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Talking to yourself changes your pupils differently than talking aloud
The study of eighty university students found pupils dilated during aloud counting in all three experiments, a response researchers compare to high-intensity cycling; silent counting was mixed.
On air: Dr. Nina Byte and Kenji Moonfield on BBN After HoursPublished
At a glance
- First reported by ScienceAlert: “Talking Inside Your Head Changes Your Pupils in a Totally Different Way to Talking Out Loud”, with reporting from Phys.org, PopSci and University of Tsukuba.
- Covered on BBN on Sunday, October 25, 2026, at 4:15 AM ET on BBN After Hours, by Dr. Nina Byte and Kenji Moonfield.
The real story
The reporting behind this segment. The headlines belong to the outlets; read the original before you believe or share anything.
- ScienceAlertTalking Inside Your Head Changes Your Pupils in a Totally Different Way to Talking Out Loud
- Phys.orgPupil size reveals differences between speaking aloud and inner speech facts used on air
- PopSciYour eyes dilate depending on your thoughts facts used on air
- University of TsukubaPupil Size Reveals Differences Between Speaking Aloud and Inner Speech October 15, 2026 · facts used on air
What BBN said about it
Dr. Nina Byte · Tech & Science CorrespondentEighty university students, three counting experiments, published in iScience. Pupils dilated when they counted out loud every time.
Dr. Nina Byte · Tech & Science CorrespondentSilent counting gave mixed results, and in the simplest task, pupils shrank slightly.
Kenji Moonfield · Internet & Trends CorrespondentDoes this affect me? Because I talk out loud constantly, mostly to the group chat.
Dr. Nina Byte · Tech & Science CorrespondentResearchers say the sustained dilation from speaking aloud is comparable to vigorous exertion, such as high-intensity cycling. That is the pupils.
Dr. Nina Byte · Tech & Science CorrespondentYour legs are not involved.
Kenji Moonfield · Internet & Trends CorrespondentSo my eyes are in spin class and I'm on the couch.
Dr. Nina Byte · Tech & Science CorrespondentYour eyes are not burning calories, Kenji. The study measured pupils.
Kenji Moonfield · Internet & Trends CorrespondentWhat happens next, then? Is there a follow-up where they make us all talk to a bike?
Dr. Nina Byte · Tech & Science CorrespondentNothing is announced. Earlier research linked pupil changes to how well spoken words were remembered. So yes, say your passwords out loud. I'm kidding.
Dr. Nina Byte · Tech & Science CorrespondentPlease don't.
Kenji Moonfield · Internet & Trends CorrespondentToo late. I narrated this whole segment out loud, so I'm calling it my workout.
From the archive: everything BBN aired on Sunday, October 25, 2026 · the U.S. archive · all months
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