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首页> 外文期刊>NeuroImage >Anticipatory processes in brain state switching - Evidence from a novel cued-switching task implicating default mode and salience networks
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Anticipatory processes in brain state switching - Evidence from a novel cued-switching task implicating default mode and salience networks

机译：脑状态切换中的预期过程-来自涉及默认模式和显着网络的新型提示切换任务的证据

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The default mode network (DMN) is the core brain system supporting internally oriented cognition. The ability to attenuate the DMN when switching to externally oriented processing is a prerequisite for effective performance and adaptive self-regulation. Right anterior insula (rAI), a core hub of the salience network (SN), has been proposed to control the switching from DMN to task-relevant brain networks. Little is currently known about the extent of anticipatory processes subserved by DMN and SN during switching. We investigated anticipatory DMN and SN modulation using a novel cued-switching task of between-state (rest-to-task/task-to-rest) and within-state (task-to-task) transitions. Twenty healthy adults performed the task implemented in an event-related functional magnetic resonance imaging (fMRI) design. Increases in activity were observed in the DMN regions in response to cues signalling upcoming rest. DMN attenuation was observed for rest-to-task switch cues. Obversely, DMN was up-regulated by task-to-rest cues. The strongest rAI response was observed to rest-to-task switch cues. Task-to-task switch cues elicited smaller rAI activation, whereas no significant rAI activation occurred for task-to-rest switches. Our data provide the first evidence that DMN modulation occurs rapidly and can be elicited by short duration cues signalling rest- and task-related state switches. The role of rAI appears to be limited to certain switch types - those implicating transition from a resting state and to tasks involving active cognitive engagement
机译：默认模式网络（DMN）是支持内部定向认知的核心大脑系统。切换到面向外部的处理时，衰减DMN的能力是有效性能和自适应自我调节的先决条件。右前岛（rAI）是显着网络（SN）的核心枢纽，已被提出来控制从DMN到任务相关的大脑网络的转换。当前，关于DMN和SN在切换期间服务的预期过程的程度知之甚少。我们使用状态（静止到任务/任务到静​​止）和状态内（任务到任务）过渡的新型提示切换任务研究了预期的DMN和SN调制。二十名健康的成年人执行了与事件相关的功能磁共振成像（fMRI）设计中执行的任务。响应信号提示即将到来的休息，在DMN地区观察到了活动的增加。对于其余任务切换提示，观察到DMN衰减。相反，DMN受到任务到静止提示的上调。观察到对休息至任务切换提示的最强rAI响应。任务到任务的切换提示引起较小的rAI激活，而任务到休息的切换未发生明显的rAI激活。我们的数据提供了DMN调制迅速发生的初步证据，并且可以由信号持续时间和任务相关的状态切换的短时提示来引发。 rAI的作用似乎仅限于某些转换类型-暗示从静止状态过渡到涉及主动认知参与的任务

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