Modeling V1 neuronal responses to orientation disparity
Modeling V1 neuronal responses to orientation disparity
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DOI：
10.1017/s0952523801186049
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发表时间：
2001-11-01
影响因子：
1.9
通讯作者：
Parker, AJ
中科院分区：
文献类型：
--
作者：
Bridge, H;Cumming, BG;Parker, AJ
眼间取向差异在神经元或心理物理水平上对深度知觉的贡献尚不清楚。为了理解双眼神经元对方向差异的反应，我们扩展了Ohzawa等人（1990）的能量模型，将双眼差异纳入感受野方向。该模型的反应与眼间方向差异的光栅刺激进行了检查，沿着与随机点立体图（RDS）描绘倾斜表面的反应。两眼对刺激方位组合的反应是左右可分的，这意味着对双眼方位差异的反应不一致。所有现有的神经元数据有关的方向差异可以很好地描述这种类型的模型（甚至没有视差选择性的版本）。尽管视差敏感模型需要窄的定向带宽来产生实质性调制，但是视差敏感模型对RDS倾斜的变化敏感。在这种刺激下，对倾斜不敏感的模型对倾斜没有选择性。尝试对模型进行几次修改，以提高其对取向差异和/或倾斜的选择性。一个模型建立了总结几个敏感的模型显示左右不可分割的反应，最大限度地响应一致的方向差异。尽管有这个属性，在RDS刺激倾斜的选择性并不比简单的选择性模型。这里评估的模型的范围表明，两眼间的方向差异是既不必要也不充分的信号倾斜。相比之下，在能量模型的框架内，位置视差敏感性似乎是必要的和足够的。
The contribution of interocular orientation differences to depth perception, at either the neuronal or the psychophysical level, is unclear. To understand the responses of binocular neurons to orientation disparity, we extended the energy model of Ohzawa et al. (1990) to incorporate binocular differences in receptive-field orientation. The responses of the model to grating stimuli with interocular orientation differences were examined, along with the responses to random dot stereograms (RDS) depicting slanted surfaces. The responses to combinations of stimulus orientations in the two eyes were left-right separable, which means there was no consistent response to the binocular orientation difference. All existing neuronal data concerning orientation disparity can be well described by this type of model (even a version with no disparity selectivity). The disparity sensitive model is nonetheless sensitive to changes in RDS slant, although it requires narrow orientation bandwidth to produce substantial modulation. The disparity-insensitive model shows no selectivity to slant in this stimulus. Several modifications to the model were attempted to improve its selectivity for orientation disparity and/or slant. A model built by summing several disparity-sensitive models showed left-right inseparable responses, responding maximally to a consistent orientation difference. Despite this property, the selectivity for slant in RDS stimuli was no better than the simple disparity-selective model. The range of models evaluated here demonstrate that interocular orientation differences are neither necessary nor sufficient for signaling slant. In contrast, within the framework of the energy model, positional disparity sensitivity appears to be both necessary and sufficient.