title: Torsional vestibulo-ocular reflex measurements for identifying otolith asymmetries possibly related to space motion sickness susceptibility.
abstract: Recent studies by Diamond and Markham have identified significant correlations between space motion sickness susceptibility and measures of disconjugate torsional eye movements recorded during parabolic flights.  These results support an earlier proposal by von Baumgarten and Thumler which hypothesized that an asymmetry of otolith function between the two ears is the cause of space motion sickness.  It may be possible to devise experiments that can be performed in the 1 g environment on earth that could identify and quantify the presence of asymmetric otolith  function.  This  paper  summarizes the known physiological and anatomical properties of the otolith organs and the properties of the torsional vestibulo-ocular reflex which are relevant to the design of a stimulus to identify otolith asymmetries.  A specific stimulus which takes advantage of these properties is proposed.
authors.affiliation: Good Samaritan Hospital & Medical Center, Clinical Vestibular Laboratory, Portland, OR 97210, USA.
authors.forename: R J
authors.initials: RJ
authors.lastname: Peterka
mesh_terms: D000054:Acceleration; D018480:Astronauts; D004198:Disease Susceptibility; D005133:Eye Movements / Q000502:physiology; D006801:Humans; D015835:Ocular Motility Disorders / Q000209:etiology / Q000503:physiopathology*; D010037:Otolithic Membrane / Q000473:pathology / Q000503:physiopathology*; D011237:Predictive Value of Tests; D012027:Reflex, Vestibulo-Ocular / Q000502:physiology*; D012399:Rotation / Q000009:adverse effects*; D018489:Space Motion Sickness / Q000209:etiology* / Q000503:physiopathology*; D014102:Torsion Abnormality; D014893:Weightlessness / Q000009:adverse effects