Brief Reports: The role of temporal predictability in the anticipatory biasing of sensory cortex during visuospatial shifts of attention
Brief Reports: The role of temporal predictability in the anticipatory biasing of sensory cortex during visuospatial shifts of attention
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DOI：
10.1111/j.1469-8986.2010.01025.x
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发表时间：
2010-11-01
期刊：
影响因子：
3.7
通讯作者：
McDonald, John J.
中科院分区：
文献类型：
--
作者：
Green, Jessica J.;McDonald, John J.
注意导向线索的呈现诱发了一种偏侧化的ERP偏转，称为晚期注意导向积极性（LDAP）和α-波段脑电图振荡的偏侧化变化。这两种电生理反应都独立地与预期即将到来的目标时视觉皮层的偏置有关。然而，LDAP并不总是被观察到，ERP和α波段调制之间的联系仍然不清楚。在这里，我们研究了提前知道的目标发病的时间对ERP和α-波段反应线索的影响。只有当注意力引导线索准确地指示目标出现的时间时，LDAP才存在，而无论线索提供的时间信息如何，都观察到两个连续的注意力相关的α-波段调制。因此，α-波段活动可能是一个更可靠的指标的前目标偏置的视觉皮层活动比偏侧ERP的影响。
The presentation of an attention-directing cue elicits a lateralized ERP deflection called the late directing attention positivity (LDAP) and lateralized changes in alpha-band elelctroencephalogram oscillations. Both of these electrophysiological responses have been independently linked to biasing of visual cortex in anticipation of an impending target. However, the LDAP is not always observed, and the link between the ERP and alpha-band modulations remains unclear. Here, we examined the effect of advance knowledge of the time of target onset on the ERP and alpha-band responses to cues. The LDAP was present only when the attention-directing cues accurately indicated the time of target appearance, whereas two sequential attention-related alpha-band modulations were observed regardless of the temporal information provided by the cues. Thus, alpha-band activity may be a more reliable index of pretarget biasing of visual cortical activity than lateralized ERP effects.