Focus, deep thinking, and the truth about “IQ” claims
Does overstimulation make you less intelligent? The honest answer separates a real, measurable effect on focus from a much shakier claim about IQ.
It’s a popular headline: screens are lowering our intelligence. It’s also the kind of claim that deserves scrutiny, because “focus,” “analytical thinking,” and “IQ” are three very different things, and the evidence for each is different in strength. Let’s take them in order, from most to least established.
Focus: the clearest effect
The strongest finding is about available attention. In a well-known set of experiments by Adrian Ward and colleagues at UT Austin, nearly 800 participants took demanding cognitive tests with their smartphone either on the desk, in a bag, or in another room. Those whose phones were in another room significantly outperformed those with the phone on the desk — even though the phones were silent, and even though participants didn’t feel distracted.1
The researchers called it “brain drain.” The explanation is elegant: the effort of not attending to a tempting phone quietly consumes some of your limited cognitive resources, leaving fewer for the task in front of you.1 You don’t have to be using the device to pay a price for its presence.
The caveat that honesty requires
Now the part most articles skip. The “brain drain” finding is striking, but it has not always replicated cleanly. A meta-analysis gathering many follow-up studies found the effect to be real in some designs but inconsistent across the literature, with working memory appearing to be the domain most affected.2 The core idea — that constant device availability taxes attention — holds up reasonably well, but the size and reliability of the effect are still being worked out. That’s how science normally looks; be sceptical of anyone quoting a single dramatic number as settled fact.
Analytical thinking: plausible, and mechanism-backed
Deep analytical work depends on holding several things in mind at once and resisting distraction — exactly the resources that fragmented, high-stimulation environments tax. Reviews of media multitasking link it to weaker performance on tasks demanding cognitive control and, in some studies, on reasoning measures.3 The mechanism is intuitive: analytical thinking needs sustained, uninterrupted attention, and a mind trained to switch every few seconds is practising the opposite skill. This is a reasonable, evidence-supported concern — though, again, much of it is correlational.
IQ: handle with real caution
Here we have to be blunt, because this is where popular claims most often overreach. There is no good evidence that using screens permanently lowers your IQ. IQ is a relatively stable trait measure; the temporary dips seen in “brain drain” studies reflect available cognitive capacity in the moment — how much of your mind is free for a task right now — not a change in underlying intelligence. Confusing “I performed worse on this test while my phone sat nearby” with “my IQ dropped” is a category error.
Broader worries about population-level intelligence trends exist, but they’re contested and have many candidate explanations unrelated to screens. The responsible position: overstimulation can measurably reduce how much focus you have available, which affects performance — but “screens lower your IQ” is not something the current evidence supports.
What this means in practice
Strip away the hype and a useful, defensible picture remains. A constantly stimulated, device-saturated environment reliably eats into the attention you can bring to a task, and sustained focus is trainable like a muscle. That’s the honest promise behind a tool like DOPAM.: not a higher IQ, but deliberate practice at giving one thing your undivided attention — and, for the length of a session, putting the phone genuinely out of reach, which the “brain drain” research suggests is worth doing regardless.
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 — summarised by UT Austin News. https://news.utexas.edu/2017/06/26/the-mere-presence-of-your-smartphone-reduces-brain-power/
- Böttger, et al. Does the Brain Drain Effect Really Exist? A Meta-Analysis. PMC. https://pmc.ncbi.nlm.nih.gov/articles/PMC10525686/
- May, K. E., & Elder, A. D. (2018). A literature review of media multitasking in relation to academic performance. International Journal of Educational Technology in Higher Education. https://link.springer.com/article/10.1186/s41239-018-0096-z
This article is for general education and is not medical advice. Claims linking screen use to intelligence are frequently overstated; effects described here concern available attention and in-the-moment performance, not fixed intelligence.
Focus, deep thinking, and the truth about “IQ” claims
Does overstimulation make you less intelligent? The honest answer separates a real, measurable effect on focus from a much shakier claim about IQ.
It’s a popular headline: screens are lowering our intelligence. It’s also the kind of claim that deserves scrutiny, because “focus,” “analytical thinking,” and “IQ” are three very different things, and the evidence for each is different in strength. Let’s take them in order, from most to least established.
Focus: the clearest effect
The strongest finding is about available attention. In a well-known set of experiments by Adrian Ward and colleagues at UT Austin, nearly 800 participants took demanding cognitive tests with their smartphone either on the desk, in a bag, or in another room. Those whose phones were in another room significantly outperformed those with the phone on the desk — even though the phones were silent, and even though participants didn’t feel distracted.1
The researchers called it “brain drain.” The explanation is elegant: the effort of not attending to a tempting phone quietly consumes some of your limited cognitive resources, leaving fewer for the task in front of you.1 You don’t have to be using the device to pay a price for its presence.
The caveat that honesty requires
Now the part most articles skip. The “brain drain” finding is striking, but it has not always replicated cleanly. A meta-analysis gathering many follow-up studies found the effect to be real in some designs but inconsistent across the literature, with working memory appearing to be the domain most affected.2 The core idea — that constant device availability taxes attention — holds up reasonably well, but the size and reliability of the effect are still being worked out. That’s how science normally looks; be sceptical of anyone quoting a single dramatic number as settled fact.
Analytical thinking: plausible, and mechanism-backed
Deep analytical work depends on holding several things in mind at once and resisting distraction — exactly the resources that fragmented, high-stimulation environments tax. Reviews of media multitasking link it to weaker performance on tasks demanding cognitive control and, in some studies, on reasoning measures.3 The mechanism is intuitive: analytical thinking needs sustained, uninterrupted attention, and a mind trained to switch every few seconds is practising the opposite skill. This is a reasonable, evidence-supported concern — though, again, much of it is correlational.
IQ: handle with real caution
Here we have to be blunt, because this is where popular claims most often overreach. There is no good evidence that using screens permanently lowers your IQ. IQ is a relatively stable trait measure; the temporary dips seen in “brain drain” studies reflect available cognitive capacity in the moment — how much of your mind is free for a task right now — not a change in underlying intelligence. Confusing “I performed worse on this test while my phone sat nearby” with “my IQ dropped” is a category error.
Broader worries about population-level intelligence trends exist, but they’re contested and have many candidate explanations unrelated to screens. The responsible position: overstimulation can measurably reduce how much focus you have available, which affects performance — but “screens lower your IQ” is not something the current evidence supports.
What this means in practice
Strip away the hype and a useful, defensible picture remains. A constantly stimulated, device-saturated environment reliably eats into the attention you can bring to a task, and sustained focus is trainable like a muscle. That’s the honest promise behind a tool like DOPAM.: not a higher IQ, but deliberate practice at giving one thing your undivided attention — and, for the length of a session, putting the phone genuinely out of reach, which the “brain drain” research suggests is worth doing regardless.
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 — summarised by UT Austin News. https://news.utexas.edu/2017/06/26/the-mere-presence-of-your-smartphone-reduces-brain-power/
- Böttger, et al. Does the Brain Drain Effect Really Exist? A Meta-Analysis. PMC. https://pmc.ncbi.nlm.nih.gov/articles/PMC10525686/
- May, K. E., & Elder, A. D. (2018). A literature review of media multitasking in relation to academic performance. International Journal of Educational Technology in Higher Education. https://link.springer.com/article/10.1186/s41239-018-0096-z
This article is for general education and is not medical advice. Claims linking screen use to intelligence are frequently overstated; effects described here concern available attention and in-the-moment performance, not fixed intelligence.
