10 Facts About Motion sickness

Motion sickness occurs due to a difference between actual and expected motion.

Motion sickness is caused by a conflict between signals arriving in the brain from the inner ear, which forms the base of the vestibular system, the sensory apparatus that deals with movement and balance, and which detects motion mechanically.

Air sickness is a kind of terrestrial motion sickness induced by certain sensations of air travel.

Seasickness is a form of terrestrial motion sickness characterized by a feeling of nausea and, in extreme cases, vertigo experienced after spending time on a boat.

Motion sickness arising from such situations has been referred to as "visually induced motion sickness" .

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Space motion sickness was effectively unknown during the earliest spaceflights because the very cramped conditions of the spacecraft allowed for only minimal bodily motion, especially head motion.

Space motion sickness seems to be aggravated by being able to freely move around, and so is more common in larger spacecraft.

Recent theory argues that the main reason motion sickness occurs is due to an imbalance in vestibular outputs favoring the semicircular canals vs otolith organs .

Behavioral measures to decrease motion sickness include holding the head still and lying on the back.

The rates of space motion sickness have been estimated at between forty and eighty percent of those who enter weightless orbit.