Did you know you’re part of a vast cognitive experiment? One that tests the limits of your working memory every single day? With each ping, swipe and notification, knowledge workers—once valued for deep thinking and creative insight—increasingly function like short-term memory devices. The result? Fragmented thinking, reactive decision-making and rising cognitive fatigue. Knowledge workers use their brains as their primary tool—thinking, solving, learning and creating as core parts of their role. Their value comes not from what they produce with their hands, but from how they process information, make decisions, and generate insights.
Often working with complexity and autonomy, they rely on their ability to apply their expertise to solve problems and make sense of things that others find impenetrable. As they continue to adapt and grow their knowledge, they learn more. They’re paid to think—well, and deeply. So, why are we limiting their abilities to do exactly what we hired them for? And, more importantly, what can we do about it?
The Limits of Working Memory in the Modern Office
The brain can only hold a limited number of things in mind at any given time—according to research by Nelson Cowan, most people can hold only about four items in their working memory at once—and it simply isn’t designed to juggle long lists. When we try to focus on too many tasks, we overload our prefrontal cortex—the part of the brain we rely on for focus, decision-making, impulse control and creative thinking—when it matters most. This can lead to slower thinking, more mistakes and less clarity. This shows us that clearly defined, fewer priorities lead to better performance on both an individual and team/company level.
In the workplace, this shows up in countless ways: forgetting what was agreed in a meeting, rereading the same document multiple times, or starting a task only to be pulled away by another alert. These aren’t signs of laziness or incompetence—they’re the natural results of a system that isn’t fit for purpose. It’s common for otherwise capable, committed professionals to struggle to recall key details in meetings, leaving them flustered and unconfident. It isn’t a lack of effort, intelligence or an attitude failing or lack of will. Neuroscience helps us understand what’s happening: our working memory becomes less reliable under stress. Especially when we’re trying to multitask, or when the environment feels uncertain or unsafe.
Information Overload and the Myth of Multitasking
It’s tempting to believe we can keep up by doing more at once, but multitasking is a myth. Neuroscientific research shows we’re not truly doing multiple things simultaneously—we’re just switching rapidly between tasks, which taxes the prefrontal cortex and leads to what researcher Sophie Leroy called “attention residue.” Even minor distractions can have big consequences. A 2025 review found that mind-wandering increases during task performance over time, contributing to our growing inability to retain focus for sustained periods. What’s more, open-plan offices and always-on digital communications mean our brains are rarely allowed the quiet they need to consolidate information or generate creative insights.
Why “Memory Failure” Is Often a Design Problem
When professionals forget what was agreed upon or lose track of responsibilities, we tend to blame individuals. However, the issue often lies in how modern work is structured. Our environments are filled with distractions that hijack attention—our calendars are crammed with meetings, leaving little space for deep thinking, and the rapid-fire nature of the modern world rewards and encourages speed over depth or reflection. In truth, our brains weren’t built for this. The working memory system can be weakened not only by distraction but also by fear. Psychological safety isn’t just a cultural nice-to-have—it’s a biological prerequisite for cognitive performance.
Science-Backed Strategies to Retrain Your Brain
What can we do to reclaim our cognitive edge?
- Recognize the value of rest and recovery. Just as muscle recovery is key to physical performance, mental recovery is key to cognitive performance. A 2023 article in Neuroscience News emphasized how short rest periods help consolidate memories and restore motivation. Schedule space between tasks and meetings—even short pauses can give your brain time to reset.
- Reduce “ambient noise” in your workday. Whether it’s visual clutter, background noise or unstructured meetings, distractions deplete the finite resources of your prefrontal cortex. Design your environment to support focused work—consider time-blocking, noise-cancelling headphones or “deep work” zones.
- Engage in deliberate mental rehearsal. We now know that imagining a task can strengthen the same neural pathways as physically doing it. In a fascinating experiment by Guang Yue and Kelly Cole, participants who only imagined doing finger exercises increased their strength by 22 percent, similar to those who actually trained physically. This insight can be harnessed in preparing for presentations, remembering complex procedures, or even practicing difficult conversations.
- Make memory external. Use visual boards, checklists and project dashboards to not just track progress but also offload working memory. The brain wasn’t designed to hold all information; it was designed to process it. Externalizing memory frees up capacity for more strategic thinking.
- Cultivate insight through stillness. Neuroscientist Mark Jung-Beeman found that insight—the so-called “aha!” moment—arises when alpha brainwaves increase in the right occipital lobe. This happens most often when we’re quiet and relaxed. If you want to solve big problems, sometimes the best thing you can do is take a walk or stare out the window. This explains why people have some of their best ideas in the shower; we often do our best thinking when we’re not trying to cram more information in.
Rethinking Success in the Age of Mental Clutter
Technical skills alone aren’t enough anymore. To truly thrive, people need support in reshaping their days, habits, and workspaces in ways that align with how their brains naturally work. Leaders have a vital role to play in creating the conditions that make this possible by designing smarter systems, encouraging brain-friendly habits and modelling what good looks like. That means redefining productivity—not as the ability to churn through tasks, but as the ability to stay intentional, think deeply and bring insight to complex challenges. It means recognizing that memory is not just a personal trait—it’s a system-level outcome influenced by stress, culture and workplace design.
Leaders can continue pushing our people beyond the human brain’s cognitive capacities or redesign how we work so that memory, motivation and mental clarity aren’t constantly under siege. Those at the top of a corporate structure must make this choice. When we help our brains work better, everything else follows. The real opportunity lies in rethinking the systems we create and embedding wiser ways of working into everyday team life, so that performance, wellbeing and collaboration all have room to thrive.
Amy Brann is a neuroscience expert and founder of Synaptic Potential, a consultancy that helps organizations apply brain science to optimize performance and culture. She advises global clients on aligning business strategy with cognitive function and is the author of several books, including Make Your Brain Work (Kogan Page), out August 3rd, 2025.
