Abstract:
:To test a hypothesis about how otoliths resolve roll-tilts from translations, we measured human ocular torsion position [ocular counterrolling (OCR)] to maintained linear acceleration stimuli. All subjects (n = 8) were tested in two conditions where the same magnitude of shear along an interaural axis was generated in one of two ways: either by roll-tilt on a tilt-chair in a 1-g environment, or by centripetal linear acceleration during constant velocity rotation 1 m from the axis of rotation on a fixed-chair human centrifuge. The interaural shear to the otoliths was the same for these two conditions, but the dorsoventral shear was different and for all eight subjects the OCR on the centrifuge was significantly greater than the torsion on the tilt-chair, although the resultant angle was in fact smaller on the centrifuge than on the tilt-chair. The results confirm that dorsoventral shear is important for determining OCR. The otoliths may resolve potential stimulus ambiguities between tilts and translations by virtue of the different patterns of interaural and dorsoventral shear that these stimuli generate.
journal_name
Ann N Y Acad Scijournal_title
Annals of the New York Academy of Sciencesauthors
MacDougall HG,Curthoys IS,Betts GA,Burgess AM,Halmagyi GMdoi
10.1111/j.1749-6632.1999.tb09183.xsubject
Has Abstractpub_date
1999-05-28 00:00:00pages
173-80eissn
0077-8923issn
1749-6632journal_volume
871pub_type
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