Poster Session I: Vernier thresholds of a Poisson-noise-limited computational observer with and without fixational eye movements.
Poster Session I: Vernier thresholds of a Poisson-noise-limited computational observer with and without fixational eye movements.
复制标题
海报会议 I：有或没有注视眼球运动的泊松噪声限制计算观察者的游标阈值。
DOI：
10.1167/jov.23.15.42
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发表时间：
2023
影响因子：
1.8
通讯作者：
Wang M
中科院分区：
文献类型：
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作者：
Wang M
游标敏锐度是空间视觉的基本量度。我们模拟了视锥细胞的刺激编码如何限制游标敏锐度。我们确定了游标阈值的计算观察员，有机会获得泊松分布的锥形颜料激发。观察者还可以访问锥镶嵌布局和每次试验的刺激可能性。我们改变刺激对比度（100%，50%，22%，11%迈克尔逊对比度）和持续时间（2，4，9，18刺激帧;帧持续时间8.33毫秒），同时固定其他刺激特性（中央凹观看;两个无色垂直条;长度6.2弧分;宽度1弧分;垂直间隙0.1弧分）。当视网膜图像静止时，游标阈值通过对比能量共同取决于对比度和持续时间：平方对比度乘以持续时间。当计算观察者没有考虑到有关眼睛路径的信息时，引入注视漂移眼睛运动会损害性能。当注视点漂移的路径是可用的，并且被理想地使用时，与静止的情况没有明显的区别。缺乏改进时，固定漂移的路径是确切地知道可能反映了高密度的中央凹锥相对于光学点扩散函数和事实，我们没有引入时间过滤的视觉系统。我们的研究结果表明，丰富的光学之间的相互作用的可能性，锥采样，注视眼球运动，后感受器过滤和视觉性能。
Vernier acuity is a fundamental measure of spatial vision. We modeled how stimulus encoding by the cones limits Vernier acuity. We determined Vernier thresholds for a computational observer that had access to the Poisson-distributed cone photopigment excitations. The observer also had access to the cone mosaic layout and the stimulus possibilities on each trial. We varied stimulus contrast (100%, 50%, 22%, 11% Michelson contrast) and duration (2, 4, 9, 18 stimulus frames; frame duration 8.33 ms) while fixing other stimulus properties (foveal viewing; two achromatic vertical bars; length 6.2 arcmin; width 1 arcmin; vertical gap 0.1 arcmin). When the retinal image is stationary, Vernier thresholds depend jointly on contrast and duration through contrast energy: squared contrast times duration. Introducing fixational drift eye movements impairs performance, when the information about eye path is not accounted for by the computational observer. When the path of fixational drift is made available and used ideally, there is no noticeable difference with the stationary case. The lack of improvement when the path of fixational drift is known exactly may reflect the high-density of foveal cones relative to the optical point spread function and the fact that we did not introduce temporal filtering by the visual system. Our results suggest the possibility of a rich interaction between optics, cone sampling, fixational eye movements, post-receptoral filtering and visual performance.