Default mode network

Extracted Attributes

• Field

  Neuroscience

• Alternative Names

  Default network, default state network, medial frontoparietal network (M-FPN), task-negative network

• Measurement Tools

  Functional MRI (fMRI), Positron Emission Tomography (PET), EEG

• Primary Functions

  Internal mentation, self-reflection, episodic memory, future planning, mind-wandering

• Clinical Significance

  Associated with Alzheimer's disease, autism spectrum disorder, PTSD, depression, and schizophrenia

• Key Anatomical Regions

  Medial prefrontal cortex, posterior cingulate cortex, precuneus, angular gyrus, inferior parietal lobule

Timeline

• Hans Berger expresses the idea that the brain is constantly active even without distinct mental activity. (Source: Web Search (Neuroscientifically Challenged))

  1930-01-01

• David Ingvar begins accumulating data showing that cerebral blood flow during resting states follows specific patterns. (Source: Web Search (Neuroscientifically Challenged))

  1970-01-01

• Shulman et al. identify the network through resting-state functional MRI (fMRI) studies. (Source: Web Search (ScienceDirect))

  1997-01-01

• Raichle et al. formally identify and name the default mode network as a consistently active resting-state network. (Source: Web Search (ScienceDirect))

  2001-01-01

• Publication of educational materials detailing the hypothesized anatomy and functions of the DMN. (Source: Web Search (YouTube))

  2025-01-31

Default mode network

In neuroscience, the default mode network (DMN), also known as the default network, default state network, or anatomically the medial frontoparietal network (M-FPN), is a large-scale brain network primarily composed of the medial prefrontal cortex, posterior cingulate cortex, precuneus and angular gyrus. It is best known for being active when a person is not focused on the outside world and the brain is at wakeful rest, such as during daydreaming and mind-wandering. It can also be active during detailed thoughts related to external task performance. Other times that the DMN is active include when the individual is thinking about others, thinking about themselves, remembering the past, and planning for the future. The DMN creates a coherent "internal narrative" central to the construction of a sense of self. The DMN was originally noticed to be deactivated in certain goal-oriented tasks and was sometimes referred to as the task-negative network, in contrast with the task-positive network. This nomenclature is now widely considered misleading, because the network can be active in internal goal-oriented and conceptual cognitive tasks. The DMN has been shown to be negatively correlated with other networks in the brain such as attention networks. Evidence has pointed to disruptions in the DMN of people with Alzheimer's disease and autism spectrum disorder. Psilocybin produces the largest changes in areas of the DMN associated with neuropsychiatric disorders.

Web Search Results

• 2-Minute Neuroscience: Default Mode Network - YouTube

  TRANSCRIPT Default mode network is a term used to describe interconnected regions of the brain that display suppressed activity during cognitively demanding tasks focused on external stimuli, and higher activity during states of quiet wakefulness and when someone engages in internally focused thought such as daydreaming or the recall of personal experiences. There is no consensus on what structures make up the default mode network, but it’s thought to include regions in the medial prefrontal cortex, posterior cingulate cortex, precuneus, and lateral parietal cortex as well as other structures. [...] # 2-Minute Neuroscience: Default Mode Network ## Neuroscientifically Challenged 686000 subscribers 1047 likes ### Description 39711 views Posted: 31 Jan 2025 Default mode network is a term used to describe interconnected regions of the brain that display suppressed activity during cognitively demanding tasks focused on external stimuli, and higher activity during states of quiet wakefulness and when someone engages in internally focused thought such as daydreaming or the recall of personal experiences. In this video, I discuss the hypothesized anatomy and functions of the default mode network. Learn more on my website: WATCH MORE [...] شبكة الوضع الافتراضي هي مصطلح يستخدم لوصف المناطق المترابطة من الدماغ التي تعرض نشاطًا مكبوتًا أثناء المهام التي تتطلب جهدًا معرفيًا والتي تركز على المحفزات الخارجية، ونشاطًا أعلى أثناء حالات اليقظة الهادئة وعندما ينخرط شخص ما في تفكير مركَّز داخليًا مثل أحلام اليقظة أو تذكر الأشياء. تجارب شخصية . لا يوجد إجماع على الهياكل التي تشكل شبكة الوضع الافتراضي، ولكن يُعتقد أنها تشمل مناطق في قشرة الفص الجبهي الإنسي، والقشرة الحزامية الخلفية، والطلل، والقشرة الجدارية الجانبية بالإضافة إلى الهياكل الأخرى. تم التعرف على نمط النشاط الفريد لشبكة الوضع الافتراضي لأول مرة في أواخر التسعينيات، ومنذ ذلك الحين حاول قدر كبير من الأبحاث فهم تشريح الشبكة ووظائفها. يشير هذا البحث إلى أن شبكة الوضع الافتراضي قد تكون نشطة أثناء العديد من المهام التي تركز داخليًا مثل استرجاع الذكريات، وتصور الأحداث المستقبلية،

• Know Your Brain: Default Mode Network

  Thus, the default mode network is a group of brain regions that seem to show lower levels of activity when we are engaged in a particular task such as paying attention, but higher levels of activity when we are awake and not involved in any specific mental exercise. It is during these times that we might be daydreaming, recalling memories, envisioning the future, monitoring the environment, thinking about the intentions of others, and so on—all things that we often do when we find ourselves just "thinking" without any explicit goal of thinking in mind. Additionally, recent research has begun to detect links between activity in the default mode network and mental disorders such as depression and schizophrenia (more on this below). Furthermore, therapies like meditation have received [...] The default mode network (sometimes simply called the default network) refers to an interconnected group of brain structures that are hypothesized to be part of a functional system. The default network is a relatively recent concept, and because of this there is not a complete consensus on which brain regions should be included in a definition of it. Regardless, structures that are generally considered part of the default mode network include the medial prefrontal cortex, posterior cingulate cortex, and the inferior parietal lobule. Some other structures that may be considered part of the network are the middle temporal lobe and the precuneus. ## What is the default mode network and what does it do? [...] The concept of a default mode network was developed after researchers inadvertently noticed surprising levels of brain activity in experimental participants who were supposed to be "at rest"—in other words they were not engaged in a specific mental task, but just resting quietly (often with their eyes closed). Although the idea that the brain is constantly active (even when we aren't engaged in a distinct mental activity) was clearly expressed by Hans Berger in the 1930s, it wasn't until the 1970s that brain researcher David Ingvar began to accumulate data showing that cerebral blood flow (a general measurement of brain activity) during resting states varied according to specific patterns; for example, he observed high levels of activity in the frontal lobes of participants at rest.

• Default Mode Network - an overview | ScienceDirect Topics

  Internal mentation, which includes RNT, implicates a network of brain regions called the default mode network. The default mode network is a large-scale brain network that was first identified as the network that is consistently active when the brain is not engaged in a task, as measured through resting-state functional MRI (fMRI; Raichle et al., 2001; Shulman et al., 1997). Subsequent task-based studies clarified that regions of the default mode network do increase in activity during goal directed behaviors if the fMRI task requires functions relevant to the default mode network (Andrews-Hanna et al., 2010; Laird et al., 2009; Spreng et al., 2010). Broadly, the function of the default mode network involves internal mentation, which includes mind-wandering/day-dreaming (Mason et al., [...] The Default Mode Network comprises a series of regions (medial prefrontal cortex, medial and lateral parietal cortex, and temporal lobe) that have been reliably demonstrated to show highly correlated activity (Greicius et al., 2003). There have been claims that the Default Mode Network plays an important role in self-evaluative processing, social perspective-taking, episodic memory, internal mentation and future thought/foresight (Andrews-Hanna, 2012; Whitfield-Gabrieli and Ford, 2012). Of course, one must be careful when considering proposed functional roles of the Default Mode Network. All such speculations are reverse inferences; i.e., the functional role is considered because of a partial spatial overlap between some of the regions identified within the Default Mode Network and some [...] ### 4.1.1Default mode network The default mode network guides self-referential mental activity, regulation of internal emotional state, and recollection of previous experiences (Menon, 2011; Raichle, 2015). In a sample of adolescent girls with PTSD, assault exposure was positively associated with within-network connectivity of the default mode network (Cisler et al., 2013), which may be related to internalizing or re-experiencing symptoms in youth with trauma exposure. Youth with PTSD also demonstrated reduced between network connectivity of the default mode network and a task-positive network (Patriat et al., 2016), suggesting that childhood trauma may impair efficient switching from an internal state to meet external cognitive demands. View article Read full article URL:

• The brain's default mode network - PubMed

  The brain's default mode network consists of discrete, bilateral and symmetrical cortical areas, in the medial and lateral parietal, medial prefrontal, and medial and lateral temporal cortices of the human, nonhuman primate, cat, and rodent brains. Its discovery was an unexpected consequence of brain-imaging studies first performed with positron emission tomography in which various novel, attention-demanding, and non-self-referential tasks were compared with quiet repose either with eyes closed or with simple visual fixation. The default mode network consistently decreases its activity when compared with activity during these relaxed nontask states. The discovery of the default mode network reignited a longstanding interest in the significance of the brain's ongoing or intrinsic activity.

• What we talk about when we talk about the default mode network

  The default mode network (DMN) has been widely defined as a set of brain regions that are engaged when people are in a “resting state” (left to themselves in a scanner, with no explicit task instruction). The network emerged as a scientific object in the early twenty-first century, and in just over a decade has become the focus of intense empirical and conceptual neuroscientific inquiry. In this Perspective, we contribute to the work of critical neuroscience by providing brief reflections on the birth, working life, and future of the DMN. We consider: how the DMN emerged through the convergence of distinct lines of scientific investigation; controversies surrounding the definition, function and localization of the DMN; and the lines of interdisciplinary investigation that the DMN has [...] Keywords: functional connectivity, neuroanatomy, resting state, fMRI, history of cognitive neuroscience, mind wandering ## Introduction The default mode network (DMN)—at times termed the default network (e.g., Buckner et al., 2008)—came to prominence in cognitive neuroscience as a set of brain regions that are engaged when people are in a “resting state” (left to themselves in a scanner, with no explicit task instruction). The DMN is about a decade old: it emerged in the early part of the twenty-first century—although exact dates of birth are a vexed topic when one is talking about a scientific object. Since its emergence, interest in the DMN has been intense and growing (see Figure 1). ### Figure 1. Figure 1 Figure 1