Perception of self-motion in microgravity. Harris, L. R., Bansal, A., Jörges, B., Bury, N., McManus, M., Allison, R. S., & Jenkin, M. In Perception, Abstracts of the AVA Christmas Meeting. 2023.
Perception of self-motion in microgravity [link]-1  doi  abstract   bibtex   
When perception of self-motion is induced using only visual motion, vestibular cues indicate that the body is stationary which may bias an observer's perception. When lowering the reliability of the vestibular cue (such as when lying down) or functionally taking it away in microgravity these biases may decrease, accompanied by a decrease in precision. To test this hypothesis, we used a move-to-target task in virtual reality. Cohorts of astronauts (6 female, 6 male) and Earth-based controls (10 female, 10 male) were shown simulated targets at different distances. Each target then disappeared and self-motion induced by optic flow. Participants indicated when they thought they had arrived at the target's previously seen location. Astronauts completed the task on Earth (lying supine and sitting upright) prior to space travel, on twice in space onboard the International Space Station (within 3-6 days of arrival, after  85 days in space), and after landing (within 3-6 days of return and  85 days later). Controls completed the experiment on Earth using a similar regime with supine posture used to simulate being in space. While variability was similar across all conditions, astronauts displayed higher gains (target distance/perceived travel distance) when lying supine than when sitting upright in two out of the three terrestrial sessions. No difference could be detected between the astronauts' performance on Earth and onboard the ISS or between the controls' sessions. Despite the unusual floating mode of travel employed by astronauts, their performance in judging self-motion distance appears largely unaffected by exposure to microgravity.
@incollection{Harris:2023le,
	abstract = {When perception of self-motion is induced using only visual motion, vestibular cues indicate that the body is stationary which may bias an observer's perception. When lowering the reliability of the vestibular cue (such as when lying down) or functionally taking it away in microgravity these biases may decrease, accompanied by a decrease in precision. To test this hypothesis, we used a move-to-target task in virtual reality. Cohorts of astronauts (6 female, 6 male) and Earth-based controls (10 female, 10 male) were shown simulated targets at different distances. Each target then disappeared and self-motion induced by optic flow. Participants indicated when they thought they had arrived at the target's previously seen location. Astronauts completed the task on Earth (lying supine and sitting upright) prior to space travel, on twice in space onboard the International Space Station (within 3-6 days of arrival, after ~85 days in space), and after landing (within 3-6 days of return and ~85 days later). Controls completed the experiment on Earth using a similar regime with supine posture used to simulate being in space. While variability was similar across all conditions, astronauts displayed higher gains (target distance/perceived travel distance) when lying supine than when sitting upright in two out of the three terrestrial sessions. No difference could be detected between the astronauts' performance on Earth and onboard the ISS or between the controls' sessions. Despite the unusual floating mode of travel employed by astronauts, their performance in judging self-motion distance appears largely unaffected by exposure to microgravity.
},
	author = {Laurence R. Harris and Ambika Bansal and Bj{\"o}rn J{\"o}rges and Nils Bury and Meaghan McManus and Robert S. Allison and Michael Jenkin},
	booktitle = {Perception, Abstracts of the AVA Christmas Meeting},
	date-added = {2024-07-31 08:59:05 -0400},
	date-modified = {2024-07-31 08:59:05 -0400},
	doi = {10.1177/03010066241239296},
	keywords = {Optic flow & Self Motion (also Locomotion & Aviation)},
	title = {Perception of self-motion in microgravity},
	url-1 = {https://doi.org/10.1177/03010066241239296},
	year = {2023},
	bdsk-url-1 = {https://doi.org/10.1177/03010066241239296}}
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