What jitter clicking is
You tense the forearm until the hand starts to vibrate, and you let that vibration press the button. The finger itself barely moves. Done right it gives 10 to 14 clicks a second for a few seconds. Done wrong it is ordinary clicking with a sore arm.
Most click tests can't tell those two apart, because they only count. This one reads the gaps between clicks as well.
What the detector looks for
- Rate of 10 a second or more across the run. Below that, a fast single finger explains everything and there is no reason to call it jitter.
- Gap spread between roughly 10 and 40 percent. A vibrating arm is fast but never perfectly regular. The Gap spread box in your result is the standard deviation of the gaps divided by their average.
- No short-long-short-long pattern. That pattern comes from two fingers taking turns, which is butterfly clicking and gets its own label.
If more than 30 percent of your gaps are under 30 ms, the label changes to drag click or double-firing. No arm vibrates that fast. It means the finger is dragging across the button, or the mouse switch is worn and fires twice per press.
Why it might say no
- The run averaged under 10 CPS. Jitter that holds for two seconds and then collapses will average out as normal clicking over 10. Try the 5 second mode and look at the Second half box.
- You are on a trackpad or a touchscreen. The technique needs a mouse button with a light switch.
- Your gaps were very even. That usually means two fingers in good sync, which the detector calls Fast and even.
All of this is a heuristic. It can't see your hand, it sees a list of timestamps. If it gets your run wrong, I'd like to hear about it: [email protected].
Go easy on the arm
Jitter is sustained muscle tension and people do hurt themselves with it. Keep practice to short sets, shake the arm out between runs, and stop when you feel strain in the forearm or wrist. It is also rough on mouse switches, so maybe don't learn it on a mouse you love.