Global feature-based attention to orientation
Global feature-based attention to orientation
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DOI：
10.1167/11.10.8
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发表时间：
2011-01-01
影响因子：
1.8
通讯作者：
Hou, Youyang
中科院分区：
文献类型：
--
作者：
Liu, Taosheng;Hou, Youyang
对运动方向的选择性注意可以调节方向选择性感觉反应的强度，无论其空间位置如何。尽管这种空间全局调制被认为是基于特征的注意力的一般属性，但很少有研究检查运动以外的视觉特征。在这里，我们使用了与注意力指令相结合的适应协议来评估对方向的注意力（早期视觉处理中的一个突出特征）是否也表现出这种空间全局调制。我们通过提示观察者注意出现在外围位置的复合光栅中的方向来调整观察者的方向。然后，我们评估了适配器从未刺激过的三个位置的倾斜后效应的大小。关注方向会在这些位置产生倾斜后效应，表明注意力在远离适配器的位置调节方向选择机制。此外，对于位于适配器不同距离和半场的测试刺激，倾斜后效应的大小没有差异。这些结果表明，对方向的注意力均匀地分布在整个视野中。因此，空间全局调制似乎是基于特征的注意力的一般属性，并且它提供了一种灵活的机制来调制整个视野中的特征显着性。
Selective attention to motion direction can modulate the strength of direction-selective sensory responses regardless of their spatial locations. Although such spatially global modulation is thought to be a general property of feature-based attention, few studies have examined visual features other than motion. Here, we used an adaptation protocol combined with attentional instructions to assess whether attention to orientation, a prominent feature in early visual processing, also exhibit such spatially global modulation. We adapted observers to an orientation by cuing them to attend to the orientation in a compound grating that was presented at a peripheral location. We then assessed the size of the tilt aftereffect at three locations that were never stimulated by the adapter. Attending to orientation produced a tilt aftereffect in these locations, indicating that attention modulated orientation-selective mechanisms in remote locations from the adapter. Furthermore, there was no difference in the magnitude of the tilt aftereffect for test stimuli that were located at different distances and hemifields to the adapter. These results suggest that attention to orientation spreads uniformly across the visual field. Thus, spatially global modulation seems to be a general property of feature-based attention, and it provides a flexible mechanism to modulate feature salience across the visual field.