A claim traveled across automotive media in late June and early July: driving a manual transmission gives your brain a workout that an automatic cannot, and it might even help hold off dementia. As someone who has argued for the third pedal for years, I wanted it to be true. So I went looking for the study behind it.
There isn’t one. Not a published paper, anyway.
Every English-language write-up traces back to a single article in a Japanese car magazine, quoting a single professor, with no journal named, no sample size given, and no method described. The professor turns out to be a revealing choice, and the real science sitting nearby says something more complicated than the headline.
Keep driving a manual because you enjoy it. Just do not tell yourself you are doing it to fight Alzheimer’s.
Key Takeaways
- No peer-reviewed study supports the viral claim. Every report traces to one article in the Japanese outlet Best Car Web, with no journal, sample size, or methodology disclosed.
- The quoted expert is Ryuta Kawashima, the Tohoku University neuroscientist behind Nintendo’s “Brain Age” games, whose broad brain-training claims failed the field’s largest replication tests.
- The closest real study measured active driving versus passive watching, not manual versus automatic. It used 11 people in a video-game simulator and never mentions transmissions.
- The safety literature complicates the story. Added mental load during driving often slows reaction time and degrades control, the opposite of a clean benefit.
- The take rate keeps falling. Manuals dropped from about 35 percent of new US cars in 1980 to under 1 percent by 2021, per EPA data.
- Where a manual is still offered, enthusiasts choose it. More than 80 percent of Porsche 911 and Subaru BRZ buyers pick the stick, even as the overall market abandons it.
- The real reason to buy one is joy, not neuroscience. And a few of the last manuals, including the BMW Z4 and manual Toyota GR Supra, end after 2026.
Where the Claim Actually Came From
Follow the citations backward and they collapse into a single point. The Autoblog, Carscoops, and CarExpert versions all rest on one piece from Best Car Web, an enthusiast magazine in Japan, frequently read in the West through machine translation. That article attributes three tidy points to Professor Ryuta Kawashima of Tohoku University’s Institute of Development, Aging, and Cancer. It offers no direct study, no journal, no number of participants, and no description of how anyone measured anything.
The one line that keeps getting quoted is a statement of mechanism, not a finding. Kawashima’s argument, in translation, runs like this: because a manual forces you to judge the situation and select the right gear, it loads the brain’s cognitive functions more than a passive automatic does.
That is a reasonable-sounding hypothesis. It is not data.
Nobody in the chain of coverage produced a single participant, a single scan, or a single controlled comparison of manual drivers against automatic drivers.
Strip away the headline verbs, the ones about a study “proving” that stick shifts “light up” a sleeping brain region, and what remains is a professor telling a car magazine that shifting gears probably engages your head more. Which, sure. The leap from there to dementia prevention is the entire problem.
The Professor Is the Tell
Ryuta Kawashima is not a neutral voice on whether mental exercise sharpens the aging brain. He is the neuroscientist whose name sold Nintendo’s “Brain Age,” the floating-head puzzle franchise that convinced millions that a few minutes of daily arithmetic would keep them sharp.
That commercial claim, that exercising the prefrontal cortex on a task delivers broad cognitive benefit, is precisely the claim that ran aground when researchers tested it at scale.
In 2010, a study in the journal Nature put more than 11,000 people through six weeks of brain-training exercises, including the kind Kawashima’s games popularized. Participants got better at the specific tasks they practiced and no better at anything else. The improvement did not transfer. A 2016 review of more than 100 brain-training studies reached the same conclusion: people improve at the trained activity, while evidence for wider gains to memory or reasoning stays thin.
This matters because the manual-transmission claim asks for the same leap that already failed. It is not enough that shifting engages your brain in the moment.
For the dementia angle to hold, that engagement has to transfer into general, lasting cognitive resilience. That specific jump, from a trained task to broad protection, is the one the science keeps declining to make, and it is being asked for here by the man whose career is built on it.
The Real Study People Keep Confusing It With
There is a genuine, recent, peer-reviewed driving study in circulation, and it is not the one the headlines think it is.
Published in Frontiers in Neuroscience in November 2025, a team from Institute of Science Tokyo and Tokyo Polytechnic University compared what the brain does when a person actively drives a simulator versus when the same person passively watches a replay of their own earlier drive. Active control lit up frontal-midline theta activity, a marker of engagement, far more than passive watching did.
Read carefully, that study says nothing about transmissions. Its comparison is driving yourself against watching a video, not a manual gearbox against an automatic one. It ran 11 participants through a racing game in a single session, and its own authors note the results generalized poorly across different people.
It is interesting work about the difference between doing and observing. It is not evidence that a clutch pedal protects your memory, and anyone citing a peer-reviewed Japanese study for the manual claim is probably pointing at this paper by mistake.
An earlier study, from the University of Nottingham in 2016, used brain imaging on 32 drivers and found that prefrontal activity rose with the mental workload of harder maneuvers like overtaking. Useful, and real. It also cuts against the simple story, because in that work the older, more experienced drivers showed more activation, which the authors tie to the lower crash risk of experienced drivers rather than to anything about a gearbox.
More Brain Load Is Not Automatically Good
The feel-good version skips a complication. Road-safety research spends a lot of effort documenting that added cognitive load during driving tends to make people worse at it, not better. Reviews of distraction and mental-workload studies find that piling extra demand on a driver slows reaction time, weakens vehicle control, and delays braking, regardless of what the extra demand happens to be.
So the same premise the manual claim celebrates, that a stick keeps your mind busier, is the premise the safety literature treats as a hazard when it comes from a phone conversation or a complex touchscreen.
Engagement is not a uniformly good thing to load onto a person piloting two tons at speed. Whether the specific, learned, rhythmic act of shifting gears helps or hurts is exactly the question a real study would need to isolate, and no such study exists yet.
There is also the plainest confounder of all. In 2026, the person who deliberately buys a manual is self-selected: often younger and more engaged, sometimes an older lifelong stick driver, almost always someone who cares. If manual drivers ever did score better on a cognitive test, untangling the gearbox from the kind of person who chooses it would take careful controls that a car-magazine paragraph does not provide.
The defensible version is narrower. Shifting your own gears demands more moment-to-moment attention than letting a torque converter handle it. That is real and probably good for engagement while you drive. It is not the same as a proven, lasting defense against cognitive decline, and it is not a substitute for sleep, exercise, and the other habits that genuinely move the needle. Treat “manuals are good for your brain” as a pleasant maybe, not a medical finding.
The Thing That Is Actually Worth Saving
None of this makes the manual less worth having. It just means the case for it is the one enthusiasts already knew: a stick is more involving, more rewarding, and increasingly rare.
You do not need a neuroscience alibi to justify enjoying your car.
The rarity is not a feeling, it is a measurement. By the EPA’s full-year accounting, manual transmissions slipped under 1 percent of US production in the 2021 model year and have stayed there. The market analyst JATO put it at 0.8 percent of new light vehicles in 2024, down from about 6 percent in 2010.
J.D. Power’s partial-year figure for 2023 ran higher at 1.7 percent, so the exact number depends on who is counting, but every source agrees on the direction and the smallness. In 1980, roughly 35 percent of new American cars came with three pedals.
The counterintuitive part is what happens when a manual is actually on the menu. Buyers who have the choice take it in numbers the broader market would never predict. When Motor1 surveyed automakers about their 2025 sales, the take rates for cars that still offer a stick came back looking like a different industry entirely.
| Model | Manual take rate (2025) |
|---|---|
| Subaru BRZ | 90% |
| Lotus Emira | 88% |
| Subaru WRX | 85% |
| Porsche 911 (overall) | 83% |
| Pagani Utopia | 75% |
| Toyota GR Corolla | 71% |
| Mazda MX-5 Miata | ~70% |
| Cadillac CT4-V Blackwing | 61% |
| Nissan Z | 46% |
| Acura Integra | 22% |
Ninety percent of Subaru BRZ buyers choose to row their own gears. So do more than eight in ten Porsche 911 customers.
The people who abandoned the manual were never the enthusiasts. They were the commuters, and once the commuters left, automakers stopped fitting clutches to the cars commuters buy.
If You Want One, the Clock Is a Better Reason Than the Brain
Around 25 models still offer a manual for the 2026 model year, depending on how you count, and the list shrinks most years.
The Mazda MX-5, Honda Civic Si and Type R, Subaru BRZ and WRX, Ford Mustang GT, Toyota GR86, Porsche 911 in Carrera T and GT3 form, and the Hyundai Elantra N all soldier on with three pedals. The Elantra N remains one of the most affordable ways into a new manual performance car.
A few are on their way out. The manual BMW Z4 ends after 2026, and Toyota is sending off the stick-shift GR Supra with a Final Edition. If you have wanted one of those specifically, the reason to move is the calendar, not a claim about your hippocampus.
Buy the manual because a good one makes an ordinary drive feel like something you chose to do, not something that happened to you. That has always been enough.
Bottom Line
The story that a manual transmission sharpens your brain and staves off dementia has no published study behind it, only a hypothesis from the neuroscientist whose broader version of that idea already failed replication. The real driving research nearby measures active engagement, not gearboxes, and the safety literature warns that extra mental load can cut both ways. So enjoy your clutch pedal for the reasons that hold up. It is engaging, it is disappearing, and a couple of the last examples run out after 2026. That is a better argument than junk neuroscience ever was.
Frequently Asked Questions
Is driving a manual transmission actually good for your brain?
There is no peer-reviewed study showing that a manual transmission improves brain health or prevents cognitive decline. Shifting your own gears does demand more moment-to-moment attention than an automatic, which likely raises engagement while you drive, but that is not the same as a proven, lasting cognitive benefit.
Where did the manual transmission brain claim come from?
Every version traces back to a single article in the Japanese car magazine Best Car Web, quoting neuroscientist Ryuta Kawashima of Tohoku University. That article named no journal, no sample size, and no methodology. It presented a hypothesis about mental engagement, not a documented study.
Who is Ryuta Kawashima?
Kawashima is the Japanese neuroscientist behind Nintendo’s “Brain Age” games. His broad claim that exercising the prefrontal cortex on a task yields general cognitive benefit is the same idea that failed large-scale replication tests, including a 2010 study in Nature of more than 11,000 people.
Is there any real study about driving and the brain?
Yes, but it does not compare transmissions. A November 2025 study in Frontiers in Neuroscience found that actively driving a simulator engages the brain more than passively watching a replay. It used 11 participants and never addressed manual versus automatic gearboxes.
Does a manual make you a safer driver?
The evidence is mixed and does not clearly support that claim. Road-safety research generally finds that added cognitive load slows reaction time and degrades vehicle control. Whether the specific act of shifting helps or hurts has not been isolated in a controlled study.
What percentage of new cars are manual?
By EPA data, manual transmissions fell below 1 percent of US production in the 2021 model year and have stayed there. JATO reported 0.8 percent of new light vehicles in 2024, down from about 6 percent in 2010. For comparison, roughly 35 percent of new US cars were manual in 1980.
Which cars still have a manual take rate above 80 percent?
Where a manual is offered, enthusiasts pick it. The Subaru BRZ ran about 90 percent manual in 2025, the Lotus Emira 88 percent, the Subaru WRX 85 percent, and the Porsche 911 lineup 83 percent overall. The commuters left the manual behind; the enthusiasts did not.
Which new cars can I still buy with a manual in 2026?
Around 25 models still offer one, including the Mazda MX-5 Miata, Honda Civic Si and Type R, Subaru BRZ and WRX, Ford Mustang GT, Toyota GR86, Porsche 911 Carrera T and GT3, and the Hyundai Elantra N. The manual BMW Z4 and the manual Toyota GR Supra both end after 2026.
Should I buy a manual for the health benefit?
No. Buy a manual because you enjoy driving one. The cognitive benefit is unproven, and it is no substitute for sleep, exercise, and other habits with real evidence behind them. The engagement and the rarity are reason enough.
Michael Kahn
Michael Kahn is the writer, photographer, and publisher behind The Weekly Driver. He cares about how cars drive and what they're like to own. He covers automobile industry news, car shows and events, and new car reviews. The reviews come from behind the wheel: day trips that favor back routes, treating a good meal as half the reason to go. He directs and produces the visual media, matching each car to a setting and mood that fit it. When he's not reviewing new cars, Michael races paddleboards, camels, and ostriches, along with the occasional exotic car on the racetrack, and has driven in every state and country visited.
https://theweeklydriver.com