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He explains to me that when we’re searching for and categorising elements as targets in a first person shooter, we’re tracking multiple targets, and detecting motion of small objects. “For example, if you take the motion detection of small object, what is the optimal temporal frequency of an object that you can detect?”

And studies have found that the answer is between 7 and 13 Hz. After that, our sensitivity to movement drops significantly. “When you want to do visual search, or multiple visual tracking or just interpret motion direction, your brain will take only 13 images out of a second of continuous flow, so you will average the other images that are in between into one image.”

Discovered by researcher Rufin vanRullen in 2010, this literally happens in our brains: you can see a steady 13 Hz pulse of activity in an EEG, and it’s further supported by the observation that we can also experience the ‘wagon wheel effect’ you get when you photograph footage of a spinning spoked object. Played back, footage can appear to show the object rotating in the opposite direction. “The brain does the same thing,” says Chopin. “You can see this without a camera. Given all the studies, we’re seeing no difference between 20hz and above. Let’s go to 24hz, which is movie industry standard. But I don’t see any point going above that.”