A colored circle appears — press the correct key as fast as you can. Tests how quickly you process and respond to multiple choice stimuli. Based on Hick's Law: reaction time increases with the number of choices.
Very Easy
2 colors, 20 trials, 3s limit — F=Red, J=Blue
Easy
2 colors, 25 trials, 2.5s limit — F=Red, J=Blue
Medium
4 colors, 30 trials, 2s limit
Hard
4 colors, 35 trials, 1.5s limit
Expert
6 colors, 40 trials, 1.2s limit
Scientific Background
Based on: Choice Reaction Time — Hick's Law (Hick, 1952; Merkel, 1885) (Hick & undefined, 1952)