Testing the limits of optimal integration of visual and proprioceptive information of path trajectory
Testing the limits of optimal integration of visual and proprioceptive information of path trajectory
复制标题
测试路径轨迹的视觉和本体感觉信息最优整合的极限
DOI：
10.1007/s00221-011-2596-0
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发表时间：
2011
影响因子：
2
通讯作者：
Fiehler
中科院分区：
文献类型：
--
作者：
Reuschel;Rösler;Henriques;Fiehler
许多研究证明，根据最大似然估计模型（MLE）整合了来自不同模态的信息。例如，我们最近发现视觉和本体感觉路径轨迹是最佳组合（Reuschel et al. in Exp Brain Res 201:853-862, 2010）。然而，其他研究未能揭示这种动态信息的最佳整合。在目前的研究中，我们的目标是将我们之前的发现推广到工作空间的不同部分（中央、同侧或对侧）和不同类型的判断（相对与绝对）。参与者通过判断一条角度路径是锐角还是钝角来做出相对判断，或者通过判断一条分段的直线路径是向左还是向右来做出绝对判断。轨迹以视觉、本体感受或视觉-本体感受相结合的方式呈现。我们测量了这些估计的偏差和方差，并使用MLE预测了这两个参数。根据MLE模型，参与者根据其可靠度对单峰角路径信息进行线性组合和加权，而不考虑工作空间的侧面。然而，双峰估计的精度并不高于单峰估计，这与MLE不一致。对于绝对判断任务，参与者的估计是高度准确的，并且在不同的模式下没有差异。因此，我们无法测试双峰感知是否是视觉和本体感觉输入的加权平均值。此外，与单峰条件相比，参与者在双峰条件下并不更加精确，这与MLE不一致。目前的研究结果表明，路径轨迹的视觉和本体感觉信息的最佳整合仅适用于某些条件。
Many studies provide evidence that information from different modalities is integrated following the maximum likelihood estimation model (MLE). For instance, we recently found that visual and proprioceptive path trajectories are optimally combined (Reuschel et al. in Exp Brain Res 201:853–862, 2010). However, other studies have failed to reveal optimal integration of such dynamic information. In the present study, we aim to generalize our previous findings to different parts of the workspace (central, ipsilateral, or contralateral) and to different types of judgments (relative vs. absolute). Participants made relative judgments by judging whether an angular path was acute or obtuse, or they made absolute judgments by judging whether a one-segmented straight path was directed to left or right. Trajectories were presented in the visual, proprioceptive, or combined visual–proprioceptive modality. We measured the bias and the variance of these estimates and predicted both parameters using the MLE. In accordance with the MLE model, participants linearly combined and weighted the unimodal angular path information by their reliabilities irrespective of the side of workspace. However, the precision of bimodal estimates was not greater than that for unimodal estimates, which is inconsistent with the MLE. For the absolute judgment task, participants’ estimates were highly accurate and did not differ across modalities. Thus, we were unable to test whether the bimodal percept resulted as a weighted average of the visual and proprioceptive input. Additionally, participants were not more precise in the bimodal compared with the unimodal conditions, which is inconsistent with the MLE. Current findings suggest that optimal integration of visual and proprioceptive information of path trajectory only applies in some conditions.
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影响因子：
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作者：
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作者：
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影响因子：
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DOI：
10.2307/1420246
发表时间：
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期刊：
The American journal of psychology
影响因子：
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作者：
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通讯作者：
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