Do these kinds of things ever happen to you?

You come up with a great idea for your business. You get maybe 20 percent of the way through executing it. Then a second great idea shows up, and suddenly idea number one is gathering dust.
You sit down to answer three emails. You answer one. Somewhere in there you also reorganize a folder, look up a flight to somewhere you’re not going, and forget why you opened your inbox in the first place.
You’re in a meeting, present in body, and about four minutes in your brain quietly checks out to go work on a completely unrelated problem, one nobody in the room asked about.

And, well — this exact article. I started drafting it, got about halfway through, then didn’t touch it again for three days. Then I opened my laptop for something completely unrelated and thought, wait, didn’t I have something I was writing?

I’ve never been diagnosed with ADHD, and from what I understand, doctors get pretty reluctant to prescribe medication for it once you’re past your early 40s or so — the theory being if you’ve made it this far figuring out your own workarounds, you probably don’t need the prescription.

Diagnosed or not, however, I’ve always been fascinated by attention and focus, both as an abstract subject and as something I actively work on. And I suspect I’m far from alone.

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That’s why a new study out of Johns Hopkins caught my attention (pun very much intended).

Researchers there found a cluster of neurons tucked deep in the brainstem — a part of the brain so old, evolutionarily speaking, that it’s shared across essentially all vertebrates — that appears to control the ability to focus by actively suppressing distractions.

Writing in Nature Communications, the team, led by neuroscientist Shreesh Mysore and postdoctoral fellow Ninad Kothari, found that when they temporarily silenced these neurons in mice, the animals became dramatically more distractible.

“A hallmark of ADHD is that even faint distractors draw attention away—and that’s exactly what we see here when these neurons are silenced,” Mysore said. “But the very next day, when the neurons are turned back on, the same animal can ignore distractors again, even very strong ones.” Fish and birds

For a long time, the working assumption was that attention was mostly a function of the prefrontal cortex — a brain region that’s only highly developed in humans and other primates.

The problem: plenty of other animals, including birds and fish, are also perfectly capable of focusing and filtering out distractions, and they don’t have a well-developed prefrontal cortex at all.

“If we really go back in evolution, for hundreds of millions of years, birds have had this ability, fish have had this ability,” Kothari said. “And they do not typically have a highly developed prefrontal cortex, so how does the brain solve this problem?”

The answer, it turns out, may be this older brainstem circuit, present across species that otherwise look nothing alike, neurologically speaking.

To test it, the researchers trained mice on a human-like attention task: focus on the visual information straight ahead, ignore the distracting information off to the side. The mice were good at it — until the researchers switched off the relevant brainstem neurons, at which point the mice, in Kothari’s words, “become hyper distractable.”

Importantly, the researchers ruled out simpler explanations, like impaired vision or motor control. The only thing that broke was the mice’s ability to weigh competing pieces of information and decide what to actually pay attention to.

“This part of the brain is like an attentional selection engine,” Mysore said. “It helps solve the question: ‘What is most important information I should pay attention to right now?'” What’s next

The researchers now want to figure out whether these same neurons exist and function the same way in humans, and eventually, whether their function is altered in people with ADHD or autism.

“All the evidence to date suggests that these neurons exist in humans too,” Mysore said. “But are they responsible for selective spatial attention in humans? An exciting hypothesis is that they play a crucial role.”

If that pans out, it could eventually point toward more targeted treatments for attention disorders, rather than the broader approaches available now.

It’s early. It’s mice, not people. But it’s a genuinely interesting finding, and exactly the kind of thing I’m interested to learn more about.

At least until the next fascinating and totally unrelated thing comes along.