the.com/carsickness

your eyes say still, your inner ear says moving, your stomach files a complaint

means The nausea, dizziness, and general queasiness some people feel while riding in a moving vehicle, caused by a mismatch between what the eyes see and what the inner ear senses.

from A plain compound of "car" plus "sickness," a modern descendant of the older "seasickness" — the same complaint, just landlubbed. "Sick" traces back to Old English "seoc," meaning ill or unwell, while "car" comes through Old French and ultimately Latin "carrus," a wheeled wagon (a cousin of "chariot" and "carry"). As automobiles spread, the queasiness once reserved for ships followed people onto the road, and the word simply swapped the vessel.

sensory feud
Brain panics at conflicting motion signals
poison theory
Body suspects hallucination, triggers vomiting to expel toxins
driver immunity
Drivers predict motion, so they rarely get sick
horizon cure
Looking far ahead realigns eyes with inner ear
age curve
Peaks around age nine, often fades by adulthood
for instance

motion sickness in vehicles — affects 1 in 3 people during car travel due to sensory conflict between eyes and inner ear

sea sickness on cruises — carnival cruise lines report 25-30% of passengers experience nausea in rough waters

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