. Experts estimate that switching between tasks can cause a 40% loss in productivity. It can also cause you to introduce errors into whatever you’re working on, especially if one or more of your activities involves a lot of critical thinking.
A 2010 French study found that the human brain can handle two complicated tasks without too much trouble, because it has two lobes that can divide responsibility equally between the two. Add a third task, however, and it can overwhelm the frontal cortex and increase the number of mistakes you make.