Perceiving a stable world during active rotational and translational head movements
Perceiving a stable world during active rotational and translational head movements
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DOI：
10.1007/s00221-004-2191-8
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发表时间：
2005-06-01
影响因子：
2
通讯作者：
Harris, LR
中科院分区：
文献类型：
--
作者：
Jaekl, PM;Jenkin, MR;Harris, LR
当一个人在世界中移动时，环境在相反方向上的相关视觉位移通常不被视为外部运动，而是对稳定世界的不断变化的看法。我们测量了在活动的、正弦的、平移的和旋转的头部运动中，可以容忍的视觉运动量与在稳定世界中运动的感觉相容。通过低延迟的机械头部跟踪器监测头部运动，并将信息用于更新头盔上的视觉显示器。在头部跟踪器和显示器之间引入了可变增益。10名受试者调整这一增益，直到在0.5赫兹的正弦偏航、俯仰和侧滚头部旋转以及鼻枕、耳间和背腹平移时视觉显示看起来稳定。每一次头部运动都被测试为垂直于重力或平行于重力的运动。广泛的涨幅被认为是稳定的(旋转0.8%到1.4%，平移1.1%到1.8%)。最有可能被认为是稳定的增益大于几何体所需的增益(旋转1.2；平移1.4)。对于旋转运动，所有轴的平均增益是相同的。平移运动不受耳间运动(平均增益1.6)或腹背向运动(平均增益1.5)的影响，也不受平移方向相对于重力方向的影响。然而，与其他方向相比，鼻枕方向的平移与更紧密的垂直设置(平均增益1.1)和更窄的标准偏差相关。这些发现是从视觉和非视觉的贡献来讨论的，这些视觉和非视觉的贡献在活跃的头部运动中对地球稳定环境的感知。
When a person moves through the world, the associated visual displacement of the environment in the opposite direction is not usually seen as external movement but rather as a changing view of a stable world. We measured the amount of visual motion that can be tolerated as compatible with the perception of moving within a stable world during active, sinusoidal, translational and rotational head movement. Head movements were monitored by means of a low-latency, mechanical head tracker and the information was used to update a helmet-mounted visual display. A variable gain was introduced between the head tracker and the display. Ten subjects adjusted this gain until the visual display appeared stable during sinusoidal yaw, pitch and roll head rotations and naso-occipital, inter-aural and dorso-ventral translations at 0.5 Hz. Each head movement was tested with movement either orthogonal to or parallel with gravity. A wide spread of gains was accepted as stable (0.8 to 1.4 for rotation and 1.1 to 1.8 for translation). The gain most likely to be perceived as stable was greater than that required by the geometry (1.2 for rotation; 1.4 for translation). For rotational motion, the mean gains were the same for all axes. For translation there was no effect of whether the movement was inter-aural (mean gain 1.6) or dorso-ventral (mean gain 1.5) and no effect of the relative orientation of the translation direction relative to gravity. However translation in the naso-occipital direction was associated with more closely veridical settings (mean gain 1.1) and narrower standard deviations than in other directions. These findings are discussed in terms of visual and non-visual contributions to the perception of an earth-stable environment during active head movement.