The vestibular system is composed of the semicircular ... For this reason, reflexive eye movements are often used as an objective, quantitative measure of vestibular sensation.

Even more than strength or mobility, recent research says you need to look to your balance to determine longevity.

Yet, it has long been a mystery why certain movements should make us feel ... but occurs in any animal that has a vestibular system – the delicate structure deep inside the ear responsible ...