Visuospatial orientation: Differential effects of head and body positions.

Visuospatial orientation: Differential effects of head and body positions.
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DOI:
10.1016/j.neulet.2022.136548
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发表时间:
2022-04-01
影响因子:
2.5
通讯作者:
Kheradmand A
Kheradmand A
中科院分区:
医学4区
文献类型:
--
作者:
Castro P;Hussain S;Mohamed OG;Kaski D;Arshad Q;Bronstein AM;Kheradmand A

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为了在空间中定位,大脑必须整合对身体位置进行编码的感觉信息和来自周围环境的视觉线索。在这个过程中,对视觉信息的依赖程度被称为视觉依赖。在这里,我们问是否头和身体的相对位置可以调节这种视觉依赖(VD)。我们使用视动刺激(30 °/s)对主观视觉垂直(SVV)的影响来量化VD,作为顺时针和逆时针方向上视动诱导的SVV偏差的平均值。在8名受试者中测量了VD偏倚,这些受试者具有头对身体倾斜(HBT),其中仅头部倾斜在身体上,以及具有全身倾斜(WBT),其中头部和身体一起倾斜。HBT为20°时的VD偏倚与头倾斜位置的方向相同(左侧倾斜VD −1.35±.1.2°;右侧倾斜VD 1.60±0.9°),而WBT为20°时的VD偏倚与身体倾斜位置的方向不同(左侧倾斜VD 2.5±1.1°;右侧倾斜VD −2.1±0.9°)。这些研究结果表明,相对头部和身体位置的视觉线索整合,这一过程,可以促进与周围环境的空间方向的最佳互动的差异。
To orientate in space, the brain must integrate sensory information that encodes the position of the body with the visual cues from the surrounding environment. In this process, the extent of reliance on visual information is known as the visual dependence. Here, we asked whether the relative positions of the head and body can modulate such visual dependence (VD). We used the effect of optokinetic stimulation (30 °/s) on subjective visual vertical (SVV) to quantify VD as the average optokinetic-induced SVV bias in clockwise and counter-clockwise directions. The VD bias was measured in eight subjects with a head-on-body tilt (HBT) where only the head was tilted on the body, and also with a whole-body tilt (WBT) where the head and body were tilted together. The VD bias with HBT of 20° was in the same direction of the head tilt position (left tilt VD −1.35±.1.2°; right VD 1.60±0.9°), whereas the VD bias with WBT of 20° was in a direction away from the body tilt position (left tilt VD 2.5±1.1°; right tilt VD −2.1±0.9°). These findings show differential effects of relative head and body positions on visual cue integration, a process which could facilitate optimal interaction with the surrounding environment for spatial orientation.
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