Picking out a face in the crowd is a complicated task: Your brain has to retrieve the memory of the face you're seeking, then hold it in place while scanning the crowd, paying special attention to finding a match.
When you're jumping around from task to task, your brain has to stop, shift its focus, and start again.
Prioritize your day by focusing effort on the most important tasks while your brain is at peak operating power, usually at the beginning of the day.
These tasks help your brain create new neural pathways.
Or, they may just help you get through a mundane task; either way, your brain will like it.
Performing these tasks will help rewire your brain.
It doesn't matter if you got the task done; you allowed your brain to work faster than normal.
While we are able to channel simple electrical signals into and out of our body for sensor and effector functions, we don't know how to do so for more complex cognitive tasks: Where and how, within your brain, might a surgeon connect a chip's tentacles to communicate a concept like "freedom"?
When your brain is switching tasks, the cost is harder to quantify.
It's not easy for your brain to switch tasks.
