On the role of otoliths and semicircular canals in spatial orientation: Dynamics of the visually perceived eye level during gondola centrifugation.
2005 (English)In: Perception & Psychophysics
, ISSN 0031-5117, E-ISSN 1532-5962, Vol. 67, no 7, 1242-1251 p.Article in journal (Refereed) Published
The visually perceived eye level (VPEL) was measured during gondola centrifugation. Subjects (N = 11) were seated upright, facing motion in a swing-out gondola The head was adjusted so that Reid's baseline was tilted 10 degrees anterior end up. The subjects were requested to adjust the position of a small luminous dot so that it was perceived as gravitationally at eye level. In the 1-g environment, the VPEL was a few degrees below the true gravitational eye level (M = -1.75 degrees, SD = 1.90 degrees). After rapid acceleration of the centrifuge to 2 G (vectorial sum of the earth gravity force and the centrifugal force), there was an exponentially increasing depression of the VPEL. The initial value was -6.4 degrees +/- 5.2 degrees. During 10 min at 2 G, the VPEL approached an asymptotic value of -24.8 degrees +/- 5.4 degrees. The time constant showed a large interindividual variability, ranging from 59 to 1,000 sec (M = 261 sec, median = 147 sec). The findings are discussed, taking into consideration otolith-semicircular-canal interaction, as well as memory functions of the vestibular system.
Place, publisher, year, edition, pages
2005. Vol. 67, no 7, 1242-1251 p.
IdentifiersURN: urn:nbn:se:kth:diva-44591DOI: 10.3758/BF03193556ISI: 000235282300012PubMedID: 16502845OAI: oai:DiVA.org:kth-44591DiVA: diva2:451439
QC 201111112011-10-252011-10-252011-11-11Bibliographically approved