Object-location binding across a saccade: A retinotopic spatial congruency bias.
Object-location binding across a saccade: A retinotopic spatial congruency bias.
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DOI：
10.3758/s13414-016-1263-8
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发表时间：
2017-04
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影响因子：
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通讯作者：
Golomb JD
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作者：
Shafer-Skelton A;Kupitz CN;Golomb JD
尽管频繁的眼球运动会迅速改变物体在视网膜上的位置，但我们的视觉系统会对世界产生稳定的感知。要做到这一点，它必须将以眼睛为中心的（视网膜）输入转换为以世界为中心的（空间）感知。此外，为了成功的行为，我们还必须在更新过程中纳入有关对象特征/身份的信息-这是一个有待理解的基本挑战。在这里，我们采用了最近的行为范式，“空间一致性偏差”，调查对象的位置绑定整个眼球运动。在两个初始的基线实验中，我们发现，空间一致性偏差是存在的，除了在原始范例中使用的对象刺激的伽柏和脸的刺激。然后，在三个主要的实验中，我们发现这种偏见在眼球运动中得到了保留，但仅在视网膜位置坐标中：当两个刺激出现在相同的视网膜位置时，受试者更有可能感知到它们具有相同的特征/身份。引人注目的是，没有证据表明在更生态相关的空间位置（以世界为中心）坐标中的位置绑定;即使在较长的扫视后延迟下，参考帧也没有更新到空间位置，也没有过渡到空间位置，具有更复杂的刺激（gabor，形状和面孔都显示出视网膜一致性偏差）。我们的研究结果表明，对象位置绑定可能与视网膜坐标有关，并且可能需要在每次眼球运动后重新建立，而不是自动更新到空间坐标。
Despite frequent eye movements that rapidly shift the locations of objects on our retinas, our visual system creates a stable perception of the world. To do this, it must convert eye-centered (retinotopic) input to world-centered (spatiotopic) percepts. Moreover, for successful behavior we must also incorporate information about object features/identities during this updating – a fundamental challenge that remains to be understood. Here we adapted a recent behavioral paradigm, the “Spatial Congruency Bias”, to investigate object-location binding across an eye movement. In two initial baseline experiments, we showed that the Spatial Congruency Bias was present for both gabor and face stimuli in addition to the object stimuli used in the original paradigm. Then, across three main experiments, we found the bias was preserved across an eye movement, but only in retinotopic coordinates: Subjects were more likely to perceive two stimuli as having the same features/identity when they were presented in the same retinotopic location. Strikingly, there was no evidence of location binding in the more ecologically relevant spatiotopic (world-centered) coordinates; the reference frame did not update to spatiotopic even at longer post-saccade delays, nor did it transition to spatiotopic with more complex stimuli (gabors, shapes, and faces all showed a retinotopic Congruency Bias). Our results suggest that object-location binding may be tied to retinotopic coordinates, and that it may need to be re-established following each eye movement rather than being automatically updated to spatiotopic coordinates.