Bernstein Center for Computational Neuroscience Berlin, Charité-Universitätsmedizin Berlin, Germany; Max-Planck Institute for Human Cognitive and Brain Sciences, Leipzig, Germany; Department of Neurology, Otto-von-Guericke University Magdeburg, Germany.
Max-Planck Institute for Human Cognitive and Brain Sciences, Leipzig, Germany; Department of Neurology, Otto-von-Guericke University Magdeburg, Germany; Melbourne School of Psychological Sciences, The University of Melbourne, Australia.
Neuroimage. 2013 Nov 1;81:73-80. doi: 10.1016/j.neuroimage.2013.05.040. Epub 2013 May 17.
Visual stimuli can "pop out" if they are different to their background. There has been considerable debate as to the role of primary visual cortex (V1) versus higher visual areas (esp. V4) in pop-out processing. Here we parametrically modulated the relative orientation of stimuli and their backgrounds to investigate the neural correlates of pop-out in visual cortex while subjects were performing a demanding fixation task in a scanner. Whole brain and region of interest analyses confirmed a representation of orientation contrast in extrastriate visual cortex (V4), but not in striate visual cortex (V1). Thus, although previous studies have shown that human V1 can be involved in orientation pop-out, our findings demonstrate that there are cases where V1 is "blind" and pop-out detection is restricted to higher visual areas. Pop-out processing is presumably a distributed process across multiple visual regions.
如果视觉刺激与背景不同，它们可能会“跳出”。对于初级视觉皮层（V1）和更高的视觉区域（尤其是 V4）在弹出处理中的作用，一直存在相当大的争议。在这里，我们参数化地调节了刺激和背景的相对方向，以在受试者在扫描仪中执行一项要求高的注视任务时，研究视觉皮层中的弹出神经关联。全脑和感兴趣区域分析证实了在外节视觉皮层（V4）中存在方向对比度的表示，但在纹状视觉皮层（V1）中则没有。因此，尽管先前的研究表明，人类 V1 可能参与方向弹出，但我们的发现表明，在某些情况下，V1 是“盲”的，并且弹出检测仅限于更高的视觉区域。弹出处理大概是一个跨越多个视觉区域的分布式过程。
