. On Earth, we recorded whether they experienced the sensation of vection (illusory self-motion) when viewing such motion. If astronauts felt that they were actually moving instead of just viewing optic flow, they might be less likely to misinterpret the translation as tilt. Exposure to microgravity led to a small increase in the perceived tilt of the floor when viewing constant velocity but not acceleration. Additionally, we found an overall effect of vection experience on the amount astronauts tilted the floor after viewing constant velocity: when no vection was felt the floor there was also an increase in the perceived tilt of the floor compared to when vection was felt (p= 0.014, mean difference: 0.76$\,^{∘}$). No effects of vection were found when viewing acceleration.
@incollection{McManus:2024il,
abstract = {The vestibular signal provided by the otoliths is inherently ambiguous as they respond to all
linear accelerations. One source of linear acceleration can be misperceived as another as in
centrifugation where centrifugal acceleration is misperceived as body tilt. Here we ask
whether visually simulated linear motion down a virtual reality corridor might also lead to a
misperception of body tilt. If so, then after viewing accelerating optic flow, a (simulated)
floor should appear tilted. If constant velocity optic flow is viewed instead no tilt should be
observed. We visually translated twelve astronauts down such a virtual corridor at 0.8ms2
or 4ms before, during, and after exposure to microgravity on the ISS. On Earth, we recorded
whether they experienced the sensation of vection (illusory self-motion) when viewing such
motion. If astronauts felt that they were actually moving instead of just viewing optic flow,
they might be less likely to misinterpret the translation as tilt. Exposure to microgravity led
to a small increase in the perceived tilt of the floor when viewing constant velocity but not
acceleration. Additionally, we found an overall effect of vection experience on the amount
astronauts tilted the floor after viewing constant velocity: when no vection was felt the floor
there was also an increase in the perceived tilt of the floor compared to when vection was
felt (p= 0.014, mean difference: 0.76$\,^{\circ}$). No effects of vection were found when viewing
acceleration.},
annote = {The 2024 symposium is scheduled to take place from november 6-8 at Western University (London, ON, canada).
Best poster award},
author = {Meaghan McManus and Bjoern Joerges and Nils Bury and Ambika Bansal and Robert S. Allison and Michael Jenkin and Laurence R. Harris},
booktitle = {2024 Canadian Space Health Research Symposium},
date-added = {2024-11-20 10:24:09 -0500},
date-modified = {2024-11-20 10:24:09 -0500},
keywords = {Optic flow & Self Motion (also Locomotion & Aviation)},
pages = {8},
title = {Sensitivity to vection may influence astronauts' perception of visually created gravity in space},
url-1 = {https://www.canadianspacehealth.ca/_files/ugd/1f82d8_6b8a043d372c4b099cd278518885ee74.pdf},
year = {2024}}
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We visually translated twelve astronauts down such a virtual corridor at 0.8ms2 or 4ms before, during, and after exposure to microgravity on the ISS. On Earth, we recorded whether they experienced the sensation of vection (illusory self-motion) when viewing such motion. If astronauts felt that they were actually moving instead of just viewing optic flow, they might be less likely to misinterpret the translation as tilt. Exposure to microgravity led to a small increase in the perceived tilt of the floor when viewing constant velocity but not acceleration. Additionally, we found an overall effect of vection experience on the amount astronauts tilted the floor after viewing constant velocity: when no vection was felt the floor there was also an increase in the perceived tilt of the floor compared to when vection was felt (p= 0.014, mean difference: 0.76$\\,^{∘}$). 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