Pooling signals from vertically and non-vertically orientation-tuned disparity mechanisms in human stereopsis.
Pooling signals from vertically and non-vertically orientation-tuned disparity mechanisms in human stereopsis.
复制标题
汇集来自人类立体视觉中垂直和非垂直方向调整视差机制的信号。
DOI：
10.1016/j.visres.2005.07.011
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
Sampat,Preetha
中科院分区：
文献类型：
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作者：
Patel,SaumilS;Bedell,HaroldE;Sampat,Preetha
要了解的作用，方向调整的视差敏感机制在立体深度的感知中发挥的作用，我们测量立体阈值使用两组随机点刺激，产生相同的刺激的视差机制调整到垂直方向，但不同的刺激的视差机制调整到非垂直方向。使用双轴配置，在呈现给双眼的随机点图像中模拟1或1.5D的屈光模糊。在平行轴条件下，两眼的模拟屈光模糊轴相同（0、45或135 °）。在正交轴条件下，双眼的屈光模糊轴正交（LE：180，RE：90; LE：90，RE：180; LE：45，RE：135;和LE：135，RE：45）。然而，调整到接近垂直方向的视差机制的刺激在倾斜的平行轴和正交轴条件下应该是相似的，非垂直调整的视差机制的刺激应该是不同的。测得的立体thresholds是较高的正交相比，平行轴的条件下，由约2和5的因素，1和1.5D的模拟斜散光模糊，分别。此外，对于模拟的视差模糊的可比较的幅度，在（LE：180，RE：90和LE：90，RE：180）条件下的立体阈值类似于在（LE：45，RE：135和LE：135，RE：45）条件下的立体阈值。这些结果表明，水平视差的计算包括调整到非垂直方向的视差机制的实质性贡献。模拟使用一个修改版本的结晶度-能量模型[钱，N.，和朱，Y.（1997年）。双眼视差的生理计算。Vision Research，37，1811-1827]，表明（1）需要跨被调谐到垂直和非垂直取向的视差机制的池化来解释我们的数据，以及（2）该池化可以提供对空间变化的水平视差进行编码所需的空间分辨率。
To understand the role that orientation-tuned disparity-sensitive mechanisms play in the perception of stereoscopic depth, we measured stereothresholds using two sets of random-dot stimuli that produce identical stimulation of disparity mechanisms tuned to vertical orientation but dissimilar stimulation of disparity mechanisms tuned to non-vertical orientations. Either 1 or 1.5D of astigmatic blur was simulated in the random-dot images presented to both eyes, using two axis configurations. In the parallel-axis conditions, the axis of simulated astigmatic blur was same in the two eyes (0, 45 or 135 o[rientation]deg). In the orthogonal-axis conditions, the axes of astigmatic blur were orthogonal in the two eyes (LE: 180, RE: 90; LE: 90, RE: 180; LE: 45, RE: 135; and LE: 135, RE: 45). Whereas the stimulation of disparity mechanisms tuned to near-vertical orientations should be similar in the oblique parallel- and orthogonal-axis conditions, the stimulation of non-vertically tuned disparity mechanisms should be dissimilar. Measured stereothresholds were higher in the orthogonal compared to the parallel-axis condition by factors of approximately 2 and 5, for 1 and 1.5D of simulated oblique astigmatic blur, respectively. Further, for comparable magnitudes of simulated astigmatic blur, stereothresholds in the (LE: 180, RE: 90 and LE: 90, RE: 180) conditions were similar to those in the (LE: 45, RE: 135 and LE: 135, RE: 45) conditions. These results suggest that the computation of horizontal disparity includes substantial contributions from disparity mechanisms tuned to non-vertical orientations. Simulations using a modified version of a disparity-energy model [Qian, N., & Zhu, Y. (1997). Physiological computation of binocular disparity. Vision Research, 37, 1811–1827], show (1) that pooling across disparity mechanisms tuned to vertical and non-vertical orientations is required to account for our data and (2) that this pooling can provide the spatial resolution needed to encode spatially changing horizontal disparities.