What parts of the brain are associated with multitasking or task switching?

The part of the brain that is associated with multi-tasking is the Prefrontal Cortex. This is near your forehead. That part of the brain does a lot of things. Some of them include multi-tasking, complex problem solving, conscience, moral emotions, self control, interacting socially, and etc. This part of the brain does so many things that even some scientists are studying to figure out why some people are psychopaths.