Reaction Time Test Spacebar

How to take the reaction time test with the spacebar

Press Start test, then move your hand to the keyboard. The panel is red. After a random wait of about 1.5 to 5 seconds it turns green, and you press Space. Your time appears, and another press of Space starts the next try. Five tries are averaged into a score in milliseconds.

Pressing Space while the panel is still red cancels the try and it is repeated. The test accepts a click, a tap or the Space key on every try.

Why a key can be more consistent than a mouse

A mouse click asks one finger to press a small button while the rest of the hand holds the mouse still. If the hand shifts, the click changes. The spacebar is wide, fixed in place and hard to miss. Your hand rests on the desk and only one finger or thumb moves.

That does not make the keyboard faster in itself. It can make your tries more alike, and an average built from similar tries is easier to trust.

Finger placement

• Rest your thumb or index finger on the spacebar before the try starts, already touching it.
• Keep your wrist on the desk so the hand is supported.
• Use the same finger every time.
• Press once and let go. Holding the key down does not count as extra presses.

Keyboard latency

Every keyboard adds a small delay between the press and the moment the browser hears about it. Mouse, keyboard or touch input typically adds 1 to 20 ms, and a wireless keyboard is one more possible source of delay. A key also has to travel before it registers, so a finger that is already resting on it has less distance to cover.

Comparing spacebar and mouse scores

Run the test three times with Space and three times with the mouse on the same device, then compare the averages. If one is clearly lower, stick with that input. The mouse version is covered on the click reaction test page, and the reaction time tester page explains how the timer works.