You are trying to focus on a task, but your mind drifts. A past conversation resurfaces, a future scenario starts playing out or you get caught in a loop of thoughts that seem to run on their own. This mental activity isn't random. In fact, it reflects the activation of a specific pattern: the Default Mode Network (DMN). But what happens when this internal activity feels constant or intrusive? Can the DMN become overactive? And if so, can it be regulated? We uncover those questions below.
Overactive DMN: is it possible to calm it down?
Can the Default Mode Network be too active? Explore the impact of an overactive DMN on attention and strategies to support better cognitive balance.
OVERVIEW.
KEY TAKEAWAYS.
The Default Mode Network (DMN) supports internally oriented cognition such as self-referential thinking, memory and future simulation.
Overactive DMN is not a clinical diagnosis, but a simplified way to describe altered activity or connectivity patterns.
Cognitive function depends on dynamic interactions between networks, rather than the activity of a single network.
Persistent mind-wandering or rumination may reflect reduced flexibility in shifting between internal and task-focused states.
Altered DMN patterns have been associated with conditions such as depression, anxiety and ADHD, but these relationships are not causal.
Approaches such as mindfulness, neurofeedback and sleep regulation may help modulate these dynamics, although effects remain context-dependent.
01
What is the Default Mode Network (DMN)?
DEFINITION.
The Default Mode Network refers to a set of interconnected brain regions that show increased activity when attention isn't directed toward the external environment.
Since its formal identification by researchers [1], the DMN has been consistently associated with internally oriented cognitive processes, including:
self-referential thinking;
autobiographical memory;
imagining future events.
When you replay a scene after it ends or imagine how a meeting might go tomorrow, your DMN is engaged.
Rather than being inactive at rest, the brain is highly organised in this state. Large-scale imaging studies show that the DMN forms a coherent network supporting spontaneous cognition and internal narrative processes [2][3].
02
What does "overactive DMN" really mean?
OVERACTIVITY.
The expression "overactive DMN" is widely used, but it does not correspond to a clinical definition or a medical diagnosis. In neuroscience, what researchers actually measure is:
activity levels via fMRI or EEG signals;
functional connectivity to understand how regions interact within and across networks.
What is often described as overactivity for the Default Mode Network may refer to:
increased connectivity within the DMN;
reduced ability to disengage from internally generated thoughts;
decreased flexibility between large-scale networks.
Recent research increasingly shows that cognitive function depends less on the activity of one network and more on the balance between large-scale networks, particularly the DMN, the salience network and the frontoparietal control network [4][5].
03
Overactive DMN symptoms: what does it actually feel like?
SYMPTOMS.
In this context, the term "symptoms" doesn't refer to a clinical condition. It describes subjective experiences that may be associated with certain neural patterns, such as:
persistent mind-wandering;
repetitive or ruminative thoughts;
difficulty staying present;
mental fatigue without clear effort.
In everyday life, it can appear as opening your laptop to work, but realising after 10 minutes that you've been mentally replaying a past situation instead of focusing.
If you recognise yourself in those situations, the key question is not "is something wrong with my brain?", but rather "how easily can I bring my attention back when it drifts?".
Neuroscientific research on mind-wandering shows that internally generated thoughts can become intrusive and negatively oriented, especially when they are repetitive [6][7].
04
How does an overactive DMN affect daily concentration?
CONCENTRATION.
The Default Mode Network is not constantly on or off. Instead, it interacts with other networks, particularly those involved in attention and cognitive control.
Studies have shown that:
the DMN is often anti-correlated with task-positive networks;
when attention networks are engaged, DMN activity typically decreases [8].
This balance allows for flexible switching between internal and external modes of cognition. When this dynamic is disrupted, individuals may notice:
difficulty sustaining attention;
intrusive thoughts during tasks;
reduced efficiency.
A simple test could be to observe your pattern. If you often snap back to a task after realising your mind wandered, your system is working. If you stay stuck in internal thoughts for long periods, flexibility may be reduced.
05
Is an overactive DMN linked to specific conditions?
CONDITIONS.
Research has identified associations between DMN patterns and several conditions such as:
depression where increased DMN connectivity has been linked to rumination [9][10];
anxiety, involving altered interactions between internal thought and emotional processing [11];
ADHD, where differences appear in network switching and regulation [12].
However, these findings describe associations, not causes. The DMN is part of a broader system.
06
How can we regulate the Default Mode Network?
REGULATION.
Several approaches have been studied for their potential to modulate DMN dynamics:
Mindfulness practices
Research suggests that mindfulness training can alter how the DMN interacts with attention and salience networks. Regular practice may support greater awareness of spontaneous thoughts, reducing the tendency toward habitual rumination [13].
Neurofeedback
Neurofeedback allows individuals to observe their own brain activity in real time and learn to modulate specific patterns. Some protocols have targeted DMN-related markers, with early results suggesting potential effects on self-regulation and emotional processing [14].
Goal-directed tasks
Engaging in structured, meaningful activities that require sustained attention can naturally shift the balance away from internally generated thought. This is consistent with the anti-correlation observed between the DMN and task-positive networks.
Stress regulation
Chronic stress has been associated with heightened DMN connectivity and increased rumination. Approaches that reduce physiological and psychological stress may support a more flexible balance between brain networks [15].
Sleep and cognitive recovery
Sleep plays a central role in restoring cognitive function and maintaining network balance. Disrupted sleep patterns have been associated with altered DMN activity and reduced attentional control [16].
Psychedelics and pharmacology
Emerging research has investigated the effects of certain compounds on DMN activity. Some studies suggest that psychedelics may temporarily reduce DMN connectivity, potentially facilitating shifts in self-referential processing [17][18]. However, these effects are context-dependent and are currently explored primarily in clinical settings.
07
Why you don't want to turn off your DMN
BALANCE.
It may be tempting to view the DMN as something to silence. However, without it, you would lose essential cognitive functions:
your sense of identity;
your ability to plan;
your capacity for imagination.
Current models suggest that the Default Mode Network integrates information across memory, language and self-related processes, making it central to human cognition [4]. What matters is learning to move in and out of it fluidly.
08
What does current neuroscience still not fully understand about the DMN?
OPEN QUESTIONS.
Despite extensive research on the Default Mode Network, major questions remain:
What defines optimal DMN activity?
How do individual differences shape its function?
What is the causal relationship between DMN patterns and behaviour?
Recent work suggests that what we call the DMN may actually include several interacting subsystems, each contributing to different aspects of cognition [3][5].
Moreover, there is no universal threshold for what counts as an overactive Default Mode Network.
09
How can Neuromind support DMN neuromodulation?
NEUROMIND.
Using a real-time brain-computer interface, Neuromind's device combines EEG signals, physiological data and immersive virtual environments within a closed-loop system. By tracking key biomarkers, the platform supports personalised neuromodulation protocols.
Our platform is designed for:
clinical research, where objective biomarkers are needed;
clinical applications, including mood disorders, ADHD or chronic pain;
performance contexts, where attention and cognitive readiness are critical.
Learn more about our DMN neuromodulation research.
Explore our clinical use cases in depression treatment and addiction treatment, or browse all use cases.
Want to learn more? Contact us.
FURTHER READING.
There is currently no direct way to measure DMN activity outside of research settings. In everyday life, you may notice patterns like frequent mind-wandering or rumination. However, these experiences are not diagnostic indicators, they can reflect many different cognitive and emotional processes.
References
[1] Raichle ME, MacLeod AM, Snyder AZ, Powers WJ, Gusnard DA, Shulman GL. A default mode of brain function. Proc Natl Acad Sci U S A. 2001 Jan 16;98(2):676-82.
[2] Buckner RL, Andrews-Hanna JR, Schacter DL. The brain’s default network: anatomy, function, and relevance to disease. Ann N Y Acad Sci. 2008 Mar;1124:1-38. doi: 10.1196/annals.1440.011.
[3] Andrews-Hanna JR, Reidler JS, Sepulcre J, Poulin R, Buckner RL. Functional-anatomic fractionation of the brain’s default network. Neuron. 2010 Feb 25;65(4):550-62. doi: 10.1016/j.neuron.2010.02.005.
[4] Menon V. 20 years of the default mode network: A review and synthesis. Neuron. 2023 Aug 16;111(16):2469-2487. doi: 10.1016/j.neuron.2023.04.023.
[5] Uddin LQ, Yeo BTT, Spreng RN. Towards a Universal Taxonomy of Macro-scale Functional Human Brain Networks. Brain Topogr. 2019 Nov;32(6):926-942. doi: 10.1007/s10548-019-00744-6.
[6] Christoff K, Irving ZC, Fox KC, Spreng RN, Andrews-Hanna JR. Mind-wandering as spontaneous thought: a dynamic framework. Nat Rev Neurosci. 2016 Nov;17(11):718-731. doi: 10.1038/nrn.2016.113.
[7] Smallwood J, Schooler JW. The science of mind wandering: empirically navigating the stream of consciousness. Annu Rev Psychol. 2015 Jan 3;66:487-518. doi: 10.1146/annurev-psych-010814-015331.
[8] Fox MD, Snyder AZ, Vincent JL, Corbetta M, Van Essen DC, Raichle ME. The human brain is intrinsically organized into dynamic, anticorrelated functional networks. Proc Natl Acad Sci U S A. 2005 Jul 5;102(27):9673-8.
[9] Sheline YI, Barch DM, Price JL, Rundle MM, Vaishnavi SN, Snyder AZ, Mintun MA, Wang S, Coalson RS, Raichle ME. The default mode network and self-referential processes in depression. Proc Natl Acad Sci U S A. 2009;106(6):1942-7.
[10] Hamilton JP, Farmer M, Fogelman P, Bhatt M, Gotlib IH. Default-mode and task-positive network activity in major depressive disorder. Biol Psychiatry. 2015;70(4):334-342.
[11] Sylvester CM, Corbetta M, Raichle ME, Rodebaugh TL, Schlaggar BL, Sheline YI, Zorumski CF, Lenze EJ. Functional network dysfunction in anxiety and anxiety disorders. Trends Neurosci. 2012 Sep;35(9):527-535.
[12] Castellanos FX, Aoki Y. Intrinsic Functional Connectivity in Attention-Deficit/Hyperactivity Disorder: A Science in Development. Biol Psychiatry Cogn Neurosci Neuroimaging. 2016 May;1(3):253-261. doi: 10.1016/j.bpsc.2016.03.004.
[13] Rahrig H, Vago DR, Passarelli MA, Auten A, Lynn NA, Brown KW. Meta-analytic evidence that mindfulness training alters resting state default mode network connectivity. Sci Rep. 2022 Jul 18;12(1):12260. doi: 10.1038/s41598-022-15195-6.
[14] Treves IN, Greene KD, Bajwa Z, Wool E, Kim N, Bauer CCC, Bloom PA, Pagliaccio D, Zhang J, Whitfield-Gabrieli S, Auerbach RP. Mindfulness-based neurofeedback: A systematic review of EEG and fMRI studies. Imaging Neurosci (Camb). 2024 Dec 20;2:imag-2-00396. doi: 10.1162/imag_a_00396.
[15] Azarias FR, Almeida GHDR, de Melo LF, Rici REG, Maria DA. The Journey of the Default Mode Network: Development, Function, and Impact on Mental Health. Biology (Basel). 2025 Apr 10;14(4):395. doi: 10.3390/biology14040395.
[16] De Havas JA, Parimal S, Soon CS, Chee MW. Sleep deprivation reduces default mode network connectivity and anti-correlation during rest and task performance. Neuroimage. 2012 Jan 16;59(2):1745-51. doi: 10.1016/j.neuroimage.2011.08.026.
[17] Carhart-Harris RL, Erritzoe D, Williams T, Stone JM, Reed LJ, Colasanti A, et al. Neural correlates of the psychedelic state as determined by fMRI studies with psilocybin. Proc Natl Acad Sci U S A. 2012;109(6):2138-43.
[18] Palhano-Fontes F, Andrade KC, Tofoli LF, Santos AC, Crippa JA, Hallak JE, Ribeiro S, de Araujo DB. The psychedelic state induced by ayahuasca modulates the activity and connectivity of the default mode network. PLoS One. 2015 Feb 18;10(2):e0118143. doi: 10.1371/journal.pone.0118143.
Contact. If you would like further information or a demonstration of our solution, please contact us using the following link