The uncertainty associated with visual flow fields and their influence on postural sway: Weber's law suffices to explain the nonlinearity of vection.
The uncertainty associated with visual flow fields and their influence on postural sway: Weber's law suffices to explain the nonlinearity of vection.
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DOI：
10.1167/10.14.4
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发表时间：
2010-12-03
影响因子：
1.8
通讯作者：
Körding KP
中科院分区：
文献类型：
--
作者：
Wei K;Stevenson IH;Körding KP
当我们直立站立时，我们会整合来自视觉和本体感觉等多种感官的线索，以维持和调节我们的垂直姿势。这些线索如何组合一直是一系列研究的焦点。这些研究通常测量受试者在面对虚拟环境中显示的移动视觉刺激时如何偏离直立。先前的研究表明，不确定性是这类线索组合问题的核心。在这里，我们想要定量地理解，视觉流场和它们的不确定性是如何影响人类姿势的。为此，我们将知觉心理物理学的实验方法与运动控制研究的方法结合起来。我们使用两种选择的强迫选择范式来测量不确定性，作为随机点流场和刺激相干性大小的函数。我们随后测量了运动振幅作为视觉刺激参数的函数。根据以往的研究，我们发现感觉运动行为与刺激幅度呈非线性关系，重要的是，受不确定性的影响。我们发现这种非线性和不确定性依赖可以被标准贝叶斯线索组合准确地预测。重要的是，韦伯定律认为视觉不确定性取决于刺激幅度，这足以解释非线性行为。
When we stand upright, we integrate cues from multiple senses, such as vision and proprioception, to maintain and regulate our vertical posture. How these cues are combined has been the focus of a range of studies. These studies generally measured how subjects deviate from standing upright when confronted with a moving visual stimulus displayed in a virtual environment. Previous research had shown that uncertainty is central in such cue combination problems. Here we wanted to understand, quantitatively, how visual flow fields and uncertainty about them affect human posture. To do so, we combined experimental methods from perceptual psychophysics with methods from motor control studies. We used a two-alternative forced-choice paradigm to measure uncertainty as a function of the magnitude of a random-dot flow field and stimulus coherence. We subsequently measured movement amplitude as a function of visual stimulus parameters. In line with previous research, we find that sensorimotor behavior depends nonlinearly on the stimulus amplitude and, importantly, is affected by uncertainty. We find that this nonlinearity and uncertainty dependence is accurately predicted by standard Bayesian cue combination. Importantly, a Weber’s law where visual uncertainty depends on stimulus amplitude is enough to explain the nonlinear behavior.
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影响因子：
2.4
作者：
Dokka, Kalpana;Kenyon, Robert V.;Keshner, Emily A.
通讯作者：
Keshner, Emily A.
影响因子：
64.8
作者：
Körding, KP;Wolpert, DM
通讯作者：
Wolpert, DM
影响因子：
1.8
作者：
Burr, DC;Santoro, L
通讯作者：
Santoro, L
影响因子：
9.2
作者：
Alais, D;Burr, D
通讯作者：
Burr, D
DOI：
10.1016/s0926-6410(96)00044-4
发表时间：
1996-12-01
期刊：
COGNITIVE BRAIN RESEARCH
影响因子：
--
作者：
Ohmi, M
通讯作者：
Ohmi, M