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
中科院分区:
文献类型:
--
作者:
Dokka K;Kenyon RV;Keshner EA;Kording KP
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.
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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
影响因子:
2.4
作者:
Dokka, Kalpana;Kenyon, Robert V.;Keshner, Emily A.
通讯作者:
Keshner, Emily A.
DOI:
10.1089/cpb.2006.9.163
发表时间:
2006-04-01
期刊:
CYBERPSYCHOLOGY & BEHAVIOR
影响因子:
--
作者:
Keshner, E. A.;Dokka, K.;Kenyon, R. V.
通讯作者:
Kenyon, R. V.
影响因子:
5.5
作者:
FITZPATRICK, R;MCCLOSKEY, DI
通讯作者:
MCCLOSKEY, DI
影响因子:
2.9
作者:
COHEN, H
通讯作者:
COHEN, H