The perception of visually simulated self-motion is altered by body posture. Jörges, B., Bury, N., MacManus, M., Allison, R. S., Jenkin, M., & Harris, L. R. In 3rd Interdisciplinary Navigation (iNAV2020) Symposium Proceedings, pages 64. 2020. ![The perception of visually simulated self-motion is altered by body posture [pdf]](https://bibbase.org/img/filetypes/pdf.svg "pdf")
Paper -1 abstract bibtex The perception of visually simulated self-motion is altered by body posture Author(s) and affiliation(s): Björn Jörges, Nils Bury, Meaghan McManus, Robert Allison, Michael Jenkin, Laurence R. Harris Center for Vision Research, York University, 4700 Keele Street, Toronto, ON M3J 1P3, Canada The perception of self-motion is a multisensory process involving visual and vestibular cues, among others. Visual cues may become more important in visual-vestibular tasks when vestibular cues are attenuated, for example in determining the perceptual upright while lying supine[1]. We tested whether this effect might generalize to self-motion perception, where a higher effectiveness of visual cues should lead to an overestimation of traveled distance. We immersed participants in a virtual hallway and showed them targets at different distances ahead of them. The targets disappeared and participants experienced optic flow simulating straight-ahead self-motion. They indicated by button press when they felt they had reached the position of the target previously viewed. Participants also performed a control task to assess biases in depth perception. We showed them virtual boxes at different distances and they judged on each trial if the height of the box was bigger or smaller than a ruler in their hands. Perceived distance can be deduced from biases in perceived size. They performed both tasks sitting upright and lying supine. For the main task, we found that participants needed less optic flow to perceive they had reached the target's position when supine than when sitting (by 4.4%, 95% CI=[2.9%;6.3%], using Mixed Modelling). For the control task, participants underestimated the distance slightly less when supine (by 2.5%, 95% CI = [0.05%;5.00%], as above). When supine, participants needed to travel less far compared to sitting, even though they overestimated distance while supine versus sitting. The bias in traveled distance can thus not be reduced to a bias in perceived distance. Our experiment provides evidence that visual information is more important for the perception of self-motion when gravity is not aligned with the long body axis. We acknowledge the generous support of the Canadian Space Agency (15ILSRA1-York). [1] Dyde et al. (2006) Exp Brain Res 173:612–22 Name of corresponding author: Bjoern Joerges E-mail of corresponding author: bjoerges@yorku.ca
@incollection{Jorges:aa,
abstract = {The perception of visually simulated self-motion is altered by body posture Author(s) and affiliation(s): Bj{\"o}rn J{\"o}rges, Nils Bury, Meaghan McManus, Robert Allison, Michael Jenkin, Laurence R. Harris Center for Vision Research, York University, 4700 Keele Street, Toronto, ON M3J 1P3, Canada
The perception of self-motion is a multisensory process involving visual and vestibular cues, among others. Visual cues may become more important in visual-vestibular tasks when vestibular cues are attenuated, for example in determining the perceptual upright while lying supine[1]. We tested whether this effect might generalize to self-motion perception, where a higher effectiveness of visual cues should lead to an overestimation of traveled distance. We immersed participants in a virtual hallway and showed them targets at different distances ahead of them. The targets disappeared and participants experienced optic flow simulating straight-ahead self-motion. They indicated by button press when they felt they had reached the position of the target previously viewed. Participants also performed a control task to assess biases in depth perception. We showed them virtual boxes at different distances and they judged on each trial if the height of the box was bigger or smaller than a ruler in their hands. Perceived distance can be deduced from biases in perceived size. They performed both tasks sitting upright and lying supine. For the main task, we found that participants needed less optic flow to perceive they had reached the target's position when supine than when sitting (by 4.4\%, 95\% CI=[2.9\%;6.3\%], using Mixed Modelling). For the control task, participants underestimated the distance slightly less when supine (by 2.5\%, 95\% CI = [0.05\%;5.00\%], as above). When supine, participants needed to travel less far compared to sitting, even though they overestimated distance while supine versus sitting. The bias in traveled distance can thus not be reduced to a bias in perceived distance. Our experiment provides evidence that visual information is more important for the perception of self-motion when gravity is not aligned with the long body axis. We acknowledge the generous support of the Canadian Space Agency (15ILSRA1-York). [1] Dyde et al. (2006) Exp Brain Res 173:612--22 Name of corresponding author: Bjoern Joerges E-mail of corresponding author: bjoerges@yorku.ca },
annote = {Oct 5-7, 2020 virtual meeting},
author = {Bj{\"o}rn J{\"o}rges and Nils Bury and Meaghan MacManus and Robert S. Allison and Michael Jenkin and Laurence R. Harris},
booktitle = {3rd Interdisciplinary Navigation (iNAV2020) Symposium Proceedings},
date-added = {2020-10-27 13:50:05 -0400},
date-modified = {2020-10-27 13:50:05 -0400},
keywords = {Optic flow & Self Motion (also Locomotion & Aviation)},
pages = {64},
title = {The perception of visually simulated self-motion is altered by body posture},
url = {https://inavsymposium.com/wp-content/uploads/2020/10/Data_Blitz_Booklet_2020.pdf},
year = {2020},
url-1 = {https://inavsymposium.com/wp-content/uploads/2020/10/Data_Blitz_Booklet_2020.pdf}}
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We tested whether this effect might generalize to self-motion perception, where a higher effectiveness of visual cues should lead to an overestimation of traveled distance. We immersed participants in a virtual hallway and showed them targets at different distances ahead of them. The targets disappeared and participants experienced optic flow simulating straight-ahead self-motion. They indicated by button press when they felt they had reached the position of the target previously viewed. Participants also performed a control task to assess biases in depth perception. We showed them virtual boxes at different distances and they judged on each trial if the height of the box was bigger or smaller than a ruler in their hands. Perceived distance can be deduced from biases in perceived size. They performed both tasks sitting upright and lying supine. For the main task, we found that participants needed less optic flow to perceive they had reached the target's position when supine than when sitting (by 4.4%, 95% CI=[2.9%;6.3%], using Mixed Modelling). For the control task, participants underestimated the distance slightly less when supine (by 2.5%, 95% CI = [0.05%;5.00%], as above). When supine, participants needed to travel less far compared to sitting, even though they overestimated distance while supine versus sitting. The bias in traveled distance can thus not be reduced to a bias in perceived distance. Our experiment provides evidence that visual information is more important for the perception of self-motion when gravity is not aligned with the long body axis. We acknowledge the generous support of the Canadian Space Agency (15ILSRA1-York). [1] Dyde et al. 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