Do all humans have the same visual processing speed or does it differ from person to person? By ‘visual processing speed’, I mean the speed at which one takes to process visual information. For example, if a light has a frequency of 50 hertz where it switches on / off 50 times a second, do all humans have the same limit to how many hertz of the light switching on / off they can process? Another example is RPM of a spinning wheel where something is written on that wheel. Do all humans have the same maximum limit at the RPM in which they can process the written text at? Or something appearing in a computer screen in a specific time interval, such as miliseconds. Do all humans have the same limit in the smallest time interval they can all process the written data appearing in the screen at or does it differ?