Precision and Bias in the Perception of Object Size in Microgravity. Jorges, B, Bury, N., McManus, M, , B., Allison, R. S., Jenkin, M. R. M., & Harris, L. R. In International Multisensory Research Forum, pages 066. 2023. abstract bibtex Gravity influences the perception of size although the mechanism remains unclear. Some authors have suggested that gravity might serve as a reference frame for visual judgements. If so, then in the absence of this persistent frame of reference size judgements should be less precise in microgravity. Twelve astronauts (6 women and 6 men) were tested before space flight, within 6 days of arrival on the ISS, approximately 90 days after arrival, within 6 days of return to Earth, and more than 60 days after return. They judged the height of a visually fronto-parallel square presented in VR at 6, 12 and 18 m relative to a bar held in their hands aligned with the long axis of the body. The cube's height was varied trial to trial via an adaptive staircase. We found no significant differences in precision or bias between any of the space sessions and before they flew. However, when collapsing across test sessions, astronauts perceived the cube to be significantly larger in space than when upright (p = 0.01) or supine (p = 0.017) on Earth which was mainly driven by the cube being perceived as smaller (p = 0.002) after having been back on Earth for 60 days compared to their first session. The lack of effect of microgravity on precision makes it unlikely that the gravity-as-reference-frame hypothesis can explain posture-related perceptual size changes observed on Earth. However, space exposure does seem to create lasting changes in perceptual processing.
@incollection{Jorges:yg,
abstract = {Gravity influences the perception of size although the mechanism remains unclear. Some authors have suggested that gravity might serve as a reference frame for visual judgements. If so, then in the absence of this persistent frame of reference size judgements should be less precise in microgravity. Twelve astronauts (6 women and 6 men) were tested before space flight, within 6 days of arrival on the ISS, approximately 90 days after arrival, within 6 days of return to Earth, and more than 60 days after return. They judged the height of a visually fronto-parallel square presented in VR at 6, 12 and 18 m relative to a bar held in their hands aligned with the long axis of the body. The cube's height was varied trial to trial via an adaptive staircase. We found no significant differences in precision or bias between any of the space sessions and before they flew. However, when collapsing across test sessions, astronauts perceived the cube to be significantly larger in space than when upright (p = 0.01) or supine (p = 0.017) on Earth which was mainly driven by the cube being perceived as smaller (p = 0.002) after having been back on Earth for 60 days compared to their first session. The lack of effect of microgravity on precision makes it unlikely that the gravity-as-reference-frame hypothesis can explain posture-related perceptual size changes observed on Earth. However, space exposure does seem to create lasting changes in perceptual processing.},
annote = {June 27-30/ 2023 in Brussels},
author = {Jorges, B and Bury, N. and McManus, M and , Bansal, A. and Allison, R. S. and Jenkin, M. R. M. and Harris, L. R.},
booktitle = {International Multisensory Research Forum},
date-added = {2023-08-13 09:21:09 -0400},
date-modified = {2023-08-13 09:21:09 -0400},
keywords = {Optic flow & Self Motion (also Locomotion & Aviation)},
pages = {066},
title = {Precision and Bias in the Perception of Object Size in Microgravity},
year = {2023}}
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They judged the height of a visually fronto-parallel square presented in VR at 6, 12 and 18 m relative to a bar held in their hands aligned with the long axis of the body. The cube's height was varied trial to trial via an adaptive staircase. We found no significant differences in precision or bias between any of the space sessions and before they flew. However, when collapsing across test sessions, astronauts perceived the cube to be significantly larger in space than when upright (p = 0.01) or supine (p = 0.017) on Earth which was mainly driven by the cube being perceived as smaller (p = 0.002) after having been back on Earth for 60 days compared to their first session. The lack of effect of microgravity on precision makes it unlikely that the gravity-as-reference-frame hypothesis can explain posture-related perceptual size changes observed on Earth. 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