Our brain can process and identify images that the eye sees for as little as 13 milliseconds. That's much faster than the 100 milliseconds suggested by previous studies. This rapid-fire processing helps us direct our eyes — which can shift gaze three times per second — to the next visual target.
Given how slowly our brains react to incoming visual information, it should actually be impossible for us to hit a blistering fastball. But we can. That's because, instead of showing us the world as it really is, our brains offer us a glimpse of the future.
This Sensory Substitution Device uses the camera to gather visual data and then uses a rather nifty computer algorithm to translates this data into sound. With a little practice, blind users can identify complex objects, and even read words.
Not everyone reacts to optical illusions equally: some are completely fooled by them, while others just can't see what all the fuss is about. It depends on the size of your visual cortex...and that can determine how introspective you are.