Division of Science, Psychology Program, New York University Abu Dhabi, Abu Dhabi 129188, United Arab Emirates.
Department of Psychology, Princeton University, Princeton, NJ 08540.
Proc Natl Acad Sci U S A. 2024 Sep 10;121(37):e2411293121. doi: 10.1073/pnas.2411293121. Epub 2024 Sep 5.
The presaccadic preview of a peripheral target enhances the efficiency of its postsaccadic processing, termed the extrafoveal preview effect. Peripheral visual performance-and thus the quality of the preview-varies around the visual field, even at isoeccentric locations: It is better along the horizontal than vertical meridian and along the lower than upper vertical meridian. To investigate whether these polar angle asymmetries influence the preview effect, we asked human participants to preview four tilted gratings at the cardinals, until a central cue indicated which one to saccade to. During the saccade, the target orientation either remained or slightly changed (valid/invalid preview). After saccade landing, participants discriminated the orientation of the (briefly presented) second grating. Stimulus contrast was titrated with adaptive staircases to assess visual performance. Expectedly, valid previews increased participants' postsaccadic contrast sensitivity. This preview benefit, however, was inversely related to polar angle perceptual asymmetries; largest at the upper, and smallest at the horizontal meridian. This finding reveals that the visual system compensates for peripheral asymmetries when integrating information across saccades, by selectively assigning higher weights to the less-well perceived preview information. Our study supports the recent line of evidence showing that perceptual dynamics around saccades vary with eye movement direction.
外周目标的前眼跳预览会提高其眼跳后处理的效率，这种现象被称为“超视野预览效应”。即使在等偏置位置，外周视觉性能（以及预览质量）也会在视野周围发生变化：水平方向优于垂直方向，下方优于上方。为了研究这些极角不对称性是否会影响预览效果，我们要求人类参与者在卡片上预览四个倾斜的光栅，直到中央提示指示要注视哪个光栅。在眼跳过程中，目标方向要么保持不变，要么稍微改变（有效/无效预览）。眼跳后，参与者辨别第二个光栅（短暂呈现）的方向。使用自适应阶梯来滴定刺激对比度，以评估视觉性能。正如预期的那样，有效预览提高了参与者的眼跳后对比度敏感度。然而，这种预览优势与极角感知不对称性成反比；在上方最大，在水平方向最小。这一发现表明，视觉系统在跨眼跳整合信息时会对感知不对称性进行补偿，通过选择性地为感知较差的预览信息分配更高的权重。我们的研究支持了最近的一系列证据，这些证据表明，眼跳周围的感知动态会随眼球运动方向而变化。
