Robitaille Nicolas, Jolicoeur Pierre, Dell'Acqua Roberto, Sessa Paola
Centre de Recherche en Neuropsychologie et Cognition, Département de Psychologie, Université de Montréal, Montréal, Québec, Canada.
Brain Res. 2007 Dec 14;1185:158-69. doi: 10.1016/j.brainres.2007.09.004. Epub 2007 Sep 14.
In order to investigate the interplay between visuo-spatial attention and central attention, we varied the relative probability (25% vs. 75%) of the responses to lateralized targets in an attentional blink paradigm. When the first target was associated with a less probable response, we observed a larger attentional blink, that is, a general reduction in accuracy for the second target. The efficiency of deployment of spatial attention to the second target was also reduced as a function of the response frequency for the first target. Both the N2pc, an event-related potential (ERP) associated with the deployment of attention in visual space, and the SPCN (sustained posterior contralateral negativity), an ERP associated with the maintenance of information in visual short-term memory, time-locked to T2 were significantly reduced when the first target was associated with a less frequent response. Furthermore, the P3 ERP to T2 was abolished when the response to T1 was rare but not when it was frequent. The results show that the association of T1 to either a rare or frequent response causes significant interference with the deployment of visual spatial attention to T2, and with the short-term consolidation of T2 into visual short-term memory.
为了研究视觉空间注意和集中注意之间的相互作用，我们在注意瞬脱范式中改变了对侧化目标反应的相对概率（25%对75%）。当第一个目标与不太可能的反应相关联时，我们观察到了更大的注意瞬脱，即第二个目标的准确性普遍降低。将空间注意分配到第二个目标的效率也随着第一个目标的反应频率而降低。当第一个目标与较低频率的反应相关联时，与视觉空间中注意分配相关的事件相关电位（ERP）N2pc以及与视觉短期记忆中信息维持相关的ERP持续对侧后负波（SPCN），在时间上锁定到T2时均显著降低。此外，当对T1的反应很少见时，对T2的P3 ERP消失，但当反应频繁时则不会。结果表明，T1与罕见或频繁反应的关联会对将视觉空间注意分配到T2以及将T2短期巩固到视觉短期记忆中造成显著干扰。
