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Head roll dependent variability of subjective visual vertical and ocular counterroll.
Exp Brain Res. 2009 Jun; 195(4):621-6.EB

Abstract

We compared the variability of the subjective visual vertical (SVV) and static ocular counterroll (OCR), and hypothesized a correlation between the measurements because of their shared macular input. SVV and OCR were measured simultaneously in various whole-body roll positions [upright, 45 degrees right-ear down (RED), and 75 degrees RED] in six subjects. Gains of OCR were -0.18 (45 degrees RED) and -0.12 (75 degrees RED), whereas gains of compensation for body roll in the SVV task were -1.11 (45 degrees RED) and -0.96 (75 degrees RED). Normalized SVV and OCR variabilities were not significantly different (P > 0.05), i.e., both increased with increasing roll. Moreover, a significant correlation (R(2) = 0.80, slope = 0.29) between SVV and OCR variabilities was found. Whereas the gain of OCR is different from the gain of SVV, trial-to-trial variability of OCR follows the same roll-dependent modulation observed in SVV variability. We propose that the similarities in variability reflect a common otolith input, which, however, is subject to distinct central processing for determining the gain of SVV and OCR.

Authors+Show Affiliations

Department of Neurology, Zurich University Hospital, Zurich, Switzerland. alexander.tarnutzer@access.unizh.chNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

19415246

Citation

Tarnutzer, Alexander A., et al. "Head Roll Dependent Variability of Subjective Visual Vertical and Ocular Counterroll." Experimental Brain Research, vol. 195, no. 4, 2009, pp. 621-6.
Tarnutzer AA, Bockisch CJ, Straumann D. Head roll dependent variability of subjective visual vertical and ocular counterroll. Exp Brain Res. 2009;195(4):621-6.
Tarnutzer, A. A., Bockisch, C. J., & Straumann, D. (2009). Head roll dependent variability of subjective visual vertical and ocular counterroll. Experimental Brain Research, 195(4), 621-6. https://doi.org/10.1007/s00221-009-1823-4
Tarnutzer AA, Bockisch CJ, Straumann D. Head Roll Dependent Variability of Subjective Visual Vertical and Ocular Counterroll. Exp Brain Res. 2009;195(4):621-6. PubMed PMID: 19415246.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Head roll dependent variability of subjective visual vertical and ocular counterroll. AU - Tarnutzer,Alexander A, AU - Bockisch,Christopher J, AU - Straumann,Dominik, Y1 - 2009/05/05/ PY - 2008/12/02/received PY - 2009/04/20/accepted PY - 2009/5/6/entrez PY - 2009/5/6/pubmed PY - 2009/8/15/medline SP - 621 EP - 6 JF - Experimental brain research JO - Exp Brain Res VL - 195 IS - 4 N2 - We compared the variability of the subjective visual vertical (SVV) and static ocular counterroll (OCR), and hypothesized a correlation between the measurements because of their shared macular input. SVV and OCR were measured simultaneously in various whole-body roll positions [upright, 45 degrees right-ear down (RED), and 75 degrees RED] in six subjects. Gains of OCR were -0.18 (45 degrees RED) and -0.12 (75 degrees RED), whereas gains of compensation for body roll in the SVV task were -1.11 (45 degrees RED) and -0.96 (75 degrees RED). Normalized SVV and OCR variabilities were not significantly different (P > 0.05), i.e., both increased with increasing roll. Moreover, a significant correlation (R(2) = 0.80, slope = 0.29) between SVV and OCR variabilities was found. Whereas the gain of OCR is different from the gain of SVV, trial-to-trial variability of OCR follows the same roll-dependent modulation observed in SVV variability. We propose that the similarities in variability reflect a common otolith input, which, however, is subject to distinct central processing for determining the gain of SVV and OCR. SN - 1432-1106 UR - https://www.unboundmedicine.com/medline/citation/19415246/Head_roll_dependent_variability_of_subjective_visual_vertical_and_ocular_counterroll_ L2 - https://dx.doi.org/10.1007/s00221-009-1823-4 DB - PRIME DP - Unbound Medicine ER -