We invest in smart people. But are we protecting their cognitive capacity.
I spend a great deal of my working week with leaders and teams. And one thing I am noticing more and more is just how cognitively overloaded people have become.
People are exhausted.
Calendars are packed.
Meetings run back-to-back.
People often move from one decision to the next, one Teams call to another, with barely enough time to process what was discussed before the next conversation begins.
And yet, somewhere along the way, we have started equating this level of activity with productivity.
The problem is that our brains do not.
What the neuroscience tells us
The prefrontal cortex is responsible for some of the thinking we most need from leaders – complex reasoning, judgement, planning, impulse control and considered decision-making. But it is highly sensitive to stress, fatigue and overload.
Working memory, our mental workspace for complex thinking, is also surprisingly limited. When it is overloaded with competing demands, interruptions, ambiguity and emotional noise, our ability to reason well starts to deteriorate.
We may still feel as though we are functioning effectively. We are still answering emails. Still attending meetings. Still making decisions. But activity and cognitive quality are not the same thing.
Under sustained cognitive load, we become more likely to rely on faster, more automatic thinking – assumptions, familiar patterns and mental shortcuts – precisely when the situation may require us to slow down, challenge our thinking and consider alternatives.
Think of cognitive capacity as the RAM in a computer. You can have an extraordinary processor – intelligence, experience, expertise and technical knowledge – but if the RAM is full, that processor cannot run complex applications effectively. Things slow down. Tasks get dropped. Errors creep in.
The capability has not disappeared. The capacity to access it has.
So how do we create better cognitive infrastructure around the people whose judgement we rely on? How do we do this for ourselves so we can do our best thinking, decision-making and problem solving?
Let’s explore five Key Steps to enable us to…
‘be the difference that makes the difference.’
Stop filling every available space.
An empty hour in somebody’s calendar is not necessarily unused capacity. Sometimes it is precisely where the thinking happens. If every gap becomes another meeting, we leave very little room for reflection, sense-making and the kind of thinking that connects one idea to another or solves a complex nuanced problem.
Why this matters? When external task demands reduce, the brain’s default mode network becomes more active. This network is involved in internally directed cognition, including memory integration, future thinking, sense-making and mind-wandering. Recent neuroscience also links wakeful rest and spontaneous thought with memory consolidation. In other words, a pause is not “nothing”. It can be where the brain integrates what has just happened and works out what it means.
Before filling the gap, ask: does this really need another meeting, or does this person need space to think?
Protect the decisions that matter.
Not every decision deserves the same cognitive energy. But important decisions deserve more than the final seven minutes of an overloaded meeting or the fifteenth judgement call of an already depleted day.
For important decisions, build in a reset: What information are we missing? What assumptions are we making? What would someone who disagreed with us say? Do we genuinely need to decide this now?
Why this matters? Cognitive fatigue changes the way the brain evaluates further effort. In 2025, Johns Hopkins researchers found that fatigue altered activity and connectivity involving the dorsolateral prefrontal cortex, which supports working memory, and the insula, which helps evaluate effort. As people became more fatigued, they were more likely to avoid additional cognitive effort. This is one reason why high-stakes decisions need deliberate pause points rather than being squeezed into whatever time remains.
Build cognitive infrastructure, not cognitive clutter.
One of the biggest drains on thinking is not the difficulty of the work itself. It is the amount of unnecessary mental traffic surrounding it – competing priorities, unclear ownership, constant switching and too many things being treated as equally urgent. The business case is simple. If decision quality matters to performance, then protecting the conditions in which good decisions are made is not a wellbeing extra. It is risk management. Design the system around the quality of thinking you need, rather than assuming smart people will somehow think well in any conditions because they don’t.
Why this matters? Cognitive load theory tells us that working memory has very limited capacity. Once that mental workspace is full, complex reasoning begins to fail, not because the person lacks capability but because there is nowhere left to hold and manipulate the information. This is where the idea of cognitive infrastructure becomes powerful: clearer priorities, structured decision processes, explicit pause points and better meeting architecture protect judgement rather than leaving it to compete with noise.
Break the back-to-back meeting habit.
We do not need every meeting to end at 10:00 and the next one to begin at 10:00. A 50-minute hour or a 25-minute half hour may be a much better investment in the next conversation. It’s not wasted time. It is transition time. It gives the brain a chance to come down from one demand before loading the next one.
Why this matters? Microsoft’s Human Factors Lab used EEG caps to compare four back-to-back virtual meetings with the same meetings separated by 10-minute breaks. Without breaks, beta-wave activity associated with stress accumulated across the sessions and spiked during the transitions between meetings. With breaks, beta activity dropped and the brain effectively reset. The no-break group also showed frontal alpha patterns associated with lower engagement, while those who paused were better able to stay engaged. The pattern is striking: the transition itself carries a significant cognitive cost.
Treat recovery as part of performance.
One of the great myths of modern work is that recovery sits outside performance. It does not. The brain cannot stay in sustained high-demand mode indefinitely and continue producing its best thinking and judgement. Protect lunch occasionally. Take the walk. Put a real gap after the difficult conversation. Block time for uninterrupted work. And stop assuming that the person who can tolerate the most back-to-back intensity is automatically the person performing at the highest level.
Why this matters to the brain: The prefrontal cortex is energy intensive and particularly vulnerable to prolonged stress. Under sustained pressure, stress chemistry shifts the brain towards faster, more reactive processing and away from the slower, more deliberate thinking we rely on for judgement, impulse control and long-term planning. Recovery is therefore not simply about feeling better. It is part of restoring the conditions for higher-quality cognition.
The question worth asking
We spend enormous amounts of money recruiting intelligent, capable people. Then we often bring them into working environments that make it increasingly difficult for them to access the very intelligence we hired them for.
Perhaps the question is not simply: How much are we getting done?
Perhaps it is: Are the conditions we are creating allowing our smartest people to do their smartest thinking?
Because protecting cognitive capacity is not soft management. It is risk management. It is protecting the quality of judgement, creativity and decision-making on which performance depends.
It’s a no brainer, we have to build cognitive infrastructure and take Key Steps to…
‘be the difference that makes the difference.’
