What is the main difference between AR and VR?
AnswerAR adds digital content to the real world; VR replaces it
AR keeps the real world in view and adds to it, while VR surrounds you with a virtual scene.
Tech · Facts & stats
Reality facts & stats
7 fact-checked facts about virtual reality and perception, each with the reason behind it. 5 more are in today's round and join this page after it closes.
The basics
What is 'haptic' feedback?
AnswerFeedback you feel through touch or vibration
Haptics uses vibration, force or motion to create a sense of touch.
Going deeper
VR motion sickness is mainly caused by a mismatch between vision and which sense?
AnswerBalance, sensed by the inner ear
When the eyes see motion but the inner ear senses none, the conflict can cause nausea.
In VR tracking, what does '6DoF' stand for?
AnswerSix degrees of freedom
6DoF tracking follows both where your head is and which way it is turned.
Each human eye has a 'blind spot' where...
AnswerThe optic nerve leaves the retina
There are no light-sensing cells where the optic nerve exits, so that spot sees nothing.
Expert level
What was the Sensorama, built in the early 1960s?
AnswerAn early immersive booth with 3D film, sound, smells and wind
Morton Heilig's Sensorama engaged several senses at once and is seen as a forerunner of VR.
What happens in the Müller-Lyer illusion?
AnswerEqual lines look different lengths because of arrow-shaped ends
Lines ending in outward fins look longer than identical lines ending in inward arrowheads.
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