Which theory posits that motion sickness results from excessive stimulation of the vestibular system?

Which theory posits that motion sickness results from excessive stimulation of the vestibular system?

• A. Sensory Conflict/Neural Mismatch Theory
• B. Poison Theory
• C. Emesis Pathway Theory
• D. Vestibular Overstimulation Theory

Answer: (D)

Motion sickness can arise when the vestibular system is driven by movement more than the brain can comfortably handle. The vestibular overstimulation theory directly links symptoms to the amount of vestibular input, proposing that excessive stimulation of the vestibular apparatus (the parts in the inner ear that detect rotation and linear movement) triggers nausea, dizziness, and vomiting as the body's response to this overwhelming input. This emphasizes the intensity of vestibular signals as the key driver of the reaction. In contrast, sensory conflict or neural mismatch focuses on a mismatch between what you see and what your vestibular system senses, which is a related but distinct idea—it explains symptoms as a discordance between senses rather than simply the strength of vestibular stimulation. Poison theory and emesis pathway theory address different mechanisms not centered on vestibular input magnitude. So the option that directly ties motion sickness to excessive vestibular stimulation best fits the prompt.

Motion sickness can arise when the vestibular system is driven by movement more than the brain can comfortably handle. The vestibular overstimulation theory directly links symptoms to the amount of vestibular input, proposing that excessive stimulation of the vestibular apparatus (the parts in the inner ear that detect rotation and linear movement) triggers nausea, dizziness, and vomiting as the body's response to this overwhelming input. This emphasizes the intensity of vestibular signals as the key driver of the reaction.

In contrast, sensory conflict or neural mismatch focuses on a mismatch between what you see and what your vestibular system senses, which is a related but distinct idea—it explains symptoms as a discordance between senses rather than simply the strength of vestibular stimulation. Poison theory and emesis pathway theory address different mechanisms not centered on vestibular input magnitude. So the option that directly ties motion sickness to excessive vestibular stimulation best fits the prompt.