Attentional resolution and the locus of visual awareness
Attentional resolution and the locus of visual awareness
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DOI：
10.1038/383334a0
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发表时间：
1996-09-26
期刊：
影响因子：
64.8
通讯作者：
Intriligator, J
中科院分区：
文献类型：
--
作者：
He, S;Cavanagh, P;Intriligator, J
视觉空间分辨率受到各种因素的限制，从光学到视觉皮质中的神经元过滤器(1，2)，但尚不清楚它在多大程度上也受到注意力分辨率的限制。为了研究这一点，我们研究了对特定方向线的适应，这是发生在初级视觉皮质的一个过程(3)。当一个单一的栅格出现在视野的外围时，人类观察者会意识到它的方向，但当它被其他类似的栅格包围时(“拥挤”)，它的方向就不可能被辨别出来(4，5)。然而，我们发现定向特定适应不受拥挤的影响，这意味着空间分辨率受到初级视觉皮质以外的注意过滤器的限制。与此一致，我们发现注意分辨率在下视野大于上视野，而在初级视觉皮质中没有相应的不对称性。我们认为，注意过滤器作用于一个或多个更高级的视觉皮质区域，以限制视觉信息的可获得性，使其具有意识意识(6)。
VISUAL spatial resolution is limited by factors ranging from optics to neuronal filters in the visual cortex(1,2), but it is not known to what extent it is also limited by the resolving pow er of attention. To investigate this, we studied adaptation to lines of specific orientation, a process that occurs in primary visual cortex(3). When a single grating is presented in the periphery of the visual field, human observers are aware of its orientation, but when it is flanked by other similar gratings ('crowding'), its orientation becomes impossible to discern(4,5). Nevertheless, we show that orientation-specific adaptation is not affected by crowding, implying that spatial resolution is limited by an attentional filter acting beyond the primary visual cortex. Consistent with this, we find that attentional resolution is greater in the lower than in the upper visual field, whereas there is no corresponding asymmetry in the primary visual cortex. We suggest that the attentional filter acts in one or more higher visual cortical areas to restrict the availability of visual information to conscious awareness(6).