Multitasking reduces productivity by up to 40% — this claim is based on cognitive-science research often cited in Stanford-related studies and similar experiments on task-switching.
What research actually says
- The human brain cannot truly do multiple complex tasks at the same time.
- Instead, it rapidly switches between tasks, which creates a mental “switching cost.”
- Studies show that this switching can make workers:
- Up to 40% less productive
- Take about 50% more time to complete tasks
- Make more mistakes and miss important information
What Stanford-related research found
Research associated with Stanford showed that:
- Heavy multitaskers perform worse on memory and attention tests.
- They struggle to filter irrelevant information and focus on important tasks.
Why multitasking reduces productivity
- Switching cost: Each time you change tasks, your brain needs time to refocus.
- Reduced concentration: Divided attention lowers work quality.
- More errors: Mistakes increase when focus is split.
- Mental fatigue: Constant switching drains cognitive energy.
Simple conclusion
Multitasking may feel productive, but science shows it usually slows you down, increases mistakes, and can cut productivity by up to 40%.
