Guard your working memory: fewer tasks, ramp-up time, no multitasking
September 29, 2026 · 26 min read
Episodes on working memory, task switching, the prefrontal cortex and goal setting agree that attention is a narrow bottleneck: switching costs minutes of ramp-up and juggling goals degrades performance. Limiting daily priorities and building transition periods protects the brain's most valuable resource.
The rules, numbers and steps worth keeping in front of you.
- Working memory holds a little information briefly, then discards it. It is as much about forgetting as remembering.
- Huberman and D'Esposito: dopamine in the prefrontal cortex largely sets its capacity, on an inverted U.
- Raising dopamine helps people with low spans and can make people with high spans worse.
- Huberman's span test: recalling three to six sentence-ending words out of six is high, zero to two is low. It is not a diagnosis.
- Expect five to ten minutes of ramp-up before a new demanding task feels focused.
- Label a transition between tasks. Even 15 seconds helps if you name it.
- Match the gap to depth: a couple of minutes after light work, five to ten after deep focus.
- Keep the gap free of phone, texting, social media and new information. A hallway chat is fine.
- Write down at most three focus tasks a day. Routine activities do not count.
- Limit major goals to one to three a year, with concrete action steps checked weekly.
- Multitask only in the few minutes before focused work, never during it.
- Look at one point for 30 to 60 seconds before goal-directed work.
- D'Esposito: sleep deprivation, stress and aging hit the frontal lobes first.
- Talk to a healthcare provider before supplements such as L-tyrosine or any medication.
This is the short form. The full insight has every expert's reasoning, their own words and the sources.