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Variability in Perceived Tilt During a Roll Plane Canal-Otolith Conflict in a Gondola Centrifuge
KTH, Skolan för teknik och hälsa (STH), Naturvetenskap och biomedicin, Omgivningsfysiologi.
KTH, Skolan för teknik och hälsa (STH), Naturvetenskap och biomedicin, Omgivningsfysiologi.
KTH, Skolan för teknik och hälsa (STH), Naturvetenskap och biomedicin, Omgivningsfysiologi.
2013 (engelsk)Inngår i: Aviation, Space and Environmental Medicine, ISSN 0095-6562, E-ISSN 1943-4448, Vol. 84, nr 11, s. 1131-1139Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Background: During a simulated coordinated turn in a gondola centrifuge, the perceived roll-tilt, quantified as the subjective visual horizontal (SVH), may differ tenfold between individuals. One aim of this study was to discern whether this variability reflects real individual characteristics or is due to noise or day-to-day variation. We also wanted to establish whether there are any habituation or learning effects of the centrifuge test. Methods: In nine nonpilots (NP) and nine student pilots (SP), with a flight experience of 150 h, the SVH was measured using an adjustable luminous line in darkness. At two test occasions (T1, T2) (interval 5-14 d) subjects underwent two runs (R1, R2; acceleration to 2 G in 10 s, gondola inclination 60 degrees, 5 min at 2 G, deceleration to 1 g in 10 s, interval between runs 5 min) in a centrifuge (r = 9.1 m). Initial and final SVH was determined for each individual run. Results: Acceleration of the centrifuge induced a tilt of the SVH. At T1R1, this SVH tilt was, in NP, initially 24 +/- 18 degrees and finally 8 +/- 10 degrees. The corresponding values for SP were 28 +/- 18 degrees and 31 +/- 33 degrees. The SVH tilt was slightly larger at R2 than at R1. There was no difference between T1 and T2. Reliability coefficients ranged between 0.86 and 0.98 for NP and between 0.78 and 0.99 for SR. Conclusion: The large interindividual variability combined with a very high reproducibility suggests the existence of persistent individual characteristics in the perception of complex vestibular stimuli. Habituation or learning effects of gondola centrifugation appears to be small.

sted, utgiver, år, opplag, sider
2013. Vol. 84, nr 11, s. 1131-1139
Emneord [en]
spatial disorientation, vestibular stimuli, habituation, centrifuge
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-136135ISI: 000332996700002PubMedID: 24279225Scopus ID: 2-s2.0-84887323677OAI: oai:DiVA.org:kth-136135DiVA, id: diva2:670966
Merknad

QC 20140424

Tilgjengelig fra: 2013-12-03 Laget: 2013-12-03 Sist oppdatert: 2018-01-11bibliografisk kontrollert

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