Influence of dynamic tilts on the perception of earth-vertical
Influence of dynamic tilts on the perception of earth-vertical
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DOI：
10.1007/s00221-002-1343-y
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发表时间：
2003-04-01
影响因子：
2
通讯作者：
Hess, BJM
中科院分区：
文献类型：
--
作者：
Jaggi-Schwarz, K;Hess, BJM
本研究的目的是测试的假设，最佳激活的半规管和耳石提供可靠的前庭线索的自我定位空间。为此，我们测量了受试者在从直立快速倾斜（180度/s（2））到90度左右下的不同侧倾位置后20 s和90 s立即估计主观垂直的能力。受试者必须通过（a）设置一条发光线，（B）进行扫视，（c）口头宣布身体相对于重力的位置来估计黑暗中地球垂直和地球水平的方向。三种范式的平均误差曲线显示一致的E（Muller）和A（Aubert）效应，随时间推移没有显著变化。水平和垂直眼跳任务表现出不同的反应特征，如以前所报道的其他人，这可能反映了不同的计算机制。言语估计范式产生了互补的结果，发光线范式和垂直眼跳任务。发光线和垂直扫视范式的E效应可能是由于前庭和颈部传入信号的相互作用而导致的对地球垂直的偏差。发光线和垂直扫视范式的恒定小A效应可能反映了在我们的实验中影响相对较弱的体感信号。我们的结论是，相位激活的前庭系统减少了非前庭线索的影响，在低倾斜速度或静态实验中观察到。虽然这种激活会产生E效应，但在90度范围内的总误差会减少。
The aim of this study was to test the hypothesis that optimal activation of both the semicircular canals and the otoliths provides reliable vestibular cues about self-orientation in space. For this, we measured the ability of subjects to estimate the subjective vertical immediately, 20 s and 90 s after a rapid tilt (180degrees/s(2)) from upright into different roll positions between 90degrees left and right side down. Subjects had to estimate the earth-vertical and earth-horizontal direction in the dark by (a) setting a luminous line, (b) performing saccades, and (c) verbally declaring body position relative to gravity. The mean error curves from the three paradigms showed consistent E (Muller)- and A (Aubert)-effects, which did not significantly change over time. Horizontal and vertical saccade tasks exhibited different response characteristics, as previously reported by others, which likely reflect different computation mechanisms. The verbal estimation paradigm yielded complementary results to those of the luminous line paradigm and vertical saccade task. The E-effect of the luminous line and the vertical saccade paradigm might be explained by a bias towards earth-vertical due to interactions of vestibular and neck afferent signals. The invariably small A-effect of the luminous line and the vertical saccade paradigm probably reflects somatosensory signals that had relatively weak influence in our experiments. We conclude that phasic activation of the vestibular system reduces the influence of non-vestibular cues observed in low tilt velocity or static experiments. Although this activation generates an E-effect, the total error in the range of 90degrees is reduced.