What Happens To A Brain After 17 Days In Space? Not Much, New Device Finds

Astronauts’ Brains Showed No Major Decline After a Space Mission, and Wearable Tech Caught It All

When astronauts return from space, their bodies have been through a lot. Weeks of weightlessness, radiation exposure, isolation, and confinement aboard the International Space Station can place unusual stress on the body and mind. What happens to the brain during all of this, and how would anyone even know if something had gone wrong? A small new study suggests that a portable, lightweight brain monitoring device might be able to answer that question in just six minutes.

Researchers tested two astronauts who flew a 17 day mission to the International Space Station, measuring brain activity and cognitive task performance before launch, shortly after landing, and again five to six months later. Neither showed major drops in brain function. Just as notable is how researchers got there: using a wearable device the authors suggest could one day track brain health during future missions, potentially even in flight.

Stakes are high. As space agencies and private companies push toward longer missions, understanding how spaceflight changes the brain is no longer academic. It is a matter of crew safety.

A Brain Checkup That Fits in a Backpack

At the center of this study is a technology called brain vital signs, a framework that works similarly to how a doctor checks a patient’s pulse or blood pressure, except it measures brain activity instead. Using a wearable device that records electrical signals from the brain through sensors placed on the scalp, the system runs a six minute automated test. Participants listen to sounds and hear word pairs, and the device records how the brain responds.

Those brain responses act like a report card for how well certain mental functions are working: detecting a sudden sound, paying attention, and understanding language. The device used in this study, the NeuroCatch Platform, tracked three specific brain response signals tied to those functions, measuring both the size and timing of each response. It is a far cry from the bulky MRI machines most people picture in a hospital, which are expensive and impractical aboard a spacecraft.

Brain Vital Signs Testing Tracked Two Astronauts for Months

Research team collected data from two participants, identified only as P1 and P2 to protect privacy, who flew a 17 day Axiom Space mission to the International Space Station.

Each completed brain vital sign scans at three points: five to six weeks before launch, one to two weeks after landing, and five to six months after landing. Alongside those scans, participants completed the Cogstate battery, a standardized test covering memory, processing speed, decision making, working memory, and emotional recognition.

Results were largely stable. Changes between pre and post flight scores were minimal, and only one task showed a performance drop greater than 10 percent for one participant at any point. Brain activity scans told the same story: no significant differences in brain response signals between the pre flight and post flight measurements for either participant.

Authors are careful to frame this as an early stage, exploratory effort. With only two participants, it cannot draw broad conclusions about all astronauts. Researchers describe the findings, published in the journal Space: Science & Technology, as a demonstration that this kind of testing can work in this setting, rather than a definitive statement about spaceflight’s effects on the brain.

Brain Vital Signs Device Could Monitor Astronaut Health During Future Missions

Research linking brain activity measurements to spaceflight has been sparse. One previous study, examining astronauts over a six month mission, found signs of mental impairment immediately after landing, followed by a gradual return to normal. Post flight assessments in this new study, taken one to two weeks after landing, line up with that later recovery window, when measures had largely returned to pre flight levels. That timing may partly explain why no major deficits were detected.

Researchers also raise an honest caveat: the brain responses they measured were triggered by sounds and language, and spaceflight is known to affect other mental systems particularly hard, especially those tied to spatial awareness and balance. A test focused on those areas might tell a different story. Still, brain vital signs technology has already detected subtle changes in other high stakes settings, including concussion in ice hockey players, giving researchers confidence it is sensitive enough to catch meaningful shifts if they exist.

Authors call for future work with larger astronaut groups, same day baselines, and scans taken during spaceflight itself.

Three of the study’s five authors are employed by NeuroCatch Inc., the company that makes the device being tested, and one of them, Ryan C. N. D’Arcy, is its co-founder, president, and chief scientific officer. That is a conflict of interest readers should keep in mind. It does not invalidate the work, but it does mean independent replication will be especially worth watching for.

For now, the study tells us tools to monitor brain health in space are getting smaller and more practical, and that progress is worth watching.

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Disclaimer: This article is for general informational purposes only and does not constitute medical, neurological, or spaceflight health advice.

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