Gravity dependence of the effect of optokinetic stimulation on the subjective visual vertical
Gravity dependence of the effect of optokinetic stimulation on the subjective visual vertical
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DOI：
10.1152/jn.00303.2016
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发表时间：
2017-05-01
影响因子：
2.5
通讯作者：
Tarnutzer, Alexander Andrea
中科院分区：
文献类型：
--
作者：
Ward, Bryan K.;Bockisch, Christopher J.;Tarnutzer, Alexander Andrea
准确和精确地估计重力方向对于空间定向至关重要。根据贝叶斯理论，多感觉前庭，视觉和本体感觉输入集中集成在一个加权的方式的基础上的组件感觉信号的可靠性。对于耳石输入，随着滚转角的增加，信噪比降低。我们假设前庭（耳石）和前庭外（视觉/本体感受）传感器的重量是滚动角依赖性的，并预测随着滚动角的增加，前庭外线索的重量增加，可能遵循贝叶斯假设。为了探讨这一概念，在不同的滚转位置（= 30度（P < 0.005））的主观视觉垂直（SVV）进行了评估。偏移从3.9 +/- 1.8度（直立）增加到22.1 +/- 11.8度（+/- 120度滚转倾斜，P
Accurate and precise estimates of direction of gravity are essential for spatial orientation. According to Bayesian theory, multisensory vestibular, visual, and proprioceptive input is centrally integrated in a weighted fashion based on the reliability of the component sensory signals. For otolithic input, a decreasing signal-to-noise ratio was demonstrated with increasing roll angle. We hypothesized that the weights of vestibular (otolithic) and extravestibular (visual/proprioceptive) sensors are roll-angle dependent and predicted an increased weight of extravestibular cues with increasing roll angle, potentially following the Bayesian hypothesis. To probe this concept, the subjective visual vertical (SVV) was assessed in different roll positions (= 30 degrees (P < 0.005). Offsets grew from 3.9 +/- 1.8 degrees (upright) to 22.1 +/- 11.8 degrees (+/- 120 degrees roll tilt, P