Body Pitch Together With Translational Body Motion Biases the Subjective Haptic Vertical
Body Pitch Together With Translational Body Motion Biases the Subjective Haptic Vertical
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DOI：
10.1163/22134808-bja10086
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发表时间：
2023-01-01
影响因子：
1.6
通讯作者：
Sakurai，Kenzo
中科院分区：
文献类型：
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作者：
Tseng，Chia-Huei;Chow，Hiu Mei;Sakurai，Kenzo
对垂直度的准确感知对于姿势的维持和与世界的成功物理互动至关重要。虽然之前的研究已经考察了身体定向和自我运动在受控良好的实验室条件下的独立影响，但这些因素在现实世界中不断变化和相互作用。在这项研究中，我们考察了真实世界场景中的主观触觉垂直。在这里，我们报告了在香港山顶缆车上进行的一项现场实验中，参与者在6°至26°的坡度上旅行时，垂直知觉的偏差。无论眼睛是睁着(实验1)还是闭着(实验2)，平均主观触觉垂直(SHV)随斜度增加达15°。为了补偿山坡，将身体俯仰移动一个固定的角度并不能减少垂直度偏差(实验3)。这些操作分别排除了视觉和前庭输入的绝对身体俯仰作为我们观察到的偏见的贡献者。在平地上行驶的有轨电车(实验4A)或在静止的牙科椅子上以与山地有轨电车相似的倾斜度(实验4B)收集的观察结果表明，主观垂直与重力没有显著偏差。我们的结论是，SHV误差是由于大的动态身体俯仰和平移运动的组合造成的。这些在真实世界场景中的观察结果激励了神经学家和航空专家研究现场条件下感知的垂直度，并提高了人们对身体俯仰和平移自我运动结合在一起时对垂直度的危险误解的认识。
Accurate perception of verticality is critical for postural maintenance and successful physical interaction with the world. Although previous research has examined the independent influences of body orientation and self-motion under well-controlled laboratory conditions, these factors are constantly changing and interacting in the real world. In this study, we examine the subjective haptic vertical in a real-world scenario. Here, we report a bias of verticality perception in a field experiment on the Hong Kong Peak Tram as participants traveled on a slope ranging from 6° to 26°. Mean subjective haptic vertical (SHV) increased with slope by as much as 15°, regardless of whether the eyes were open (Experiment 1) or closed (Experiment 2). Shifting the body pitch by a fixed degree in an effort to compensate for the mountain slope failed to reduce the verticality bias (Experiment 3). These manipulations separately rule out visual and vestibular inputs about absolute body pitch as contributors to our observed bias. Observations collected on a tram traveling on level ground (Experiment 4A) or in a static dental chair with a range of inclinations similar to those encountered on the mountain tram (Experiment 4B) showed no significant deviation of the subjective vertical from gravity. We conclude that the SHV error is due to a combination of large, dynamic body pitch and translational motion. These observations made in a real-world scenario represent an incentive to neuroscientists and aviation experts alike for studying perceived verticality under field conditions and raising awareness of dangerous misperceptions of verticality when body pitch and translational self-motion come together.