The CSA VECTION project: interpreting visual acceleration in a micro-g environment. Harris, L. R., Jenkin, M. R., Allison, R. S., McManus, M., & Bury, N. In CASI Aero 2018, Quebec, Canada May 15-17, 2018, pages 69-70. 2018.
abstract   bibtex   
Physical linear acceleration experienced in micro-g can be misinterpreted as gravity and induce a sense of tilt (Clément et al. 2001. EBR 138: 410). Previous studies have suggested that visual acceleration may be more effective at inducing self-motion (vection) in micro-g and furthermore that perceived distance may be underestimated in these environments. The VECTION project will in the micro-g of the ISS: (1) quantify how much self-motion is evoked by visual acceleration; (2) investigate whether visual acceleration can be interpreted as gravity; and (3) exploit size-distance invariance hypothesis to assess the perception of distance. Forwards vection will be created using constant-acceleration (0.8m/s/s) translation down a virtual corridor presented to astronauts using a head-mounted display (HMD). We will assess the perceived distance of travel by asking them to indicate when they reached a previously presented target. In a second experiment lateral vection will be evoked by a period of sideways visual acceleration. Following the experience the screen will be blanked. If this acceleration is interpreted as gravity it will evoke a sense of tilt comparable to that found in the Clément et al. study. Perceived tilt will be assessed by aligning a line with the previously viewed floor of the simulated corridor. In a third experiment distance perception will be measured by asking astronauts to compare the size of an object presented at a known simulated distance with a physical reference held in their hands. In all cases data will be compared to ground control data taken before each astronaut's mission. Control data will also be collected from an age-and- gender-matched sample of na\:ive, earth-bound participants tested at approximately the same intervals as the astronauts. The on-orbit will be collected between 2018 and 2021 although ground-based testing has already commenced. VECTION will significantly improve safety wherever movement under microgravity conditions is required.
@incollection{Harris:2018aa,
	abstract = {Physical linear acceleration experienced in micro-g can be misinterpreted as gravity and induce 
a sense of tilt (Cl\'ement et al. 2001. EBR 138: 410). Previous studies have suggested that visual 
acceleration may be more effective at inducing self-motion (vection) in micro-g and 
furthermore that perceived distance may be underestimated in these environments. The 
VECTION project will in the micro-g of the ISS: (1) quantify how much self-motion is evoked by 
visual acceleration; (2) investigate whether visual acceleration can be interpreted as gravity; 
and (3) exploit size-distance invariance hypothesis to assess the perception of distance. 
Forwards vection will be created using constant-acceleration (0.8m/s/s) translation down a 
virtual corridor presented to astronauts using a head-mounted display (HMD). We will assess 
the perceived distance of travel by asking them to indicate when they reached a previously 
presented target. In a second experiment lateral vection will be evoked by a period of sideways 
visual acceleration. Following the experience the screen will be blanked. If this acceleration is 
interpreted as gravity it will evoke a sense of tilt comparable to that found in the Cl\'ement et al. 
study. Perceived tilt will be assessed by aligning a line with the previously viewed floor of the 
simulated corridor. In a third experiment distance perception will be measured by asking 
astronauts to compare the size of an object presented at a known simulated distance with a 
physical reference held in their hands. In all cases data will be compared to ground control data 
taken before each astronaut's mission. Control data will also be collected from an age-and-
gender-matched sample of na\:ive, earth-bound participants tested at approximately the same 
intervals as the astronauts. 
The on-orbit will be collected between 2018 and 2021 although ground-based testing has 
already commenced. VECTION will significantly improve safety wherever movement under 
microgravity conditions is required. },
	author = {Harris, L. R. and Jenkin, M. R. and Allison, R. S. and McManus, M. and Bury, N.},
	booktitle = {CASI Aero 2018, Quebec, Canada May 15-17, 2018},
	date-added = {2018-09-12 14:24:37 +0000},
	date-modified = {2024-03-04 22:15:38 -0500},
	keywords = {Optic flow & Self Motion (also Locomotion & Aviation)},
	pages = {69-70},
	title = {The CSA VECTION project: interpreting visual acceleration in a micro-g environment},
	year = {2018}}
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