Motion parallax from microscopic head movements during visual fixation.
Motion parallax from microscopic head movements during visual fixation.
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DOI：
10.1016/j.visres.2012.07.017
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发表时间：
2012-10-01
期刊：
影响因子：
1.8
通讯作者：
Rucci, Michele
中科院分区：
文献类型：
--
作者：
Aytekin, Murat;Rucci, Michele
在正常的观看条件下，身体姿势的调整和无意识的头部运动不断地在空间中移动眼睛。像所有的平移一样，这些运动可以产生运动视差形式的深度信息，即距离观察者不同距离的物体在视网膜上的差分运动。然而，对深度知觉的研究很少考虑这种线索的可能贡献，因为由此产生的视角变化似乎太小，不具有知觉意义。在这里，我们量化了正常站立的观察者在注视过程中存在的视差。我们通过高分辨率的头部跟踪系统测量了眼睛在太空中的轨迹，并使用眼睛的光学模型来重建观察者视网膜上的刺激。我们发现，在几米从观察者，相对较小的深度变化产生变化的速度的视网膜刺激，远高于可感知的阈值。此外，相对速度的影响很小的固定距离，目标偏心率，和精确的眼科策略，由观察员保持固定。这些结果表明，在正常的头部自由固定的视差是一个可靠的深度信息，视觉系统可以使用在各种任务的来源。
Under normal viewing conditions, adjustments in body posture and involuntary head movements continually shift the eyes in space. Like all translations, these movements may yield depth information in the form of motion parallax, the differential motion on the retina of objects at different distances from the observer. However, studies on depth perception rarely consider the possible contribution of this cue, as the resulting changes in viewpoint appear too small to be of perceptual significance. Here, we quantified the parallax present during fixation in normally standing observers. We measured the trajectories followed by the eyes in space by means of a high-resolution head-tracking system and used an optical model of the eye to reconstruct the stimulus on the observer’s retina. We show that, within several meters from the observer, relatively small changes in depth yield changes in the velocity of the retinal stimulus that are well above perceivable thresholds. Furthermore, relative velocities are little influenced by fixation distance, target eccentricity, and the precise oculomotor strategy followed by the observer to maintain fixation. These results demonstrate that the parallax available during normal head-free fixation is a reliable source of depth information, which the visual system may use in a variety of tasks.
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