By Sofia Pan, Grade 8
Your vision blurs. Your ears buzz. Then the horrible feeling of nausea swallows you, leaving your T-shirt soaked in cold sweat. Most of us have had the same experience—motion sickness. It’s so common that 1 in 3 people is affected, but few know what causes it or how it develops. If you’ve also been puzzled, here’s the answer.
Motion sickness happens when your eyes, inner ear, and body send conflicting messages to your brain. Take the vestibular system, located in the inner ear. It helps you stay steady and tracks every tilt and twist of your head. However, things go haywire when the motion it senses doesn’t match what the rest of your body expects. Picture yourself reading in a car: your inner ear knows you’re moving, but your eyes are locked on a still page. Trouble starts brewing.
Reconciling the mismatched information from your sensory organs overloads the brain. According to Treisman’s Toxin Theory, in nature, the only time your brain would experience such a massive, “exhausting” sensory conflict is if its neural pathways were being disrupted by a neurotoxin. As a result, this mismatch is interpreted as a sign that you have ingested poison. So the brain induces nausea and vomiting to protect your body—leaving you reaching for a window or a sick bag.
What if you’ve never experienced motion sickness? It’s not because you have special powers; instead, it comes down to neurological factors. Some people’s brains and bodies are simply wired to handle motion better—or worse—than others due to genetics,
neurotransmission (how your brain processes signals), age, and other factors. It’s all about how your particular nervous system responds to movement.
With a better understanding of motion sickness, you have a better chance of outsmarting it. Try fixing your focus on something steady, getting some fresh air, or having a natural remedy like ginger candy or tea. Take your time to discover the trick that works for you.
From the cause to the cure—that’s how science works. Before modern science, ancient Greeks attributed motion sickness to a disruption of bodily equilibrium, while ancient Chinese medicine blamed disturbances in the life force. Yet now you know that motion sickness is a condition that happens when your eyes, inner ear, and body send conflicting messages to your brain. With a little more curiosity—just like wondering why motion sickness occurs—you will not only discover an answer, but also uncover a solution.
