Alerting and orienting of attention without visual awareness
Alerting and orienting of attention without visual awareness
复制标题
在没有视觉意识的情况下提醒和引导注意力
DOI：
10.1016/j.concog.2012.03.012
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发表时间：
2012-06-01
影响因子：
2.4
通讯作者：
Han, Shihui
中科院分区：
文献类型：
--
作者：
Lu, Shena;Cai, Yongchun;Han, Shihui
两种类型的注意力网络，即警报和定向，分别帮助生物体在时间和空间维度上对环境事件做出反应以求生存。在这里，我们应用了超出临界融合频率的色度闪烁来解决意识对于激活两个注意力网络是否是必要的。我们发现，高频彩色闪烁尽管未能达到意识，但产生了警报和定向效应，支持注意力和意识之间的分离。此外，随着闪烁频率的增加，定向效应减弱，而警报效应保持不变。根据整个视觉层次中时间频率敏感性的系统性下降，这一发现表明，无意识警报可能与早期视觉区域的活动相关，而不是无意识定向。由于高频闪烁已被证明只能激活早期视觉皮层，因此我们认为早期视觉区域的神经激活可能足以激活两个注意力网络。 (C) 2012 Elsevier Inc. 保留所有权利。
Two types of the attentional network, alerting and orienting, help organisms respond to environmental events for survival in the temporal and spatial dimensions, respectively. Here, we applied chromatic flicker beyond the critical fusion frequency to address whether awareness was necessary for activation of the two attentional networks. We found that high-frequency chromatic flicker, despite its failure to reach awareness, produced the alerting and orienting effects, supporting the dissociation between attention and awareness. Furthermore, as the flicker frequency increased, the orienting effect attenuated whereas the alerting effect remained unchanged. According to the systematic decline in temporal frequency sensitivity across the visual hierarchy, this finding suggests that unconscious alerting might be associated with activity in earlier visual areas than unconscious orienting. Since high-frequency flicker has been demonstrated to only activate early visual cortex, we suppose that neural activation in early visual areas might be sufficient to activate the two attentional networks. (C) 2012 Elsevier Inc. All rights reserved.