Your phone on the table: what the brain drain studies found, and what the replications say
Does a phone on the table hurt focus and conversation? The original studies, the failed replications and two meta-analyses, in plain words.
Short answer
- a famous 2017 study found that simply having your own smartphone nearby reduced available cognitive capacity, even when people didn't touch it. A direct replication in 2022 did not find that effect.
- A 2023 meta-analysis of 22 studies found a small negative effect overall, clearest for memory.
- For conversations, a 2013 study found that a visible phone made talks between strangers feel less close, most clearly when the topic was meaningful.
Phones on the table are normal now: in meetings, at dinners, on the desk next to the laptop. Most people say they don't even look at them. The question is whether a phone that just lies there still takes something away. The research here is a good example of how science actually works: a striking first result, then repetition, then a more modest picture.
What is the brain drain effect?
The brain drain effect is the hypothesis that a smartphone you are not using still takes up part of your limited attention, simply by being close and relevant to you. You don't need to check it. Part of your mind is busy not checking it.
The original study (2017)
Adrian Ward, Kristen Duke, Ayelet Gneezy and Maarten Bos published "Brain Drain" in the Journal of the Association for Consumer Research in 2017. In two experiments, people's phones were placed either on the desk, in a pocket or bag, or in another room. Then participants did tasks that measure working memory and fluid intelligence.
The result: the mere presence of participants' own smartphone reduced available cognitive capacity, even when they successfully kept their attention on the task and didn't check the phone. The effect was strongest for people who depended most on their phones.
It was an elegant idea, and it spread quickly through articles, talks and company policies.
The replications
Then other researchers tried to repeat it.
Ruiz Pardo and Minda (2022), Acta Psychologica. They repeated Ward et al.'s second experiment with the same tasks and conditions. Their conclusion in the abstract was direct: the brain drain effect did not replicate. Where the phone was had no effect on performance in either task.
Böttger, Poschik and Zierer (2023), Behavioral Sciences. This meta-analysis pooled 22 studies with 43 effects on smartphone use and presence. It found a small overall negative effect (Hedges' g = −0.14). Broken down:
| Area | Effect | Significant? |
|---|---|---|
| Memory | g = −0.23 | yes |
| Attention | g = −0.07 | no |
| General cognitive performance | g = 0.10 | no |
| Overall | g = −0.14 | yes, small |
Source: Böttger, Poschik & Zierer, Behavioral Sciences 13(9), 2023. The overall figure combines phone use and phone presence.
The authors also found large differences between regions, which they could not fully explain, and noted that the number of studies is still small.
The brain drain effect is real enough to measure in some studies and small enough to disappear in others. A phone on the table is a small cost, not a catastrophe.
What about conversations?
Focus is one question. Connection is another, and here the evidence comes from a different line of research.
Andrew Przybylski and Netta Weinstein, then at the University of Essex, published two experiments in the Journal of Social and Personal Relationships in 2013. Pairs of strangers had a short conversation in a lab. In the first experiment, 74 participants were randomly assigned to a room where a plain mobile phone lay on a book on a nearby desk, outside their direct line of sight. In the other condition, a pocket notebook lay there instead.
In both experiments, the presence of the phone was linked to lower closeness, connection and conversation quality. The effect was clearest when people were discussing personally meaningful topics, not small talk.
That detail matters. A phone on the table may not change a status update meeting much. It may change the kind of conversation in which someone is about to say something real.
In experiments, a phone lying nearby made conversations between strangers feel less close, especially when the topic was personal.
The study has limits. The participants were young, about 22 on average. The phone wasn't their own. And it measured how people felt about the conversation, not what they said. It hasn't been tested with people who run companies.
What we know and what we don't
What we know
- The original brain drain study found a clear effect (Ward et al. 2017)
- Pooled evidence points to a small negative effect, clearest for memory (Böttger et al. 2023)
- A visible phone was linked to less closeness in meaningful conversations (Przybylski & Weinstein 2013)
What we don't know
- Why a direct replication found none (Ruiz Pardo & Minda 2022)
- Whether the effect is larger for heavy phone users in real work settings
- Whether the same holds for experienced leaders who know each other
Why an honest answer is more useful than a scary one
Many articles about phones and attention quote the 2017 study and stop there. We think the replications make the picture more interesting, not less. If the effect on pure cognition is small and uncertain, then the stronger reason to put a phone away may be the second one: what it does to the conversation in front of you.
There is also a simpler point that doesn't need a study. A phone on the table means you can be reached. For someone who runs a company, being reachable is part of the job. Being unreachable for a few hours has to be a decision.
A question worth asking
In your last important conversation, where was your phone, and where was the other person's?
No right answer. It is just interesting how rarely we notice.
Where Stilla Circle fits
At the Stilla Circle evenings we are preparing, phones stay in an envelope by the door, by choice, and anyone can take theirs back at any time. We don't claim this makes anyone smarter. The idea is simpler: for a few hours, nobody at the table can be reached, so the people there are the only ones in the conversation.
FAQ
Does having your phone nearby reduce your focus?
A 2017 study by Ward and colleagues found that the mere presence of your own smartphone reduced available cognitive capacity. A direct replication in 2022 did not find the effect, and a 2023 meta-analysis of 22 studies found a small overall negative effect, clearest for memory.
What is the brain drain effect?
The brain drain effect is the hypothesis that a smartphone you are not using still takes up part of your limited attention, simply by being close and relevant to you.
Did the brain drain study replicate?
Not cleanly. Ruiz Pardo and Minda (2022) repeated Ward et al.'s second experiment with the same tasks and found no difference between phone-location conditions. Meta-analyses disagree on the size of the effect.
Does a phone on the table affect conversations?
In two experiments, Przybylski and Weinstein (2013) found that a visible phone was linked to lower closeness, connection and conversation quality between strangers, most clearly during personally meaningful conversations.
Sources
- Ward, A. F., Duke, K., Gneezy, A., & Bos, M. W. (2017). Brain Drain: The Mere Presence of One's Own Smartphone Reduces Available Cognitive Capacity. Journal of the Association for Consumer Research, 2(2), 140–154. https://ideas.repec.org/a/ucp/jacres/doi10.1086-691462.html (accessed 16 Oct 2026)
- Ruiz Pardo, A. C., & Minda, J. P. (2022). Reexamining the "brain drain" effect: A replication of Ward et al. (2017). Acta Psychologica, 230. Record: https://forrt.org/flora-replication-atlas/doi/10.1086/691462/ (accessed 16 Oct 2026)
- Böttger, T., Poschik, M., & Zierer, K. (2023). Does the Brain Drain Effect Really Exist? A Meta-Analysis. Behavioral Sciences, 13(9), 751. https://pmc.ncbi.nlm.nih.gov/articles/PMC10525686/ (accessed 16 Oct 2026)
- Przybylski, A. K., & Weinstein, N. (2013). Can you connect with me now? How the presence of mobile communication technology influences face-to-face conversation quality. Journal of Social and Personal Relationships, 30(3), 237–246. https://doi.org/10.1177/0265407512453827 (accessed 16 Oct 2026)