Attention and oculomotor control: A high-density ERP study of the gap effect
Attention and oculomotor control: A high-density ERP study of the gap effect
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DOI：
10.1016/s0028-3932(97)00016-x
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发表时间：
1997-06-01
期刊：
影响因子：
2.6
通讯作者：
Tucker, LA
中科院分区：
文献类型：
--
作者：
Csibra, G;Johnson, MH;Tucker, LA
在GAP范式中，健康的成年受试者在注视刺激保持开启(重叠试验)或在靶点开始之前关闭(GAP试验)的情况下，对外围目标进行视觉触发的扫视。所有受试者在GAP试验中都表现出更快的反应时间(GAP效应)。高密度头皮事件相关电位被记录到时间锁定的目标刺激和前夜运动开始。我们观察到GAP效应的三个神经相关因素：(I)在靶子呈现之前的额叶前部正性，这可能反映了特定的准备过程；(Ii)在GAP试验中，对周围靶子的早期皮质视觉反应(P1)的增强；以及(Iii)重叠试验中相对于GAP试验的顶叶活动的延长。这些结果表明，有几个因素导致了差距效应，每个因素都有自己的神经基础。(C)1997年爱思唯尔科学有限公司。
In a gap paradigm, healthy adult subjects performed visually triggered saccades to peripheral targets either with the fixation stimulus remaining on (overlap trials) or going off before target onset (gap trials). All subjects showed faster reaction times in the gap trials (the gap effect). High density scalp event-related potentials were recorded time-locked to both the target stimuli and the eve movement onset. We observed three neural correlates of the gap effect: (i) a prefrontal positivity that precedes the target presentation which may reflect specific preparatory processes, (ii) an enhancement of the early cortical visual responses (P1) to the peripheral target in the gap trials, and (iii) a prolongation of parietal activity in the overlap trials relative to the gap trials prior to the saccade execution. These results suggest that several factors contribute to the gap effect, each having its own neural basis. (C) 1997 Elsevier Science Ltd.