The combination of vision and touch depends on spatial proximity
The combination of vision and touch depends on spatial proximity
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DOI：
10.1167/5.11.7
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发表时间：
2005-01-01
影响因子：
1.8
通讯作者：
Banks, MS
中科院分区：
文献类型：
--
作者：
Gepshtein, S;Burge, J;Banks, MS
神经系统通常将关于对象属性的视觉和触觉信息组合，使得组合的估计比单独的视觉或触觉更精确。我们研究了系统如何确定何时组合联合收割机信号。据推测，来自不同物体的信号不应合并。信号来自不同物体的可能性与信号之间的空间分离高度相关，因此我们询问视觉和触觉信号之间的空间分离如何影响它们的组合。要做到这一点，我们首先为每个观察员创造条件，其中组合的效果-增加歧视精度与两种方式相对于性能与一种方式-应该是最大的。然后，在这些条件下，我们提出了视觉和触觉刺激分开不同的空间距离，并比较人类的表现与预测的模型，结合信号最佳。我们发现，当信号来自同一位置时，辨别精度基本上是最佳的，而当信号来自不同位置时，辨别精度较差。因此，视觉-触觉组合的机制专门用于在空间中重合的信号。
The nervous system often combines visual and haptic information about object properties such that the combined estimate is more precise than with vision or haptics alone. We examined how the system determines when to combine the signals. Presumably, signals should not be combined when they come from different objects. The likelihood that signals come from different objects is highly correlated with the spatial separation between the signals, so we asked how the spatial separation between visual and haptic signals affects their combination. To do this, we first created conditions for each observer in which the effect of combination-the increase in discrimination precision with two modalities relative to performance with one modality-should be maximal. Then under these conditions, we presented visual and haptic stimuli separated by different spatial distances and compared human performance with predictions of a model that combined signals optimally. We found that discrimination precision was essentially optimal when the signals came from the same location, and that discrimination precision was poorer when the signals came from different locations. Thus, the mechanism of visual-haptic combination is specialized for signals that coincide in space.