Why we should value the unfocused mind

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Happy Tuesday, founders,

One evening, after an hour of fighting with my brain to stop thinking about completely random thoughts, right before I was about to fall asleep, an answer to a problem I’ve been looking for in the business for weeks popped up like a light bulb.

It was one of those moments where the solution finally came up when we were not actively pursuing it. My co-founder laughed: of course, it was around your sleep.

We all have these moments: a seemingly obvious answer occurs to us when our mind wanders off, during a shower, a walk, or when we’re half asleep.

You’ve probably also wondered whether we can tap into these moments more deliberately. To increase the likelihood, we first need to understand how the default mode network (DMN) works.

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In the late 1990s, neurologist Marcus Raichle was studying brain scans at Washington University when he noticed something that didn't fit. When participants were given a task to focus on, a specific set of brain regions consistently deactivated. When the task ended, and they were left to rest, those same regions lit up again.

The assumption at the time was that resting brains were inactive. Raichle's data showed otherwise: there was a consistent, organized network that became highly active during rest, mind-wandering, and internally directed thought. In 2001, he published a paper in which he named this brain state the default mode network (DMN).

The DMN spans the medial prefrontal cortex, the posterior cingulate cortex, and the hippocampus. It becomes active when we think about others, ourselves, the past, and the future (Buckner et al., 2008). For the overthinker, the founder who rehashes a meeting on the drive home, who wakes at 2 am with a question that didn't seem urgent yesterday, this network runs at higher volume than average. The internal monologue that feels unproductive is the DMN doing what it was built to do.

The question is: Does this overdrive of DMN serve any purpose?

The DMN's primary function during mind-wandering is something neuroscientists call associative recombination: the process by which the hippocampus retrieves fragments from separate, stored memories, and the brain connects them into configurations that didn't previously exist. When two previously unconnected pieces of information suddenly cohere, the brain is pulling together traces stored separately and binding them into something new. That’s how an insight is ‘born’.

A 2024 study published in eLife by Grob and colleagues offered some of the most direct evidence yet for how this works at the structural level. Using transcranial magnetic stimulation to temporarily suppress a specific region: the angular gyrus, a hub in the posterior parietal cortex. They found that participants showed measurably reduced ability to connect previously separate information into a coherent new understanding. When the region was disrupted, so was the integration (Grob et al., 2024).

What this finding points to is that the brain system that does connective and integrative work, and it operates most freely when external task demands are low.

In 2012, Benjamin Baird and colleagues at UC Santa Barbara ran a study that made the above concrete. Participants worked on a creative problem-solving task: generating unusual uses tasks for everyday objects, a validated measure of divergent thinking. Partway through, they were split into groups:

Compared with all other conditions, the mind-wandering group showed substantial improvements in performance on the creative problems they had already been working on. The demanding task group showed no improvement. The improvement was also specific: it only appeared for problems participants had encountered before the break, not new ones introduced afterward. The DMN hadn't improved general performance. It had been processing the specific problems in the background during the wandering, and the connections it made occurred when attention was refocused (Baird et al., 2012).

Seemingly, the break gave the brain a rest, but it actually gave DMN the time and space to do creative work.

This is what is happening during the shower, the walk, the drive. The overthinker's brain, left without an immediate task, is continuously running this integration process. For founders working with genuinely complex, non-linear problems, where the answer rarely lives in direct analysis of the problem itself, it is one of the more structurally useful things a mind can do.

When our mind wanders, the default network has two subsystems that are running (see image below). The medial temporal lobe subsystem (green) draws on memory and past experience, the material for associative recombination. The medial prefrontal cortex subsystem (blue) is involved in self-referential processing and prospective thinking. Both are active during mind-wandering. The yellow hub connects them (Andrews-Hanna, 2013).

The default mode network is not your brain switching off. It is a specific, organized system that activates when external task demands drop, and its primary job is to pull together fragments from separate memories and connect them into something new.

This is why the answer arrives in the shower or on a walk, not at the desk. Focused attention narrows the cognitive search space by design, and DMN expands it.

The Baird study finds: the mind-wandering group improved on problems they had already been working on, and only those problems. The DMN was processing in the background, and the connections came up when focused attention returned.

Here are the three call-to-action points: 1. Think of undemanding time during the working week as cognitive input, and scheduling it out removes the condition the DMN needs to operate. 2. The quality of what you feed your brain across domains directly determines the range of connections it can generate. 3. The moment your best thinking tends to arrive is data worth paying attention to, because it tells you something about when your DMN is most active, and whether your schedule is working with that or against it.

Tomorrow (bonus issue of the week), we will dive into part 2 of the DMN: the second mechanism. Episodic future thinking: how the overthinker's brain simulates events that haven't happened yet, and what the neuroscience says about why some founders seem to anticipate what others only understand in hindsight.

What you broadcast and who you become are both shaped by things you didn't consciously choose. The work is in making them visible first.

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Lavena

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