Why can't I focus? Blame interruptions, not a goldfish brain

Why can't I focus? If you have asked yourself that this week, you have probably also heard the stock answer: the human attention span has collapsed to about eight seconds, supposedly shorter than a goldfish's. It is a tidy, alarming story. It is also not true, and believing it points you at the wrong fix.

Where the goldfish myth came from

The eight second claim spread from a 2015 report by Microsoft's Canadian team, which lined up a human attention span of eight seconds against a goldfish's nine. When the BBC looked into it in 2017, reporter Simon Maybin found the number did not come from Microsoft's own research. It had been borrowed from a website called Statistic Brain, whose sources he could not pin down, and none of the attention scientists he contacted could find any study behind it. The goldfish half is just as weak. Fish are used in laboratories precisely because they can learn and remember, so the nine second goldfish is a myth stacked on top of a myth. The claim spread so fast partly because it felt true, since many of us do feel more scattered than we used to. But a feeling is not a measurement, and the measurement it was dressed up as never existed.

Researchers also stress that "attention span" is not a single fixed number. How long you can concentrate depends on the task, how interesting it is, how tired you are and what else is competing for your attention. So if focus feels harder than it used to, it is not because your brain has rotted to the level of pond life. Something real has changed, but it is more specific, and more fixable, than that.

What has actually changed

The better evidenced finding comes from Gloria Mark, a professor of informatics who has measured people's attention at work for two decades. She gathered her early figures the low tech way, shadowing office workers and using a stopwatch to time how long they stayed on each screen before moving on. Speaking to the American Psychological Association, she explained that in 2004 people spent on average about two and a half minutes on any screen before switching away. By 2012 that had fallen to about 75 seconds, and in recent years it has settled near 47 seconds, with the median closer to 40, as reported by the University of California.

That is a genuine, measurable shift. But look closely at what it measures: how long we stay on a screen before jumping to the next thing. It describes our behavior inside a particular environment, one stuffed with tabs, apps and alerts. It is not evidence that the underlying machinery of concentration has broken. The capacity is still there; the conditions around it have gotten noisier.

Why interruptions are the real problem

A lot of the switching is self-inflicted. We reach for the phone, open a new tab or check a message, often before anything outside has actually interrupted us. Each switch carries a cost. The American Psychological Association notes that flipping between tasks can cut productivity by as much as 40%, because the brain has to reload the rules of the new task every single time. And the cost outlasts the interruption itself: in her University of California interview, Mark described how it can take over 20 minutes to get back to the original task once you have been knocked off it.

Your phone makes this harder even when you are not touching it. In a 2017 study led by Adrian Ward, people performed worse on attention tasks simply because their own smartphone was sitting on the desk. It did not matter whether the phone was switched on or off; its mere presence used up some of their available mental capacity. In other words, part of your focus is quietly spent on not checking the phone.

How to focus better

If the real culprit is your environment and your habits, then those are the things to change, not your "goldfish brain".

Single task on purpose. Pick one thing and let yourself do only that until it is finished or your time is up. Trying to juggle two demanding things at once is exactly what triggers the costly switching the APA describes.

Remove the interruptions before they arrive. Turn off non-essential notifications, and when you really need to concentrate, put your phone in another room rather than face down on the desk, since the Ward study shows presence alone is enough to cost you.

Work in short, protected blocks. Try a focus block of about 20 minutes on a single task, then take a real break. A clear finish line makes it easier to resist the urge to switch, and you can stretch the blocks out as focusing gets easier.

Protect your sleep. Attention is one of the first things to fail when you are short on rest. A 2025 review in Cureus reports that insufficient sleep impairs vigilance, leading to more attentional lapses and slower, less accurate responses. No focus technique survives a run of bad nights.

When to see a professional

Everyday distraction is normal and usually environmental. But there is a line worth watching. If your trouble focusing has been there for as long as you can remember, shows up across work, home and relationships, and genuinely interferes with your life, that is a different picture. The National Institute of Mental Health describes adult ADHD as a persistent pattern of inattention that is frequent, appears across multiple settings and interferes with daily life. If that sounds like you, it is worth asking a doctor or psychologist for a proper assessment instead of reaching for yet another productivity hack.

The honest takeaway

You are not a goldfish, and your attention span has not shrunk to eight seconds. What has changed is the world you are trying to focus in, and the habit of interrupting yourself inside it. The research points to an encouraging conclusion: fix the environment and the interruptions, work in protected blocks, and protect your sleep, and your focus has room to come back. The problem was never your brain.