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When you multitask, you tend to make more mistakes. When you toggle back and forth between tasks, the neural networks of your brain must backtrack to figure out where they left off and then reconfigure, Dr. Miller said. That extra activity causes you to slow down, and errors become more likely.

“People are much more efficient if they monotask,” he said.

Trying to multitask also impedes creativity, he said. Truly innovative thinking arises when we allow our brains to follow a logical path of associated thoughts and ideas, and this is more likely when we can focus on a single mental pathway for an extended period.


The brain is like a muscle: It becomes stronger with use, Dr. Miller said. As with physical exercise, the more we strengthen our mental connections by focusing on one task to the exclusion of all others, the better we can perform.

Via David Hain