Self versus environment motion in postural control.

Self versus environment motion in postural control.
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DOI:
10.1371/journal.pcbi.1000680
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发表时间:
2010-02-19
影响因子:
4.3
通讯作者:
Kording KP
Kording KP
中科院分区:
生物学2区
文献类型:
--
作者:
Dokka K;Kenyon RV;Keshner EA;Kording KP

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为了稳定我们在空间中的位置,我们使用视觉信息以及非视觉物理运动线索。然而,视觉提示可能是模糊的:视觉感知的运动可能是由自我运动、环境运动或两者引起的。神经系统必须将模糊的视觉线索与嘈杂的身体运动线索结合起来,以解决这种模糊性并控制我们的身体姿势。在这里,我们开发了一个贝叶斯模型,形式化了神经系统如何解决这个问题。在这个模型中,神经系统结合感觉线索来估计身体的运动。我们分析表明,只要视觉刺激是快速的,在我们的身体运动的感知的不确定性相比,最佳策略是加权视觉感知的运动速度成正比的幂律。我们发现,这个模型占实验诱导的视觉运动对人类姿势行为的非线性影响,在我们的数据和以前发表的结果。视觉线索通常提供关于我们身体在空间中的方向的模糊信息。当我们感知到自己和环境之间的相对运动时,它可能是由我们在环境中的运动引起的,或者是我们周围环境的运动,或者是我们的身体和环境同时运动。神经系统必须解决这种模糊性,以便在站立时有效地控制我们的身体姿势。在这里,我们表明,神经系统可以解决这个问题,通过最佳结合视觉信号与物理运动线索。感觉歧义是线索组合中的一个核心问题。因此,我们的研究结果有影响的神经系统如何解决其他线索组合任务中的感觉模糊。
To stabilize our position in space we use visual information as well as non-visual physical motion cues. However, visual cues can be ambiguous: visually perceived motion may be caused by self-movement, movement of the environment, or both. The nervous system must combine the ambiguous visual cues with noisy physical motion cues to resolve this ambiguity and control our body posture. Here we have developed a Bayesian model that formalizes how the nervous system could solve this problem. In this model, the nervous system combines the sensory cues to estimate the movement of the body. We analytically demonstrate that, as long as visual stimulation is fast in comparison to the uncertainty in our perception of body movement, the optimal strategy is to weight visually perceived movement velocities proportional to a power law. We find that this model accounts for the nonlinear influence of experimentally induced visual motion on human postural behavior both in our data and in previously published results. Visual cues typically provide ambiguous information about the orientation of our body in space. When we perceive relative motion between ourselves and the environment, it could have been caused by our movement within the environment, or the movement of the environment around us, or the simultaneous movements of both our body and the environment. The nervous system must resolve this ambiguity for efficient control of our body posture during stance. Here, we show that the nervous system could solve this problem by optimally combining visual signals with physical motion cues. Sensory ambiguity is a central problem during cue combination. Our results thus have implications on how the nervous system could resolve sensory ambiguity in other cue combination tasks.
DOI: 10.1523/jneurosci.1607-09.2009
发表时间: 2009-07-15
期刊: The Journal of neuroscience : the official journal of the Society for Neuroscience
影响因子: --
作者:
Liu S;Angelaki DE
通讯作者: Angelaki DE
DOI: 10.1016/j.gaitpost.2009.05.001
发表时间: 2009-08
期刊: GAIT & POSTURE
影响因子: 2.4
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通讯作者: Keshner, Emily A.
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发表时间: 2006-04-01
期刊: CYBERPSYCHOLOGY & BEHAVIOR
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DOI: 10.1113/jphysiol.1994.sp020240
发表时间: 1994-07-01
影响因子: 5.5
作者:
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通讯作者: MCCLOSKEY, DI
DOI: 10.5014/ajot.48.10.919
发表时间: 1994-10-01
影响因子: 2.9
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通讯作者: COHEN, H