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Momentary lapses of attention in multisensory environment.
Cortex ( IF 3.6 ) Pub Date : 2020-08-12 , DOI: 10.1016/j.cortex.2020.07.014
Wen Su 1 , Qiang Guo 2 , You Li 1 , Kun Zhang 1 , Yanni Zhang 1 , Qi Chen 3
Affiliation  

Momentary lapses in attention disrupt goal-directed behaviors, and have been associated with increased pre-stimulus activity in the default mode network (DMN). The human brain often encounters multisensory inputs. It remains unknown, however, whether the neural mechanisms underlying attentional lapses are supra-modal or modality-dependent. To answer this question in the present functional magnetic resonance imaging (fMRI) study, we asked participants to respond to either visual or auditory targets in a multisensory paradigm, and focused on the pre-stimulus neural signals underlying attentional lapses, which resulted in impaired task performance, in terms of both delayed RTs and behavioral errors, in different sensory modalities. Behaviorally, mean reaction times (RTs) were equivalent between the visual and auditory modality. At the neural level, increased pre-stimulus neural activity in the majority of the core DMN regions, including medial prefrontal cortex (mPFC), posterior cingulate cortex (PCC), and left angular gyrus (AG), predicted delayed RTs more effectively in the visual than auditory modality. Especially, increased pre-stimulus activity in the mPFC predicted not only delayed RTs but also errors, more effectively in the visual than auditory modality. On the other hand, increased pre-stimulus activity in the anterior precuneus predicted both prolonged RTs and errors more effectively in the auditory than visual modality. Moreover, a supra-modal mechanism was revealed in the left middle temporal gyrus (MTG), which belongs to the posterior DMN. Increased pre-stimulus neural activity in the left MTG predicted impaired task performance in both the visual and auditory modality. Taken together, the core DMN regions manifest vision-dependent mechanisms of attentional lapses while a novel region in the anterior precuneus shows audition-dependent mechanisms of attentional lapses. Moreover, left MTG in the posterior DMN manifests a supra-modal mechanism of attentional lapses, independent of the modality of sensory inputs.



中文翻译:

在多感官环境中注意力暂时消失。

注意的短暂失误破坏了针对目标的行为,并且与默认模式网络(DMN)中刺激前活动的增加有关。人脑经常遇到多感觉输入。但是,注意力缺失背后的神经机制是超模态还是依赖于模态仍是未知的。为了在当前的功能磁共振成像(fMRI)研究中回答这个问题,我们要求参与者以多感官范式对视觉或听觉目标做出反应,并将注意力集中在注意力缺失背后的刺激前神经信号上,从而导致任务受损在不同的感觉模态下,根据延迟RT和行为错误的表现。行为上,视觉和听觉方式的平均反应时间(RTs)相等。在神经层面 大多数核心DMN区域(包括内侧前额叶皮层(mPFC),后扣带回皮层(PCC)和左角回(AG))的刺激前神经活动增加,预计在视觉上比听觉方式更有效地延迟RTs。特别是,mPFC中刺激前活动的增加不仅可以预测延迟的RT,而且可以预测视觉上的误差,而不是听觉上的误差。另一方面,前视觉前刺激中增加的刺激前活动预示着听觉上的RT和错误比视觉方式更有效。此外,超模态机制被揭示在左中颞回(MTG),属于后DMN。左MTG刺激前神经活动的增加预示了视觉和听觉方式的任务表现受损。两者合计,核心DMN地区表现出视觉依赖的注意失落的机制,而前胎前的一个新区域显示了听力依赖听觉的依赖机制。此外,后DMN中的左MTG表现出注意力下降的超模态机制,与感觉输入的方式无关。

更新日期:2020-09-06
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