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  • Title: Visual effects on the subjective visual vertical and subjective postural head vertical during static roll-tilt.
    Author: Tamura A, Wada Y, Kurita A, Matsunobu T, Inui T, Shiotani A.
    Journal: Laryngoscope Investig Otolaryngol; 2017 Jun; 2(3):125-130. PubMed ID: 28894832.
    Abstract:
    OBJECTIVES: Tilt perception is part of the perception of spatial orientation. It is determined not only by the allocentric gravity axis, but also by a second allocentric axis induced by visual information as well as by the egocentric body (head) axis induced by somatosensory information. The aim of this study was to quantify roll-tilt perception using the subjective visual vertical (SVV) and the newly developed subjective postural head vertical (SPHV) and to investigate the visual effects on both during static roll-tilt. STUDY DESIGN: Basic science. METHODS: Nine male volunteers participated in this study. A flight simulator was used to create several roll-tilt environments that were then combined with visual information. SVV and SPHV were evaluated in healthy participants during static roll-tilt. RESULTS: The SVV evaluation revealed significant differences between the dark condition (control) and other visual conditions with respect to some of the body roll-tilt environments, and between a body roll-tilt of 0° and ≥ 20°. The SPHV evaluation revealed a significant difference between the dark condition and the visual condition that was always roll-tilted 20° to the right of the body axis. However, there were no significant differences in SPHV error between a body roll-tilt of 0° and other tilt angles for every visual condition, unlike SVV error. CONCLUSIONS: Our data indicate that human susceptibility to spatial disorientation is dependent on roll-tilt angle and visual information. They also suggest that the SPHV is not affected by roll-tilt angle, and thus differs from SVV. LEVEL OF EVIDENCE: NA.
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