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In psychophysical perception, the Coriolis effect (also referred to as the Coriolis illusion) is the misperception of body orientation and induced nausea due to the Coriolis force. This effect comes about as the head is moved in contrary or similar motion with the body during the time of a spin, this rotation of the head affects the semicircular canals within the ear which causes a sense of dizziness or nausea before equilibrium is restored after head returns to a stabilized state.

History
Coriolis force was discovered by Gaspard-Gustave de Coriolis in 1832. By the end of the nineteenth century, Coriolis force has become a common phrase in meteorological literature. Coriolis force is classified as a fictitious force that is applied to objects that are in rotation. When applied to perception, this occurs when a persons head is moved out of alignment during a spin. If a person is spinning to the left along their y-axis and then push their head forward, that will bring their head out of alignment and make it subject to Coriolis force inducing the Coriolis effect. The manifestation of this effect is that the person will feel like their head is tilting to their left. This can cause nausea, disorientation, and motion sickness. These feelings of discomfort arise in the body when the signals being sent by the vestibular system and visual system are not in agreement, i.e. the eyes may be telling your body that you are not moving, but your vestibular systems fine-tuned senses are saying the opposite

Coriolis Effect in the Real World
The Coriolis effect is a concern for pilots, where it can cause extreme disorientation. This happens as pilots are accelerating their aircraft because they need to check their instruments which often involves moving their head. As pilots are looking up and down and from side to side this causes the Coriolis illusion. This is particularly dangerous for an airborne pilot because it give the feeling that they are pitching, yawing, and rolling simultaneously. In extreme situations, this can cause the pilot to lose control of the aircraft.