A Bayesian model of the disambiguation of gravitoinertial force by visual cues
A Bayesian model of the disambiguation of gravitoinertial force by visual cues
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DOI：
10.1007/s00221-006-0792-0
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发表时间：
2007-05-01
影响因子：
2
通讯作者：
Buelthoff, Heinrich H.
中科院分区：
文献类型：
--
作者：
MacNeilage, Paul R.;Banks, Martin S.;Buelthoff, Heinrich H.
耳石受到重力和惯性力的刺激，因此耳石信号是自我定位的模糊指标。可以通过增加指示相对于地球的方位和加速度的视觉信息来解决模糊性。在这里，我们提出了一个贝叶斯模型的噪声前庭和视觉信号的统计最佳组合。与感觉测量相关联的可能性在取向/加速度空间中表示。与耳石信号相关的似然函数说明了模糊性;对于自定位或加速度没有唯一的解决方案。与其他感觉信号相关的类似功能可以解决这种模糊性。此外，我们提出了两个先验，每个作用于方向/加速度空间中的一个维度上：各向同性先验和无加速度先验。我们使用运动平台和附加的视觉显示器进行了实验，以检查视觉信号对耳石信号解释的影响。当前庭和视觉信号被独立处理时，受试者做出音高和加速度的判断。模型的预测得到证实：（1）视觉信号影响耳石信号的解释，（2）变量较少的信号比变量较多的信号对感知方向和加速度的影响更大，（3）组合估计比单一线索估计更精确。我们还表明，该模型可以解释一些著名的现象，包括感知直立在零重力，奥伯特效应，和somatogravic错觉。
The otoliths are stimulated in the same fashion by gravitational and inertial forces, so otolith signals are ambiguous indicators of self-orientation. The ambiguity can be resolved with added visual information indicating orientation and acceleration with respect to the earth. Here we present a Bayesian model of the statistically optimal combination of noisy vestibular and visual signals. Likelihoods associated with sensory measurements are represented in an orientation/acceleration space. The likelihood function associated with the otolith signal illustrates the ambiguity; there is no unique solution for self-orientation or acceleration. Likelihood functions associated with other sensory signals can resolve this ambiguity. In addition, we propose two priors, each acting on a dimension in the orientation/acceleration space: the idiotropic prior and the no-acceleration prior. We conducted experiments using a motion platform and attached visual display to examine the influence of visual signals on the interpretation of the otolith signal. Subjects made pitch and acceleration judgments as the vestibular and visual signals were manipulated independently. Predictions of the model were confirmed: (1) visual signals affected the interpretation of the otolith signal, (2) less variable signals had more influence on perceived orientation and acceleration than more variable ones, and (3) combined estimates were more precise than single-cue estimates. We also show that the model can explain some well-known phenomena including the perception of upright in zero gravity, the Aubert effect, and the somatogravic illusion.