Effect of spatial attention on spatiotopic visual motion perception
Effect of spatial attention on spatiotopic visual motion perception
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DOI：
10.1167/19.4.4
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发表时间：
2019-04-01
影响因子：
1.8
通讯作者：
Takeuchi，Tatsuto
中科院分区：
文献类型：
--
作者：
Yoshimoto，Sanae;Takeuchi，Tatsuto
我们几乎从未经历过视觉不稳定，尽管眼球运动引起视网膜图像不稳定。视觉知觉的稳定性是如何通过空间主题表征来维持的仍然是一个有争议的问题。在现有的神经科学研究中，关于空间位表征的发现存在差异，部分原因在于注意力如何被分配到刺激上的差异。在这项研究中，我们从心理物理角度考察了空间注意是否需要感知空间位视觉运动。为此，我们使用了视觉运动启动，这是一种现象，在这种现象中，前面的启动刺激调节了模糊测试刺激的感知移动方向，例如相位移动180度的漂移光栅。为了检验不同坐标下的启动效应，参与者在启动物偏移后不久进行了扫视。参与者的任务是判断随后呈现的测试刺激的方向。为了控制空间注意的影响，参与者被要求在扫视后进行并发点对比变化检测任务。正启动在空间定位条件下显著，而负启动在视网膜定位条件下占主导地位。启动与测试刺激之间至少间隔600 ms才能观察到空间位坐标上的正启动。当空间注意被引导远离测试刺激位置时，空间主题正动作启动完全消失；同时，当空间注意被引导到测试刺激的位置时，在较短的刺激间隔内，空间主题正动作启动增强。这些结果证明了注意力资源对于更快地发展空间主题表征是必要的。
We almost never experience visual instability, despite retinal image instability induced by eye movements. How the stability of visual perception is maintained through spatiotopic representation remains a matter of debate. The discrepancies observed in the findings of existing neuroscience studies regarding spatiotopic representation partly originate from differences in regard to how attention is deployed to stimuli. In this study, we psychophysically examined whether spatial attention is needed to perceive spatiotopic visual motion. For this purpose, we used visual motion priming, which is a phenomenon in which a preceding priming stimulus modulates the perceived moving direction of an ambiguous test stimulus, such as a drifting grating that phase shifts by 180. To examine the priming effect in different coordinates, participants performed a saccade soon after the offset of a primer. The participants were tasked with judging the direction of a subsequently presented test stimulus. To control the effect of spatial attention, the participants were asked to conduct a concurrent dot contrast-change detection task after the saccade. Positive priming was prominent in spatiotopic conditions, whereas negative priming was dominant in retinotopic conditions. At least a 600-ms interval between the priming and test stimuli was needed to observe positive priming in spatiotopic coordinates. When spatial attention was directed away from the location of the test stimulus, spatiotopic positive motion priming completely disappeared; meanwhile, the spatiotopic positive motion priming at shorter interstimulus intervals was enhanced when spatial attention was directed to the location of the test stimulus. These results provide evidence that an attentional resource is requisite for developing spatiotopic representation more quickly.