【摘要】 目的利用事件相关电位(ERP)时空模式考察视觉注意捕获相关的神经网络活动。方法 15名受试者搜索和按键判定8个视觉项目中的一个形状特异目标,实验条件划分根据是否存在突出颜色分心物,采用配对t检验比较两种条件下的行为绩效和ERP数据。结果有突出分心物的反应时(791.20±62.22)ms显著长于无突出分心物(772.40±53.77)ms:t(14)=4.26,P<0.001。ERP的t值统计参数映像提示显著的脑区和时段包括:右侧额顶颞区(140~180 ms)、后枕区和额正中区(220~260 ms)、双侧额区(360~460 ms)。结论突出分心物产生了行为分心效应。先后激活的右腹侧和背侧注意网络共同构成了注意捕获的神经基础。更多还原

【Abstract】 Objective To investigate the neural network activities of attentional capture during a visual search task with spatiotemporal patterns of ERP. Methods Fifteen subjects were asked to search and judge a specific target from 8 items,and an irrelevant color( red or green) singleton distractor appeared on 50% of trials. Paired t-test was carried out for behavior performance and ERP data. Results The reaction time was significantly slower for the salient distractor( 791. 20 ± 62. 22 ms) compared with that of the non-salient one( 772. 40 ±53. 77 ms) : t( 14) =4. 26,P <0. 001. The statistical parametric mapping of t-value of ERP revealed significant activations in the right-lateralized frontal-parietal-temporal area( 140-180 ms),the occipital and central fronto-parietal( 220-260 ms),as well as the bilateral frontal areas( 360-460 ms). Conclusion The salient distractor results in attentional capture in behavioral performance. The right ventral attentional network is activated before the dorsal attentional network,and the activations in both networks are the neural underpinnings of attentional capture.更多还原