The awareness of body orientation modulates the perception of visual vertical
The awareness of body orientation modulates the perception of visual vertical
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DOI：
10.1016/j.neuropsychologia.2012.06.021
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发表时间：
2012-08-01
期刊：
影响因子：
2.6
通讯作者：
Bronstein, Adolfo M.
中科院分区：
文献类型：
--
作者：
Barra, Julien;Perennou, Dominic;Bronstein, Adolfo M.
身体位置对垂直感的影响是确定的。相比之下，身体方向意识对垂直感的可能影响从未被研究过。顶叶皮层和脑岛在身体位置感知和垂直度感知中所起的作用支持了本研究所探索的这一假设。九名受试者被要求在三种条件下通过12次调整发光线来估计视觉垂直（VV）的方向：(1)控制条件（受试者直立并意识到自己的位置），(2)侧倾与倾斜意识一致的条件，(3)主客观方向分离的条件（倾斜的受试者感觉直立）。在一个机动飞行模拟器中，通过实验诱导体位垂直（PV）偏差，在黑暗中30度侧体倾斜5分钟（平均8.8 +/- 4度，最小6.2度，最大17.4度），实现了客观和主观取向的分离。测量VV方向和变异性（按以下顺序表示）。与直立状态（0.3度+/- 0.2度；0.8度+/- 0.5度）相比，受试者表现出相似的VV方向（0.1度+/- 0.6度，p=0.82），但变异性增加（1.4度+/- 0.5度，p=0.82）
It is established that the body position influences verticality perception. In contrast, the possible influence of the awareness of the body orientation on verticality perception has never been investigated. This hypothesis, explored in the present study, is supported by the role played by the parietal cortex and the insula in both body position awareness and verticality perception.Nine subjects were asked to estimate the direction of the visual vertical (VV) by 12 adjustments of a luminous line in three conditions: (1) a control condition (subjects were upright and aware of their position), (2) a condition of congruence between the lateral body tilt and the awareness of this tilt, and (3) a condition of dissociation of subjective and objective orientations (tilted subjects who felt upright). The dissociation between objective and subjective orientations was obtained by inducing experimentally a postural vertical (PV) bias through 5 min of lateral body tilt at 30 degrees in darkness in a motorized flight simulator (mean 8.8 +/- 4; min 6.2 degrees; max 17.4 degrees). VV orientation and variability were measured (expressed below in this order).As compared to the upright condition (0.3 degrees +/- 0.2; 0.8 degrees +/- 0.5), subjects showed similar VV orientation (0.1 degrees +/- 0.6; p=0.82) but an increased variability (1.4 degrees +/- 0.5; p