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Jeffrey D. Sharon, "The Great Balancing Act: An Insider's Guide to the Human Vestibular System" (Columbia UP, 2025)

October 21, 2025·1 hr 8 min·25 clips

Gregory McNabb introduces Jeffrey Sharon and his book, The Great Balancing Act, An Insider's Guide to the Human Vestibular System. The conversation takes up a system most people only notice when it fails. Sharon explains that balance is not a vague feeling but a set of bodily signals the brain has to sort out all the time. The interview keeps returning to the inner ear as a source of information about gravity and movement. It also treats the vestibular system as something with real clinical consequences, not just an abstract physiology topic. One thread concerns a discovery involving MRI machines and rhythmic eye movements known as nystagmus. Sharon describes how researchers noticed that normal humans can begin to show this eye twitching inside the scanner. That observation raised a simple but stubborn question: why does the effect happen at all? The discussion follows the work of David Z. and colleagues at Johns Hopkins as they investigated the problem further. They found that people without a vestibular system did not show the eye twitching, while people with one did. The interview then moves into a more mechanistic explanation involving the utricle. Sharon lays out the idea that an electrical field generated by the utricle may interact with the magnetic field of the MRI scanner. That interaction could create a force that produces the eye movement. The show handles the hypothesis carefully, with room for the experiments that support it and the mathematics used to make sense of it. Sharon also mentions later mouse experiments that helped strengthen confidence in the explanation. The result is a conversation that moves from a small observational oddity to a broader account of how scientists reason from evidence. McNabb's questions keep the exchange grounded in plain language without losing the technical substance. The book itself comes through as accessible and serious, built for readers who want a guided tour of a complex system. The episode also shows how a narrow subject can open onto larger questions about sensation, diagnosis, and the body's hidden machinery. Its strongest stretches are the ones where a concrete clinical or experimental detail does the real explanatory work. The overall tone is careful, patient, and quietly curious.

As heard by us

A steady look at the vestibular system and the way it keeps balance.

Jeffrey Sharon turns a specialized subject into something easy to follow. The discussion traces how the vestibular system helps the body stay upright, how the brain reads motion, and why ordinary dizziness can be worth studying.

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Why you'd press play

If you want the science behind balance, dizziness, and the inner ear, start here.

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