Sensorimotor aspects of high-speed artificial gravity - I. Sensory conflict in vestibular adaptation

Sep 5, 2026

Short-radius centrifugation is evaluated as a countermeasure against the negative effects of prolonged weightlessness. Fast rotation and head motion generate Coriolis effects that disrupt sensory and motor processing, but intermittent exposure to high rotation rates enables adaptation while preserving perceptual-motor coordination in stationary settings. The study tests how inter-sensory conflict differentially affects vertical nystagmus, illusory body tilt, and motion sickness, highlighting distinct adaptation requirements across measures.

LanguageEnglish

CategoryResearch & Report

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Pages12

Reading Time30 min

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Introduction

Adaptation at higher speeds

Journal of Vestibular Research 12 (2002/2003) 271–282 271 IOS Press Sensorimotor aspects of high-speed artiﬁcial gravity: I. Sensory conﬂict in vestibular adaptation Erika L. Browna , Heiko Hechta,b∗ and Laurence R. Young a aMan-Vehicle Lab, Massachusetts Institute of Technology, Cambridge, MA, USA b Universitt Mainz, Mainz, Germany Received 6 June 2002 Accepted 14 April 2003 Abstract. Short-radius centrifugation offers a promising and affordable countermeasure to the adverse effects of prolonged weightlessness. However, head movements made in a fast rotating environment elicit Coriolis effects, which seriously compromise sensory and motor processes. We found that participants can adapt to these Coriolis effects when exposed intermittently to high rotation rates and, at the same time, can maintain their perceptual-motor coordination in stationary environments. In this paper, we explore the role of inter-sensory conﬂict in this adaptation process. Different measures (vertical nystagmus, illusory body tilt, motion sickness) react differently to visual-vestibular conﬂict and adapt differently. In particular, proprioceptive-vestibular conﬂict sufﬁced to adapt subjective parameters and the time constant of nystagmus decay, while retinal slip was required for VOR gain adaptation. A simple correlation between the strength of intersensory conﬂict and the efﬁcacy of adaptation fails to explain the data. Implications of these ﬁndings, which differ from existing data for low rotation rates, are discussed. Keywords: Coriolis effects, artiﬁcial gravity, orientation illusions, motion sickness, classical conditioning, control theory, sensory conﬂict, space sickness, vestibulo-ocular reﬂex 1. Introduction Sensorimotor functioning in rapidly rotating environments poses numerous challenges to our understanding of sensory psychophysics as well as motor learning. The three papers that follow examine the sensory and motor consequences that arise when humans have to operate in the unfamiliar environment of highspeed rotation. We consider artiﬁcial gravity (AG) by means of high-speed rotation to be the most promising method for preventing serious deconditioning effects associated with prolonged exposure to weightlessness. We deﬁne high-speed rotation as those rotation rates ∗ Corresponding author: Heiko Hecht, MIT Man-Vehicle Lab, 77 Mass Ave., Bldg. 37-219, Cambridge, MA 02139, USA. Tel.: +1 617 253 0017; Fax: +1 617 258 8111; E-mail: [hecht@mit.edu](hecht@mit.edu). necessary to administer AG equivalent to 1-g within the conﬁnes of a small spacecraft (rotation radius not exceeding 3 m) . This amounts to angular velocities in the neighborhood of 20 rpm, or 100 ◦/sec or more. Such a system may in fact be feasible. Not only can humans tolerate the cardiovascular effects of high-speed AG [2, 3,14], they can also adapt their basic motor actions up to at least 20 rpm (DiZio & Lackner, in this volume), and they can adapt to the provocative effects caused by head movements made in the rotating environment [37] . The central issue in the current three papers further explores adaptive changes caused by the unexpected Coriolis forces on the arm, head, and vestibular system associated with movement in a rotating environment. The present paper, Part I ofour investigation, is concerned with the role of sensory conﬂict in vestibular adaptation. Economic factors suggest that AG may be ISSN 0957-4271/02/03/$8 .00 􀀁 2002/2003 – IOS Press. All rights reserved 272 E.L. Brown et al. / High-speed AG: I. Sensory conﬂict best implemented as short-radius intermittent centrifugation at high rotation rates for limited daily exposures. This would require frequent state transitions between 1-g on the ground, 0-g during ﬂight, 0.38-or 1-ag when on the centrifuge during ﬂight, and non-rotational 0.38-g on the surface of Mars. Ideally, such transitions need to be made rapidly and without any after-effects. We know this is possible in principle [38], bu

FAQs

What problem does short-radius centrifugation aim to address?

It targets the adverse effects of prolonged weightlessness by providing artificial gravity through high-speed rotation.

How do participants adapt to Coriolis effects in high-speed artificial gravity environments?

They can adapt when intermittently exposed to high rotation rates, while maintaining perceptual-motor coordination when returning to stationary environments.

Do different measures adapt in the same way?

No. Vertical nystagmus, illusory body tilt, and motion sickness respond differently to visual-vestibular conflict and can require different sensory inputs for adaptation.

Sep 5, 2026

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