Sixteen percentile points. That is the size of the average GRE reading-comprehension gain a group of undergraduates posted after two weeks, in a study run by researchers at UC Santa Barbara.
Not a year of tutoring. Two weeks of mindfulness class.
My first reaction was the same one you are probably having, so let me get the skepticism out in the open before I try to talk you back into taking it seriously.
A quick note before going further: I’m a writer, not a psychologist or any kind of clinician, and this is me reading and reflecting on one piece of research, not handing out advice. What follows leans heavily on a single 2013 study of 48 students, so treat it as a striking finding from a particular group of people, not a settled rule about how every mind works.
The instinct to dismiss it
Two weeks is nothing. We have all signed up for a habit that was going to change everything and quietly let it die by the end of the month. Mindfulness in particular has a reputation problem, partly earned: it gets sold as a cure for everything, which usually means it is a reliable cure for nothing.
I am not a natural ally here. I have tried meditating more than once and it never stuck. My wife, by contrast, has a real practice and meditates regularly, so I have watched up close what it looks like when it does work, and it still didn’t take with me.
My own quieter equivalent is a long walk alone, or playing a round of golf by myself, which is about as close to meditative as I get. So when I read that a fortnight of formal training moved a test score, my honest instinct was to assume the study was small, sloppy, or overstated.
What the UCSB study actually found
The 2013 paper, led by graduate student Michael Mrazek in Jonathan Schooler’s lab was published in Psychological Science. The researchers randomly assigned 48 undergraduates to either a two-week mindfulness course or a two-week nutrition course, both taught by experienced instructors. Before and after, the students sat a modified verbal-reasoning GRE section (with vocabulary items excluded, so effectively a reading-comprehension test) and a working-memory test, with their mind-wandering measured during both.
The mindfulness group improved on the GRE and on working memory, and reported mind-wandering less. The nutrition group showed none of those changes. The researchers estimated the reading-comprehension gain was equivalent to roughly 16 percentile points, and the improvement was statistically driven by reduced mind-wandering, particularly among the students most prone to drifting off at the start.
Mrazek was unusually guarded about his own result. He noted that “even with a rigorous design and effective training program, it wouldn’t be unusual to find mixed results.” And yet, he reported, “we found reduced mind-wandering in every way we measured it and improved performance on both reading comprehension and working memory capacity.”
Why mind-wandering is the mechanism worth understanding
The part that made the study click for me had nothing really to do with meditation as a concept. The course did not make anyone smarter in some vague sense.
The effect seems to have gone through a specific channel: less mind-wandering. The students stopped leaving the task. When their attention stayed in the room, more of it was available for the actual work.
I know too much about mind wandering personally. It is a problem that can cost me whole days. I sit down with a clear plan, start researching, never quite land the angle, drift into messages, then a YouTube tab, then a different tab, and look up to find the afternoon gone with nothing finished.
The thing it has in common with the lab is precise: attention slipping off the thing I meant to be doing.
It is also more common than most of us admit. A 2010 study by Harvard psychologists Matthew Killingsworth and Daniel Gilbert sampled people in real time and found we spend almost 47 percent of our waking hours thinking about something other than what we are doing. Their memorable line was that “a human mind is a wandering mind, and a wandering mind is an unhappy mind,” though that is a generalization drawn from correlational data, not a law. The number is the useful part. Roughly half the time, we are somewhere else.
What this does and doesn’t mean for you
What it does not mean: that a fortnight of breathing exercises will reliably add 16 percentile points to anyone’s test score. This is one study, with a small sample.
What it might mean is more interesting. The plausible active ingredient is not the incense-and-cushions image of meditation that put me off. It is the trainable skill of noticing when your attention has left and bringing it back. You do not have to believe in mindfulness as a worldview to find that worth a look. I never managed the formal version, and I still got a version of the benefit from a structural fix instead. The point might be the attention, not the method.
If any of this is less interesting than it is personal, if focus has slipped into something that feels more like distress than a productivity quirk, a qualified counsellor or therapist is a far better place to take it than any article.
