In the above video, 75% of the people tested failed to notice that the person they were talking to was swapped with a different person during their conversation. In a similar experiment conducted by Derren Brown, about 50% of people failed to notice that a person asking them for directions was
We also experience some form of ‘blindness’ on a very small scale. Our brain performs something called Saccadic Masking during certain types of fast eye movements (saccades), where our vision is massively impaired during the movement, but our brain uses before and after snapshots to hide the fact that we were unable to clearly see during the movement – in effect, it is hiding the useless blurred image of movement from us.
You can see this in action with a simple experiment. Grab a friend and a mirror. Look into the mirror, and stare at one eye, then switch to the other, then back again. You won’t be able to see your eye movement (your brain is masking it), but your friend will.
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