Guide
Phone myths: eight claims about screens, checked.
Some statistics about phones are repeated so often that nobody checks them any more. We went back to the sources of eight of them.
In short. The goldfish attention span has no research behind it. The phone on the desk, blue-light glasses, night mode and the famous multitasking study all come out weaker than their headlines. A dopamine detox resets no brain chemistry. Quitting social media and the teen mental health crisis are genuinely debated. What holds up is plainer: notifications break concentration, and late-evening screens push sleep back.
Eight claims
| The claim | What the evidence says |
|---|---|
| “Our attention span is now shorter than a goldfish’s: eight seconds.” | No source. The BBC traced it to a 2015 Microsoft Canada report, which cited a statistics website, not a study. Attention depends on the task; an “average attention span” means little. |
| “Your phone just lying on the desk drains your brain.” | Weaker than claimed. One meta-analysis found a small effect on working memory only; another found none. The brain drain study. |
| “Blue-light glasses prevent eye strain.” | Not supported. A Cochrane review of 17 trials found they may make no difference to eye strain. Blue light glasses and night mode. |
| “Night mode fixes the phone’s effect on sleep.” | Not supported. In a trial, sleep was no better with it on. The trial. |
| “Heavy multitaskers are worse at switching tasks.” | Weaker than claimed. The 2009 finding did not hold up well in replications. Is multitasking a myth? |
| “A dopamine detox resets your brain.” | Not how dopamine works. It does not fall when you avoid stimulation; planned breaks are the useful part. Dopamine detox. |
| “Quitting social media makes you happier.” | Mixed. Cutting back helped in experiments; quitting completely shows no clear effect overall. Four experiments. |
| “Smartphones caused the teen mental health crisis.” | Contested. A best-selling book says yes; many researchers and a US National Academies report say the evidence does not show it. The Anxious Generation debate. |
What holds up
- Notifications break concentration. In an experiment, simply receiving one disrupted performance: what one buzz costs.
- Late screens push sleep back. In a sleep lab, reading on a light-emitting screen delayed sleep: your phone before bed.
- Every task switch costs time. The switching cost itself is well established: is multitasking a myth?
How to spot the next myth
- Trace it. Follow the citation back. If it ends at a website, a press release or nowhere, be wary.
- Count the people. A finding from 30 students is a start, not a fact.
- Ask about cause. “Goes with” is not “causes”: most phone research is surveys at one point in time.
- Look for the replication. Famous findings are often weaker the second time.
- Prefer the pooled view. A meta-analysis beats any single study.
All our research guides, each with its short answer: phone habits, what the research says.
Where we stand
We make Lychnos Ring, an AI ring in development, and we hold our own claims to the same standard: no health claims, and “in development” where it is. How we write: our rules.
Sources, read 4 November 2026: Simon Maybin, busting the attention span myth, BBC News, 10 March 2017; for the other claims, the sources listed on each linked guide. General information.
Questions
Is the human attention span shorter than a goldfish's?
No. The BBC traced the eight-second figure to a 2015 Microsoft Canada report, which took it from another website rather than from research. A psychologist told the BBC that an average attention span is a meaningless idea, because attention depends on the task.
How can I tell whether a statistic about phones is reliable?
Find where it first appeared, check how many people were studied and how, and look for later studies that repeated it. A single survey, or a figure with no traceable source, is a weak basis.