When the Mind Wanders: Spontaneous vs. Deliberate Wandering
The Attention Series, Part Three
My mind wanders. Like a lot.
I wish I could tell you that as I sat down to write this essay, I slipped into a steady state of focus, that the words lined up neatly in my head like attentive little ducks. But if I’m honest, I’ve been ping-ponging between tabs, half-drafted projects, an unfinished text thread, and a few personal things taking up mental space. I do have ADHD after all.
Mind-wandering is getting more attention in research lately, and for good reason. It’s such a universal experience — we all drift — but for those of us with ADHD, the drifting can feel more like being swept out by the current. Sometimes it’s energizing, creative, even soothing. Other times, it’s exhausting. It can pull us into rumination, guilt, or that sense of I’m here but not really here.
So today, I wanted to slow down and sit with this question a bit more:
What exactly is mind-wandering? Why does it happen so much in ADHD? And is it something to work with, contain, fight, fix — or perhaps could there be a way to befriend it?
Table of Contents
The Brain’s Default Setting
To talk about wandering, it’s helpful to first talk about the Default Mode Network (DMN). This is a set of brain regions — including the medial prefrontal cortex and the posterior cingulate cortex — that light up when the brain is “at rest,” not engaged in a specific task.
You can think of it as the brain’s idle mode. When we’re daydreaming, replaying conversations, planning, or drifting inward, the DMN hums along in the background. When we switch to a focused, goal-directed task, another system — the Executive Control Network (ECN) — is supposed to take the lead, while the DMN quiets down.
In a non-ADHD brain, these two networks tend to take turns with more ease — when the Executive Control Network steps up for a task, the Default Mode Network intuitively quiets down and lets it lead. It’s a kind of internal choreography, guided by the brain’s salience system — the part that decides what deserves our attention in the moment. In other words, the switching is smoother, the handoff more fluid.
In ADHD, that dance is a little less coordinated. The DMN doesn’t always quiet when it should, and the ECN doesn’t always hold its lead. It’s a bit like two partners both trying to lead — stepping on each other’s toes, pulling in different directions. The result is what researchers call spontaneous mind-wandering: unplanned, task-unrelated thoughts that intrude even when focus is most needed.
When the Mind Wanders Too Much
A group of researchers — Bozhilova, Michelini, Kuntsi, and Asherson (2018) — proposed what they call the Mind-Wandering Hypothesis of ADHD. They suggest that excessive, spontaneous mind-wandering is a measurable component of ADHD, and that it may actually explain many of our classic experiences: distractibility, forgetfulness, difficulty sustaining attention.
In their model, the DMN doesn’t deactivate properly during tasks, leading to a constant background hum of self-generated thought. That’s why, even while reading or listening, our attention can suddenly “untether” from the moment. One moment we’re tracking the words on a page, the next we’re mentally redesigning the living room or reliving an awkward conversation from three years ago.
This is called perceptual decoupling — when attention turns inward, the brain temporarily tunes out sensory input. It’s why someone can be talking to us and we genuinely don’t register what they said. The signal simply doesn’t reach conscious awareness.
The more spontaneous mind-wandering we experience, the harder it is to regulate attention, and the more likely we are to feel mentally scattered, emotionally overloaded, or exhausted from trying so damn hard to keep the focus on the task at hand.
Two Kinds of Wandering
But here’s where things get interesting — and a little confusing: not all mind-wandering is created equal. Researchers now distinguish between spontaneous and deliberate mind-wandering.
Spontaneous mind-wandering happens unintentionally — thoughts drift without our awareness or control. It’s the “I’ve been reading the same paragraph for five minutes” kind. And here’s where it gets tricky: people often aren’t even aware they’ve drifted until something snaps them back. This lack of meta-awareness is common for everyone, but it’s especially pronounced in ADHD, where the Default Mode Network tends to hijack attention more often — and more forcefully.
Deliberate mind-wandering, on the other hand, is intentional. It’s when we choose to let our thoughts roam — like taking a mental walk to mull over a problem or spark creativity. It’s the kind that shows up in the shower, on a quiet drive, or while folding laundry — moments when the body is busy but the mind is free to drift.
Mind wandering is very common, and certainly not limited to ADHDers. One study found that up to 50% of daily thinking time is spent mind wandering (Smallwood and Schooler, 2015). What also seems true is that ADHDers experience more spontaneous mind wandering than non ADHDers. One study using the Mind Excessively Wandering Scale (MEWS) found that people with ADHD scored much higher on spontaneous mind-wandering (Bozhilova et al., 2018). In fact, many reported being unaware they’d drifted until after the fact — a lack of meta-awareness that can compound frustration and shame.
This distinction helps explain the tension between messages we hear about mind-wandering. Some clinicians, like Dr. Sasha Hamdani, describe in her Tedx Talk the benefits of activating the Default Mode Network — how allowing our brains to “idle” can restore focus and creativity. That’s not wrong; it’s just describing the deliberate kind. The research on ADHD, in contrast, focuses on the unregulated, spontaneous kind that hijacks our focus and contributes to mental fatigue.
When I think about my own attention patterns, I recognize both. There’s the spontaneous drift — the pings and pongs of thoughts that interrupt me and leave me feeling frazzled, distracted, and forgetful. But there’s also the deliberate kind — the moments of creative flow where ideas suddenly connect, or the shower insights that arrive once I’ve finally stopped trying to force a solution.
Giving our minds intentional “roam free time” — deliberate mind-wandering — may help reduce the build-up of spontaneous, intrusive mental drift. The idea is that when the brain has space to idle on its own terms, it’s less likely to hijack our focus later.
While the research is still early, this idea aligns with broader models of attention regulation and mental fatigue. It’s as if the mind, having been given its off-the-leash time, doesn’t have to bolt when we’re trying to focus. Still, research on this is emerging, and the evidence is early — but the idea feels intuitively true to many of us who live it.
Closing Reflections
If you live with ADHD, it’s easy to frame a wandering mind as either a problem to fix or a creative gift to celebrate. But for most of us, it’s both — a strength and a strain that depends on context and regulation.
The mind that wanders is also the mind that imagines, that connects distant dots, that senses patterns others might miss. The challenge isn’t to anchor it permanently, but to understand its tides — when drifting helps, and when it quietly works against us.
When the Default Mode Network has space to wander intentionally, it supports reflection, creativity, and rest. When it takes over spontaneously, it can pull us into distraction or rumination. Knowing the difference — and giving both networks their time — may be less about control and more about rhythm.
That’s often the work of attention in ADHD: learning to give our minds enough room to roam, and enough structure to come home.
Next week, I’ll continue this thread by looking more closely at what happens when a spontaneously wandering mind meets our mental health — how intentional wandering can nurture creativity, and how we can cultivate a steadier sense of agency within our drifting minds.
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References
Baird, B., Smallwood, J., Mrazek, M. D., Kam, J. W. Y., Franklin, M. S., & Schooler, J. W. (2012). Inspired by Distraction: Mind Wandering Facilitates Creative Incubation: Mind Wandering Facilitates Creative Incubation. Psychological Science, 23(10), 1117-1122. https://doi.org/10.1177/0956797612446024
Bozhilova N. S., Michelini G., Kuntsi J., & Asherson P. (2018). Mind-wandering perspective on attention-deficit/hyperactivity disorder. Neuroscience & Biobehavioral Reviews, 92, 464–476. 10.1016/j.neubiorev.2018.07.010
Deng, YQ., Li, S. & Tang, YY. The Relationship Between Wandering Mind, Depression and Mindfulness. Mindfulness 5, 124–128 (2014). https://doi.org/10.1007/s12671-012-0157-7
Mowlem F. D. et al. (2019). Validation of the Mind Excessively Wandering Scale and the Relationship of Mind Wandering to Impairment in Adult ADHD. Journal of Attention Disorders, 23(6), 624–634. https://pubmed.ncbi.nlm.nih.gov/27255536/
Seli, P., Risko, E. F., Smilek, D., & Schacter, D. L. (2016). Mind-Wandering With and Without Intention. Trends in cognitive sciences, 20(8), 605–617. https://doi.org/10.1016/j.tics.2016.05.010
Smallwood J., Schooler J.W. The science of mind wandering: empirically navigating the stream of consciousness. Ann. Rev. Psychol. 2015;66:487–518. doi: 10.1146/annurev-psych-010814-015331.https://doi.org/10.1146/annurev-psych-010814-015331
