Visuomotor sensitivity to visual information about surface orientation.
Visuomotor sensitivity to visual information about surface orientation.
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DOI：
10.1152/jn.00184.2003
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发表时间：
2004-03
影响因子：
2.5
通讯作者：
D. Knill;D. Kersten
中科院分区：
文献类型：
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作者：
D. Knill;D. Kersten
我们通过分析将物体放置在倾斜表面上的动作来测量人类视觉运动对有关三维表面方向的视觉信息的敏感性。我们将线性判别分析应用于受试者对不同倾斜(与正面平行的角度)表面的运动的运动学分析，以得出用于区分倾斜不同5度的表面的视觉运动因子d。受试者对表面方位信息的视觉运动敏感度非常高，辨别阈值从2到3度不等。在第一个实验中，我们发现受试者单独使用双眼线索时的表现仅略好于单眼纹理线索，并且当两种线索都可用时，他们只显示出结合线索的微弱证据，这表明单眼线索在引导运动行为深度方面可以与双目线索一样有效。在第二个实验中，我们测量了受试者在同等刺激条件下的知觉辨别和视觉运动阈值，以将视觉运动敏感性分解为知觉和运动成分。研究发现，受试者的视觉运动阈值在1到3个S的记忆延迟范围内略高于他们的知觉阈值。该数据符合一个模型，即知觉噪声随着刺激呈现和动作启动之间的延迟增加而增加，但运动噪声保持不变。这一结果表明，视觉运动系统和知觉系统依赖于相同的对表面倾斜的视觉估计，导致记忆延迟，范围从1到3，S。
We measured human visuomotor sensitivity to visual information about three-dimensional surface orientation by analyzing movements made to place an object on a slanted surface. We applied linear discriminant analysis to the kinematics of subjects' movements to surfaces with differing slants (angle away form the fronto-parallel) to derive visuomotor d's for discriminating surfaces differing in slant by 5 degrees. Subjects' visuomotor sensitivity to information about surface orientation was very high, with discrimination "thresholds" ranging from 2 to 3 degrees. In a first experiment, we found that subjects performed only slightly better using binocular cues alone than monocular texture cues and that they showed only weak evidence for combining the cues when both were available, suggesting that monocular cues can be just as effective in guiding motor behavior in depth as binocular cues. In a second experiment, we measured subjects' perceptual discrimination and visuomotor thresholds in equivalent stimulus conditions to decompose visuomotor sensitivity into perceptual and motor components. Subjects' visuomotor thresholds were found to be slightly greater than their perceptual thresholds for a range of memory delays, from 1 to 3 s. The data were consistent with a model in which perceptual noise increases with increasing delay between stimulus presentation and movement initiation, but motor noise remains constant. This result suggests that visuomotor and perceptual systems rely on the same visual estimates of surface slant for memory delays ranging from 1 to 3 s.