Near-optimal integration of orientation information across saccadic eye movements.
Near-optimal integration of orientation information across saccadic eye movements.
复制标题
眼球扫视运动方向信息的近乎最佳整合。
作者：
E. Ganmor;M. Landy;Eero P. Simoncelli
视力随着偏心而迅速下降。因此，人类每秒移动眼睛几次，反复将场景的新目标区域置于中央凹的高分辨率检查之下。但是，在中央凹到达新目标之前，在外围获取的低分辨率信息会发生什么情况呢？将扫视前信息整合到扫视后估计中是有意义的，因为它只能减少内部表示的误差。但考虑到中央凹和周边之间的敏锐度差异，在正常观看条件下，扫视前的视图对估计的总体准确性的影响很小。我们使用完善的线索整合理论和实验框架来检查人类观察者是否以及在多大程度上整合了眼跳前和眼跳后的方向信息。未经训练的观察者被要求根据提示扫视两个预先确定的外围目标之一（向左或向右偏心 5 度）。在扫视之前、扫视之后或者在扫视之前和之后都可以看到定向的伽博斑块。受试者被要求确定 Gabor 相对于垂直方向是顺时针还是逆时针方向。为了最大限度地提高扫视整合的潜在收益，中心凹和周边视图之间的 Gabor 对比度有所不同（观察者不知道），并且通过实验设置，以便对于每个受试者，中心凹和周边位置的可辨别性大致相等。结果分析表明，受试者近乎最佳地整合了扫视前和扫视后的方向信息，当目标在扫视之前和之后都可见时，实现了更好的方向辨别能力。我们得出的结论是，人类配备了整合眼球扫视运动中低级视觉信息的装置。在 VSS 2015 上提交的会议摘要。
Visual acuity rapidly declines with eccentricity. Consequently humans move their eyes several times per second, repeatedly placing a new target region of the scene under the high-resolution scrutiny of the fovea. But what happens to the low resolution information acquired in the periphery just before the fovea lands on its new target? Integrating the pre-saccadic information into the post-saccadic estimate would make sense, as it can only reduce the error of the internal representation. But given the discrepancy in acuity between fovea and periphery, under normal viewing conditions the pre-saccadic view will contribute only marginally to the overall accuracy of the estimate. We used the well-established theoretical and experimental framework of cue integration to examine whether, and to what extent, human observers integrate pre- and post-saccadic orientation information. Untrained observers were asked to saccade on cue to one of two pre-determined peripheral targets (5 deg. eccentricity left or right). An oriented Gabor patch was visible either before the saccade, after the saccade, or both before and after saccade. Subjects were asked to determine whether the Gabor was oriented clockwise or counter-clockwise relative to vertical. In order to maximize the potential gain from saccadic integration, the contrast of the Gabor differed between the foveal and peripheral views (unbeknownst to the observers) and was experimentally set so that, for each subject, discriminability at the foveal and peripheral locations was approximately equal. Analysis of the results indicates that subjects integrate pre- and post-saccadic orientation information near optimally, achieving better orientation discriminability when the target is visible both before and after saccade. We conclude that humans are equipped with the apparatus to integrate low-level visual information across saccadic eye movements. Meeting abstract presented at VSS 2015.