The Autumn of the Multitaskers

To do two things at once is to do neither.
—Publilius Syrus, Roman slave, first century B.C.

It isn’t working, it never has worked, and though we’re still pushing and driving to make it work and puzzled as to why we haven’t stopped yet, which makes us think we may go on forever, the stoppage or slowdown is coming nonetheless, and when it does, we’ll be startled for a moment, and then we’ll acknowledge that, way down deep inside ourselves (a place that we almost forgot even existed), we always knew it couldn’t work.

The scientists know this too, and they think they know why. Through a variety of experiments, many using functional magnetic resonance imaging to measure brain activity, they’ve torn the mask off multitasking and revealed its true face, which is blank and pale and drawn.

Multitasking messes with the brain in several ways. At the most basic level, the mental balancing acts that it requires—the constant switching and pivoting—energize regions of the brain that specialize in visual processing and physical coordination and simultaneously appear to shortchange some of the higher areas related to memory and learning. We concentrate on the act of concentration at the expense of whatever it is that we’re supposed to be concentrating on.

What does this mean in practice? Consider a recent experiment at UCLA, where researchers asked a group of 20-somethings to sort index cards in two trials, once in silence and once while simultaneously listening for specific tones in a series of randomly presented sounds. The subjects’ brains coped with the additional task by shifting responsibility from the hippocampus—which stores and recalls information—to the striatum, which takes care of rote, repetitive activities. Thanks to this switch, the subjects managed to sort the cards just as well with the musical distraction—but they had a much harder time remembering what, exactly, they’d been sorting once the experiment was over.

Even worse, certain studies find that multitasking boosts the level of stress-related hormones such as cortisol and adrenaline and wears down our systems through biochemical friction, prematurely aging us. In the short term, the confusion, fatigue, and chaos merely hamper our ability to focus and analyze, but in the long term, they may cause it to atrophy.

The next generation, presumably, is the hardest-hit. They’re the ones way out there on the cutting edge of the multitasking revolution, texting and instant messaging each other while they download music to their iPod and update their Facebook page and complete a homework assignment and keep an eye on the episode of The Hills flickering on a nearby television. (A recent study from the Kaiser Family Foundation found that 53 percent of students in grades seven through 12 report consuming some other form of media while watching television; 58 percent multitask while reading; 62 percent while using the computer; and 63 percent while listening to music. “I get bored if it’s not all going at once,” said a 17-year-old quoted in the study.) They’re the ones whose still-maturing brains are being shaped to process information rather than understand or even remember it.

This is the great irony of multitasking—that its overall goal, getting more done in less time, turns out to be chimerical. In reality, multitasking slows our thinking. It forces us to chop competing tasks into pieces, set them in different piles, then hunt for the pile we’re interested in, pick up its pieces, review the rules for putting the pieces back together, and then attempt to do so, often quite awkwardly. (Fact, and one more reason the bubble will pop: A brain attempting to perform two tasks simultaneously will, because of all the back-and-forth stress, exhibit a substantial lag in information processing.)

Productive? Efficient? More like running up and down a beach repairing a row of sand castles as the tide comes rolling in and the rain comes pouring down. Multitasking, a definition: “The attempt by human beings to operate like computers, often done with the assistance of computers.” It begins by giving us more tasks to do, making each task harder to do, and dimming the mental powers required to do them. It finishes by making us forget exactly how on earth we did them (assuming we didn’t give up, or “multiquit”), which makes them harder to do again.

Neuroscience is confirming what we all suspect: Multitasking is dumbing us down and driving us crazy. One man’s odyssey through the nightmare of infinite connectivity.