The reference frame of the motion aftereffect is retinotopic
The reference frame of the motion aftereffect is retinotopic
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DOI：
10.1167/9.5.16
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发表时间：
2009-01-01
影响因子：
1.8
通讯作者：
Cavanagh, Patrick
中科院分区：
文献类型：
--
作者：
Knapen, Tomas;Rolfs, Martin;Cavanagh, Patrick
虽然眼睛，头部和身体的运动可以产生大规模的翻译的视觉输入的视网膜上，感知是值得注意的时空连续性。视觉系统可以通过在世界坐标系中创建一个详细的地图来实现这一点-一种空间位置表示。我们通过使观察者适应平移运动来测试运动后效的坐标系，然后在相同的视网膜和空间位置测试（1（完全后效条件），（2）在相同的视网膜位置，但在不同的空间位置（视网膜定位条件），（3）在相同的空间，但在不同的视网膜位置（空间位置条件），或（4）在不同的空间和视网膜位置（一般转移条件）。我们使用高速移动的大刺激，以最大限度地提高空间运动整合的可能性。在第二个实验中，我们增加了一个对比度递减检测任务的运动刺激，以确保注意力是针对适应的位置。强烈的运动后效被发现时，观察员进行了测试，在充分和retinotopic后效条件。我们还发现，在空间位置的后效较小，但它没有不同的位置，既不是空间也retinotopic。这种模式的结果并没有改变时，注意力明确针对适应刺激。我们的结论是，运动适应发生在视皮层的retinotopic水平，并没有时空互动的运动适应和测试发生在扫视。
Although eye-, head- and body-movements can produce large-scale translations of the visual input on the retina, perception is notable for its spatiotemporal continuity. The visual system might achieve this by the creation of a detailed map in world coordinates-a spatiotopic representation. We tested the coordinate system of the motion aftereffect by adapting observers to translational motion and then tested (1) at the same retinal and spatial location (full aftereffect condition), (2) at the same retinal location, but at a different spatial location (retinotopic condition), (3) at the same spatial, but at a different retinal location (spatiotopic condition), or (4) at a different spatial and retinal location (general transfer condition). We used large stimuli moving at high speed to maximize the likelihood of motion integration across space. In a second experiment, we added a contrast-decrement detection task to the motion stimulus to ensure attention was directed at the adapting location. Strong motion aftereffects were found when observers were tested in the full and retinotopic aftereffect conditions. We also found a smaller aftereffect at the spatiotopic location but it did not differ from that at the location that was neither spatiotopic nor retinotopic. This pattern of results did not change when attention was explicitly directed at the adapting stimulus. We conclude that motion adaptation took place at retinotopic levels of visual cortex and that no spatiotopic interaction of motion adaptation and test occurred across saccades.