What the Noise Costs You
The noise you stopped noticing is still costing you. Here’s what it adds up to.
Cognitive Toll — Article 2 of 5. This is the second article in the Cognitive Toll series. The first (The Noise We No Longer Notice) explored the sheer volume of advertising and information competing for your attention every day, and why most people have stopped acknowledging the problem. This article is about what that weight is doing to you, whether you feel it or not.
The Tax on Every Decision
“The more decisions you make, the worse your decisions become.”
This is not a theory. It is measurable and true across many professions. Judges grant fewer paroles as the day goes on — not because later cases are weaker, but because deciding case after case wears down their ability to deliberate. Doctors prescribe unnecessary antibiotics later in their shifts — not because their training changes by 3 pm, but because it is easier to write the prescription than to explain why it is not needed. Financial analysts also become less accurate with each forecast they make in a day.
The pattern is the same everywhere researchers have looked: when people must make a long series of decisions, the later ones are worse. Not just a little worse. Measurably, predictably worse1.
Now consider what advertising does. Every advert is a small, uninvited demand on your mind: notice me, evaluate me, want me, dismiss me. You did not ask for any of them. You did not choose to engage with them. But your brain processes them all the same — because it does not distinguish between choices you made and those forced on you.
By the time you sit down to make a decision that actually matters — what to invest in or which opportunity to pursue — some of your capacity has already been spent on decisions that were never yours to begin with.
When Your Mind Is Full, It Plays It Safe
Apart from making odd decisions later in the day, Moshe Bar, a neuroscientist at Harvard, noticed how much of our inner life we miss when our minds are cluttered.
He and his student, Shira Baror, tested how thinking changes under different levels of mental load. What they found, published in Psychological Science in 20162, explains why.
When the mind is clear — truly free of clutter — thinking becomes more original. Not routine. Not predictable. Left alone, the brain makes unexpected connections, fresh associations, and ideas you would not reach by following the obvious path.
But when the mind is full — busy with noise, distractions, and everything it has absorbed, it retreats. It falls back on the safest, most familiar, least interesting connections it can find. Thinking becomes narrow and conventional. Not because you lack intelligence or creativity, but because the space where your best thinking happens is already taken.
This isn’t about being artistic. It’s about how well your mind connects ideas when you solve problems, read situations, or notice opportunities others miss. It’s about pattern recognition — a key skill for dealing with an uncertain future. Noise crowds out those patterns. It doesn’t stop you from thinking; it swaps your thinking for something cheaper.
The Business Model That Needs You Depleted
None of this is accidental. The attention economy — a term first used by Herbert Simon in 19713 — works like this: platforms capture your attention and sell it to advertisers.
The longer they keep you engaged, the more they earn. Notifications, autoplay, and algorithmically curated feeds are designed to hold your attention for as long as possible. It is the business model. However, most of the confusion for users comes from the battle between these businesses.
“With so many businesses fighting for your attention, it’s often hard to focus on anything. Everything becomes a blur and feels thoroughly overwhelming for most people. ”
More importantly, what kinds of decisions will you make at this point, and how do they connect back to the “attention economy”? Since most businesses can’t fully capture your attention because of competition, they compete for the next-best part of that economy: they know what to expect from an overwhelmed mind. They expect you to make a rash decision — like impulse buying.
A tired mind is easier to influence. When your decision-making capacity has been worn down by the noise, you become more impulsive. More likely to accept the default. More likely to choose what is put in front of you instead of what you actually need.
“When overwhelmed, you reach for what is familiar rather than what is best. You react rather than choose. You are easier to manipulate.”
That is not a side effect of the model. That is the model. The platforms are not neutral. The design is not innocent. And the cost is not measured in your attention alone — it is measured in the quality of every decision you make after the noise has had its way with you.
The Work Is Yours
Nobody is coming to lower the noise. The amount of content competing for your attention will keep growing. Where regulation exists, it focuses on data privacy rather than on protecting your ability to think clearly. No policy is being written to protect your capacity to recognise patterns or make decisions that reflect who you are rather than what the algorithm wants.
So the work is yours. You have to take back control. You have to learn to self-regulate — not because it is fair, but because no one else will do it for you. The good news is that it can be done. The next three articles in this series will show you how: how to recognise persuasion as it happens, how to resist it, and how to create the space where your best thinking lives.
You might want to read more in my book “What the Future Knows About the Past,” which was written for exactly this kind of fight.
Endnotes
Global Council for Behavioural Science. "The Cognitive Toll: Deconstructing Decision Fatigue and Its Pervasive Impact on Productivity and Morality." December 2025. https://gc-bs.org/articles/the-cognitive-toll-deconstructing-decision-fatigue-and-its-pervasive-impact-on-productivity-and-morality/
Baror, Shira, and Moshe Bar. "Associative Activation and Its Relation to Exploration and Exploitation in the Brain." Psychological Science 27, no. 6 (2016): 776–89. https://doi.org/10.1177/0956797616634487
Georgetown Law, Denny Center for Democratic Capitalism. "The Attention Economy and the Collapse of Cognitive Autonomy." July 2025. https://www.law.georgetown.edu/denny-center/blog/the-attention-economy/
