Simulation sickness

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Simulation sickness is a condition where a person exhibits symptoms similar to motion sickness caused by playing computer/video games. The cause is unknown, but many theories exist.

[edit] Vestibulo-ocular Reflex

One theory is that because the eyes are constantly moving to get a full perspective of the virtual world on the television screen, and the head isn't moving, this can confuse the nervous system. Those that believe this theory say that prolonged exposure can strain or possibly permanently damage the vestibulo-ocular reflex.

Here is an excellent research article done by the US Army: www.hqda.army.mil/ari/pdf/RR%201832.pdf

[edit] Symptoms

Some can range from headache,upset stomach, dihearia, and many others. The chance, based on a 2003 survey, is said to be about 5-7% of gamers. Most being on wide or large screen up close playing. In girls the chance of this is actually higher. A 12-14% chance.