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The somatogravic illusion during centrifugation: sex differences

Herpers, Rainer and Harris, Laurence and McManus, Meaghan and Hofhammer, Thomas and Noppe, Alexandra and Frett, Timo and Jenkin, Michael and Scherfgen, David (2019) The somatogravic illusion during centrifugation: sex differences. 39th ISGP Meeting & ESA Life Sciences Meeting, 2018-06-18 - 2018-06-22, Noordwijk, Netherlands. doi: 10.3389/conf.fphys.2018.26.00025.

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Official URL: https://www.frontiersin.org/10.3389/conf.fphys.2018.26.00025/event_abstract


Maintaining orientation in an environment with non-Earth gravity (1 g) is critical for an astronaut's operational performance. Such environments present a number of complexities for balance and motion. For example, when an astronaut tilts due to ascending or descending an inclined plane on the moon, the gravity vector will be tilted correctly, but the magnitude will be different from on earth. If this results in a mis-perceived tilt, then that may lead to postural and perceptual errors, such as mis-perceiving the orientation of oneself or the ground plane and corresponding errors in task judgment. Rotation on a centrifuge offers a unique opportunity to vary the direction of the gravity vector without physical tilt, that is, without co-activation of the semicircular canals during the simulated tilt. The tilt angle simulated is the tilt of the simple vector sum of gravity and the acceleration added by the centrifuge. Perceiving acceleration as tilt is the well-known somatogravic effect [Mach1875, Clark1951]. Sustained linear acceleration together with gravity creates a single gravito-inertial force (GIF). Under normal gravity conditions, sustained linear acceleration in the transverse plane can create an illusion of tilt - the somatogravic illusion - in which the entire GIF is interpreted as corresponding to gravity. However, the magnitude of the effect, i. e. the fraction of the GIF that is interpreted as gravity, has not been well quantified in the sagittal plane. We, therefore, varied the added acceleration to induce a somatogravic illusion and measured the perceptual effects using a haptic rod to indicate the perceived direction of gravity. Previous experiments measuring the somatogravity illusion have used a swinging gondola, hypergravity and a visual assessment method [Tribukait1999, Tribukait2006]. Our experiments used a haptic rod outside of the participant's view, ruling out effects of eye torsion, and a fixed chair mounted so that the participant sat upright and nose-out to provide a controlled and constant direction of otolith stimulation over a physiologically valid range of acceleration forces.

Item URL in elib:https://elib.dlr.de/185734/
Document Type:Conference or Workshop Item (Speech)
Title:The somatogravic illusion during centrifugation: sex differences
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Herpers, RainerHochschule Bonn-Rhein-Sieg, Sankt Augustin, GermanyUNSPECIFIEDUNSPECIFIED
Harris, LaurenceYork University Psychology, Toronto Ontario, CanadaUNSPECIFIEDUNSPECIFIED
McManus, MeaghanCentre for Vision Research, York University, CanadaUNSPECIFIEDUNSPECIFIED
Hofhammer, ThomasHochschule Bonn-Rhein-Sieg, Sankt Augustin, GermanyUNSPECIFIEDUNSPECIFIED
Frett, TimoUNSPECIFIEDhttps://orcid.org/0000-0002-5572-1177UNSPECIFIED
Jenkin, MichaelYork University Computer Science and Engineering, Toronto Ontario, CanadaUNSPECIFIEDUNSPECIFIED
Scherfgen, DavidHochschule Bonn Rhein-Sieg, Sankt Augustin, GermanyUNSPECIFIEDUNSPECIFIED
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Somatogravic Illusion, perception of upright, Centrifugation, vestibular system, gravito-inertial force
Event Title:39th ISGP Meeting & ESA Life Sciences Meeting
Event Location:Noordwijk, Netherlands
Event Type:international Conference
Event Start Date:18 June 2018
Event End Date:22 June 2018
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Research under Space Conditions
DLR - Research area:Raumfahrt
DLR - Program:R FR - Research under Space Conditions
DLR - Research theme (Project):R - Human performance under altered gravity conditions
Location: Köln-Porz
Institutes and Institutions:Institute of Aerospace Medicine > Office of Management and Budget
Institute of Aerospace Medicine > Gravitational Biology
Deposited By: Becker, Christine
Deposited On:11 Apr 2022 10:17
Last Modified:24 Apr 2024 20:47

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