There are days when you sit down to work — in your office, at home, or in a meeting room — and everything seems “fine.”
Nothing serious happened.
You slept.
You’re not sick.
You don’t have an obvious crisis.
And yet… it’s hard to think.
You get distracted more easily.
You feel mentally heavy.
You postpone decisions — even simple tasks.
Or you make quick decisions that later don’t feel right.
This has to do with cognitive load. In previous episodes I’ve mentioned how cognitive load affects us, and today I want to go deeper into this, supported by scientific research.
What is cognitive load, really?
Simply put: cognitive load is the mental effort your brain must make just to function in an environment.
Your brain does not have infinite capacity.
It has a daily “budget” of attention, focus, and control.
When that budget is used for:
- thinking strategically
- creating
- analyzing
- deciding
Everything flows better.
But when that budget is spent on:
- orienting yourself in a confusing space
- ignoring noise
- filtering visual stimuli
- compensating for poor lighting or poor ventilation
- adapting to an environment that does not explain itself
- dealing with glare or reflections… etc.
Then you arrive mentally tired before you even begin to think.
That is cognitive load.
And many spaces are full of it.
This is the invisible tax no one explains to you.
Think about it this way: every space you inhabit charges you something.
Not always money.
Sometimes it charges you mental energy.
That charge does not arrive with a receipt.
It is deducted in small amounts:
- every time your attention is interrupted
- every time your brain has to “solve” the space
- every time something in your environment is unclear
That is what I call the mental tax of space.
And this is where science confirms something very important.
What happens in your mind when cognitive load is high?
Research from the Global Council for Behavioral Science, in the article “The Impact of Cognitive Load on Decision-Making Processes,” by Dr. Mai Saleh Quattash, explains something key:
When cognitive load increases, the mind does not fail randomly.
It fails in predictable ways.
And it affects fundamental things.
Damage #1: Attention
Your attention becomes narrow.
Under high cognitive load, your brain enters what psychology calls attentional narrowing.
In simple terms:
- you stop seeing the full picture
- you focus only on what is most obvious
- you lose sensitivity to secondary signals
Not because you are careless.
But because your system is overloaded.
Dr. Quattash explains that, in this state, the mind:
- reduces environmental sampling
- trades flexibility for rigidity
- and begins to operate in “tunnel mode.”
Operating in tunnel mode means you only see what is directly in front of you — as if you were looking through a small tube. You cannot see the sides. The sides become blind spots.
Now bring this back to space.
A place with:
- too many stimuli
- visual clutter
- poor hierarchy
- constant noise
pushes your brain to close rather than expand.
And when attention narrows, the quality of what you perceive decreases. Interesting, isn’t it?
Damage #2: You make decisions with incomplete information (without realizing it)
This is where it becomes delicate.
When your attention is limited, you do not analyze everything.
You analyze what stands out.
According to Dr. Quattash, research shows that under cognitive load:
- we anchor on what is most obvious
- we ignore less visible information
- we take mental shortcuts
She explains that this happens in:
- doctors under pressure
- pilots in complex situations
- financial analysts dealing with too much information
And let me tell you something — this also happens to leaders, executives, and professionals every day. I have experienced it myself.
Have you ever made a poor decision and only noticed it the next day?
Have you ever asked yourself, “Why did I decide that? What was I thinking?”
It has happened to me.
I remember one occasion when we were revisiting the design of a project. We realized some improvements were necessary, and I asked myself, “Where did that solution we proposed come from? What were we thinking?”
Now that I understand this topic, I can clearly identify what happened back then.
If you have experienced something similar, it is not that people decide poorly on purpose.
They decide with a reduced version of reality.
And space, when it is not designed for the activities it holds, contributes directly to that reduction.
Damage #3: Decision fatigue
As the day progresses, something else happens.
Your brain — specifically the prefrontal cortex — is responsible for:
- regulating impulses
- maintaining goals
- making deliberate decisions
But these functions are costly.
Dr. Quattash explains that sustained cognitive effort:
- reduces brain efficiency
- makes self-control more difficult
- and favors impulsive or avoidant decisions
This is what we know as decision fatigue.
Now consider this:
How many decisions do you make when you are already mentally drained — not because of the work itself, but because of the environment where you do it?
The common mistake: trying to compensate at the individual level
Most people try to solve this with:
- more discipline
- more coffee
- more productivity
- more hours
But science is clear: when the environment imposes too much cognitive load, the individual pays the price.
And it does not always appear as stress.
Sometimes it appears as:
- apathy
- lack of clarity
- irritability
- mediocre decisions
You see? The role of space — and why this truly connects to the mind — is important in your day.
A space thoughtfully designed for your activities:
- reduces friction
- organizes stimuli
- guides attention
- releases mental capacity
It does not demand more from you.
It returns resources to you.
That is why this is not a light topic.
It is a deep matter of thought quality.
That is why I say: creating a good space is not about impressing.
It is about protecting the mind of the person who inhabits it.
And when I say space, I am not only referring to a small room or area. This same principle applies when we design the entire structure — whether we call it a house or a building. It applies at every scale.
So consider this: does your space charge you a mental tax?
If at the end of the day:
- you are more tired than your work would justify
- you struggle to think clearly
- you make quick decisions but without conviction
The problem may not be you.
It may be the environment charging its tax.
This episode is supported by the article “The Impact of Cognitive Load on Decision-Making Processes,” published by the Global Council for Behavioral Science (GCBS), authored by Dr. Mai Saleh Quattash, dual Ph.D. in Philosophy & Psychology and Educational Psychology, with more than a decade of experience in cognitive assessments and decision-making processes.
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