Most of us did this experiment in school Science class. Using a 30cm ruler, one person holds it at the “30” mark and lets it hang down vertically. Their partner (person 2) puts the thumb and first finger of one hand at either side of the “0cm” mark on the ruler. Person 2’s fingers should almost touch the ruler, but not quite. Without warning, person 1 lets go of the ruler. Person 2 tries to stop the ruler’s descent as quickly as they can, by closing their finger and thumb together. You record the level (in cm), just above person 2’s finger, where the ruler was caught. You repeat the test five times and work out the average “catch distance” for the person. A conversion table allows you to translate the distance along the ruler into a reaction time, in milliseconds (thousandths of a second – i.e. one second is a thousand milliseconds). According to one such table, the first centimetre (“0cm – 1cm”) equates to 50 milliseconds. It then increases by 10 milliseconds per Continue Reading