80ms/30 meters rule. Human brain is compensating for the audio/video discrepancy up to ~that number. http://blogs.scientificamerican.com/observations/2011/09/1

80ms/30 meters rule. Human brain is compensating for the audio/video discrepancy up to ~that number. http://blogs.scientificamerican.com/observations/2011/09/15/time-on-the-brain-how-you-are-always-living-in-the-past-and-other-quirks-of-perception/ http://blogs.scientificamerican.com/observations/2011/09/15/... tldr: Brain is inherently parallel, nothing happens in sync. In order to make sense of the outside world higher level functions are presented with artificially coordinated stimuli.