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The motion-to-photons latency in a VR headset is the amount of time it takes to update the display in response to a change in head orientation and position. For example, suppose the user is fixating on a stationary feature in the virtual world. As the head yaws to the right, the image of the feature on the display must immediately shift to the left. Otherwise, the feature will appear to move if the eyes remain fixated on it. This breaks the perception of stationarity.