Quadrantic deficit reveals anatomical constraints on selection
Quadrantic deficit reveals anatomical constraints on selection
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DOI：
10.1073/pnas.0702685104
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发表时间：
2007-08-14
影响因子：
11.1
通讯作者：
Cavanagh, Patrick
中科院分区：
文献类型：
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作者：
Carlson, Thomas A.;Alvarez, George A.;Cavanagh, Patrick
我们的意识体验是一个无缝的视觉世界，但我们视觉能力的基础是许多大脑皮层区域，它们对视觉空间的表征是支离破碎或不对称的。事实上，视野的表示被分割成V2、V3和可能的V4水平的象限。从理论上讲，这种分裂不会产生功能性后果，因此对行为没有影响。与此预期相反，我们发现强大的象限级干扰效果时，专心跟踪两个移动目标。当目标对象出现在不同的象限中（横跨水平或垂直子午线）时，与目标对象出现在相同距离但在单个象限内时相比，性能有所提高。这些象限水平的干扰效应不会被注意力和跟踪的认知理论所预测，因为这些理论没有考虑到解剖学的限制。象限水平干扰强烈地表明，包含视野的四个象限的非连续表示的皮层区域（即，V2，V3和V4）对注意选择和注意跟踪施加了重要的约束。
Our conscious experience is of a seamless visual world, but many of the cortical areas that underlie our capacity for vision have a fragmented or asymmetrical representation of visual space. In fact, the representation of the visual field is fragmented into quadrants at the level of V2, V3, and possibly V4. In theory, this division could have no functional consequences and therefore no impact on behavior. Contrary to this expectation, we find robust quadrant-level interference effects when attentively tracking two moving targets. Performance improves when target objects appear in separate quadrants (straddling either the horizontal or vertical meridian) compared with when they appear the same distance apart but within a single quadrant. These quadrant-level interference effects would not be predicted by cognitive theories of attention and tracking that do not take anatomical constraints into account. Quadrant-level interference strongly suggests that cortical areas containing a noncontiguous representation of the four quadrants of the visual field (i.e., V2, V3, and V4) impose an important constraint on attentional selection and attentive tracking.