Want to Actually Multitask? Science Says It Takes 4 Weeks of Focused Practice

A new Georgetown University study shows the human brain can physically rewire itself through practice to perform two tasks at once, challenging the long-standing idea that people only simulate multitasking by rapidly switching attention.

Researchers tracked participants over weeks as they practiced a car-sorting categorization task while doing a separate activity. Functional MRI scans revealed that, at first, the prefrontal cortex, the brain’s executive control center, handled the sorting task. After several weeks of training, that task migrated to the temporal cortex, a region linked to memory and object recognition. Once the categorization became handled outside the frontal lobe, the prefrontal cortex was free to focus on the second task, enabling true parallel processing.

Lead author Maximilian Riesenhuber said the shift effectively bypasses the brain’s frontal “bottleneck.” “Experience remodels the brain to bypass that frontal bottleneck. The prefrontal cortex then stays free for whatever else you want to do, increasing your capacity,” he explained.

Practice is essential, the team emphasized. The study found that the transfer from frontal to temporal areas took roughly four weeks and could not be accelerated. The more a task was offloaded from the prefrontal cortex, the better participants performed a second task in parallel, meaning real multitasking depends on sustained, focused practice rather than quick tricks.

The findings also interest AI researchers. The study grew from a Department of Defense-funded effort at Georgetown’s Center for Neuroengineering that uses neuroimaging to test models of how the brain builds on past learning without interference. Insights into reallocating functions to reduce bottlenecks could inform the design of more flexible, brain-inspired artificial intelligence systems.

Multitasking capability isn’t fixed. With weeks of dedicated practice, the brain can reorganize to run tasks in parallel, but there are no shortcuts.