From the Oculus Rift headsets to the new HTC Vive, virtual-reality devices will soon be flooding the gaming market. Companies have long known that virtual-reality headsets, 3D movies and related types of technology can cause "cybersickness," which has symptoms similar to motion sickness. In the real world, a person processes input from multiple senses that are all in perfect agreement, said Mayank Mehta, a neuroscientist at UCLA who studies how VR affects the brains of rats. Perhaps the best-known virtual-reality product on the horizon is the Oculus Rift headset, made by Facebook-owned Oculus VR, a company based in Irvine, California.



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