Why Multi-Tasking is Killing Your Productivity & Increasing Your Stress
Multi-tasking (the ability to do more than one thing at a time) is an appealing and intuitive idea. The problem is that it’s not possible. Well, it’s mostly not possibly. Let me elaborate.
The truth is that you can
do more than one thing at a time. You can walk and chew gum, you can eat dinner while watching your favorite TV show, and you think about planning a lesson while doing laundry. But in each of those examples, only one of the things actually requires you to think, process, or comprehend something.
When we discuss the perils of multi-tasking, we are referring to those situations where we attempt to do more than one thing that requires attention, thinking, or cognitive processing.
Without going into great lengths about the role of attention and the brain, suffice it to say that you can only pay attention to one thing at a time. More specifically, you can only consciously process and focus on one thing at a time.
When we attempt to multi-task, what our brains really do is called task-switching. Since our brains can only consciously process one thing at a time, when we attempt to multi-task, what our brain actually does is switch between tasks or areas of focus. Some of us can do this task-switching very rapidly. So, you might say, “That sounds fine to me, what’s the problem?
” While some of us are adept at task-switching rapidly, there is always a cognitive loss or a “switch cost” as some researchers refer to it (Altman, 2017).
That “switch cost” ends up impacting our productivity and our stress levels. In the short run, it seems like we get more done but in the long run, what we get “done” ends up being less than our best.
Here is the real definition of multi-tasking: screwing up several things simultaneously.
Imagine this: you are grading papers while at the same time preparing dinner for your family. You might think you are multi-tasking when in reality you are switching (perhaps quickly) between two different things that require your attention. For example, you are in the middle of grading a paper when a timer goes off. You stop grading the paper and take the meal out of the oven. Since your attention has been split (albeit for a short period of time), when you go back to grading the paper, you will need to take a moment to remember where you left off. In essence, there is a loss of “flow” and an impact on short-term memory. When we do this often, the brain becomes fatigued and we make more mistakes. That's very stressful and frustrating.
If you need more convincing, a Stanford University study found that attempting to use electronic devices to multi-task negatively impacts memory (Uncapher & Wagner, 2018). And, other research suggests that there can be up to a 40% decrease in productivity when we attempt to rapidly switch between tasks that require attention and focus (Rubinstein et al., 2001).
But, can't multi-tasking make you more productive? That’s a tricky question. If by “productive” you mean to get lots of things done or checked off your to-do list, maybe. But, not everything that gets “done” is going to get done well. So, consider those tasks in front of you and think about those things that require your focus, attention, and thought. When something needs your complete attention and focus, put yourself in a situation where you can devote your attention to it – set aside the electronic devices, close out all the other programs running on your computer, and shut off other competing sensory inputs such as the radio and TV.
Bottom-line,
we are better off focusing on just one thing at a time. For efficiency and accuracy, avoid doing those things that split your attention. For a deeper dive into this phenomenon, read John Medina’s book Brain Rules (2014). In that book, he devotes an entire chapter to the role of attention in the brain, and he addresses the damage done when we attempt to multi-task.











