Assess your visual recognition latency and cognitive choice selection. Press keyboard hotkeys **R**, **G**, **B**, or **Y** as colors appear. Precision is critical: incorrect selections add a **+150ms penalty**.
Press the matching color pad or press keys **R**, **G**, **B**, **Y** on your keyboard when the center box flashes. Incorrect choices carry a **+150ms penalty**!
Click card to startUnlike simple reaction tests where you react to any stimulus change, a **choice reaction test** introduces multiple distinct stimuli, each requiring a unique response. This test introduces four colored targets (Red, Green, Blue, Yellow), demanding that you identify the color, select the appropriate response key or pad, and execute the motor trigger.
In cognitive psychology, **Hick's Law** states that the time it takes to make a decision increases logarithmically with the number of options ($n$) available. The mathematical model is expressed as:
RT = a + b · log₂(n) Where **RT** is the reaction time, **a** is the total non-decision latency (such as optical transmission speed), **b** is an empirical constant, and **n** is the number of options.
By expanding the test from a single stimulus (simple reaction) to four choices ($n = 4$), your brain must engage executive sorting centers in the prefrontal cortex. This decision processing loop typically adds **150 to 220 milliseconds** of cognitive lag, pushing normal averages up to **380ms to 480ms**.
When people try to react as fast as possible, their error rates naturally spike. This is known as the **speed-accuracy trade-off**.
To prevent users from gaming the test by randomly spamming keys, our assessment implements a **+150ms penalty** for every incorrect choice. This forces your brain to balance rapid motor release with visual verification, providing a much truer assessment of executive function than speed alone.
Choice reaction is the baseline for almost all real-world activities. In driving, a simple reaction is slamming the brakes when a red light appears. A choice reaction is deciding whether to swerve left, swerve right, or brake when an obstacle appears in your lane.
We map inputs to the first letter of each color: **R**ed, **G**reen, **B**lue, and **Y**ellow. This semantic mapping creates a minor cognitive association pathway that you must master to achieve elite reaction scores.