03/06/2026
Your brain is not multitasking. It is switching rapidly between tasks, and every switch has a cost.
Each time you shift from one thing to another, your brain has to disengage, reorient, and reload a completely different set of goals into working memory. Research shows this process alone can account for up to 40 per cent of lost productive time across a day.
And when you move on from a task, part of your brain does not. Psychologist Sophie Leroy calls this attention residue. It lingers in the background, adds to your cognitive load, and fragments your focus even in moments that feel quiet.
The more you switch, the more your brain gets rewarded for switching. Dopamine responds to novelty, and over time sustained focus starts to feel effortful while distraction starts to feel normal.
The good news is that even small changes help. Longer blocks of uninterrupted time, batching similar tasks, writing down open loops so your brain does not have to carry them.
Protecting your attention is not about doing less. It is about spending less energy on transitions and more on the work itself.