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The High Price of Multitasking Willingham, Daniel T . New York Times (Online) , New York: New York Times Company. Jul 14, 2019.

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ABSTRACT (ENGLISH) We all do it. The question is how. FULL TEXT html>

Not only do smartphones provide unprecedented access to information, they provide unprecedented opportunities

to multitask. Any activity can be accompanied by music, selfies or social media updates. Of course, some people

pick poor times to tweet or text, and lawmakers have stepped in. Forty-eight states have banned texting while

driving. In Honolulu, it’s illegal to text or even look at your phone while crossing the street, and in the Netherlands

they’ve banned texting while biking.

But legislation won’t proscribe all situations in which multitasking is unwise; you need to self-regulate.

Understanding how the brain multitasks and why we find multitasking so appealing will help you gauge the hazard

of pulling out your phone.

Multitasking feels like doing two things simultaneously, so it seems the danger lies in asking one mental process

to do two incompatible things — for texting drivers, watching the screen and the road. A lot of lawmakers must

think that way, because 20 states have instituted bans on driving using a hand-held phone while still allowing

hands-free calls. Yet hands-free or hand-held makes no difference — they impair driving equivalently as far as

external hazards go. Why?

You actually manipulate your phone only briefly for voice calls. The real problem is the toggling of attention

between the conversation and the road. Even simple tasks can’t be done simultaneously; you switch between

them, and that affects performance.

In a classic experiment, subjects viewed a digit-letter pair: for example, “C7.” A signal instructed people to classify

the letter as a vowel or nonvowel or the digit as odd or even. After the response, a new stimulus and a new signal

appeared. When the classification task switched, people responded about 20 percent slower than when it was

repeated, because switching requires extra steps: resetting your goal (“ignore digit, attend to letter”) and reloading

the mental rule (“judge it as vowel or consonant.”)

The cost of shuffling goals and mental rules is harmless if there’s predictable downtime during one or both tasks.

As a conference call turns to an agenda item irrelevant to you, go ahead and answer email. Multitasking while

driving is so dangerous because driving requires all of your attention at unpredictable times. People sense this,

and when on the phone they drive slower and increase their following distance, but they are far too confident that

these measures mitigate risk. Fifty-nine percent of adults, young and old, admit to using their phones while driving.

This overconfidence extends to other activities. A 2015 survey showed that a majority of students who use social

media, text or watch TV while studying think that they can still comprehend the material they’re studying.

This confidence is especially understandable for very simple tasks. Everyone knows texting behind the wheel is

dangerous, but listening to music or chatting with a passenger seems so undemanding as to be innocuous. Yet

both measurably compromise driving. If that’s surprising, consider whether you’ve ever turned down the radio or

shushed passengers when the road turned icy or when you were looking for an address.

Even walking, which feels like something we do on autopilot, is not immune. Experiments in virtual environments

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show that pedestrians are more likely to be hit by a vehicle when crossing the street if they are listening to music.

But people don’t multitask solely because they see no harm in it; they perceive benefits. They say they multitask

for efficiency, to fight boredom or to keep up with social media.

Music, likely the most common variety of multitasking, is added to tasks because it heightens arousal (for

example, your heart rate increases), making it easier to stick with a long drive or a tedious textbook. Music was

once common on factory assembly lines; the British Broadcasting Corporation offered a radio program for this

purpose, “Music While You Work,” from 1940 until 1967.

Thus, even if you fully appreciate the cognitive cost, you might tolerate it in exchange for the emotional lift.

Parents disapprove when their child studies with deadmau5 blasting because they compare that with studying in

silence. But the child calculates that without the music, he wouldn’t study.

This trade-off of cognition and emotion suggests a few principles to better manage your multitasking.

First, hoping for efficiency by combining two pure productivity tasks — say, composing a letter while following a

presentation — is folly. That’s all cognitive cost and no emotional benefit.

Second, be realistic about what poor task performance (when driving, for example, or operating machinery) might

mean, given that you’re not as good at multitasking as you believe. If you’re not ready to eliminate secondary

tasks, at least be ready to ditch them in the moment. I don’t expect music to disappear from cars, but consider

hitting mute if traffic gets dense or road conditions worsen.

Third, see if you can get the emotional lift without the cognitive cost. Instead of multitasking, take more rest

breaks, and get your social media fix during a break.

People will choose to multitask. But we should, at the very least, be fully aware of how that choice affects us and

the potential consequences for ourselves and others. We need to pay attention to how much — or how little — we

are paying attention.

Daniel T. Willingham (@DTWillingham) is a professor of psychology at the University of Virginia and the author,

most recently, of “The Reading Mind: A Cognitive Approach to Understanding How the Mind Reads.”

The Times is committed to publishing a diversity of letters to the editor. We’d like to hear what you think about this

or any of our articles. Here are some tips. And here’s our email: [email protected]

Follow The New York Times Opinion section on Facebook, Twitter (@NYTopinion) and Instagram.

Daniel T. Willingham is a professor of psychology at the University of Virginia and the author, most recently, of

“The Reading Mind: A Cognitive Approach to Understanding How the Mind Reads.” DETAILS

Subject: Social networks; Music; Multitasking; Text messaging

Location: Netherlands; New York

Company / organization: Name: New York Times Co; NAICS: 511110, 511120, 515112, 515120; Name:

University of Virginia; NAICS: 611310; Name: Twitter Inc; NAICS: 519130; Name:

Facebook Inc; NAICS: 518210, 519130; Name: British Broadcasting Corp; NAICS:

515120

Identifier / keyword: Text Messaging; Driver Distraction and Fatigue; Social Media; Traffic Accidents and

Safety; Brain

Publication title: New York Times (Online); New York

Publication year: 2019

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Publication date: Jul 14, 2019

Section: opinion

Publisher: New York Times Company

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Country of publication: United States, New York

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