Respond to the arrow fast. Hold back when the stop signal comes.
This task records stop-signal rt on a fixed, repeatable version of the task. Your result is comparable to your own previous attempts on the same device.
It does not diagnose anything, and it does not claim to improve anything beyond performance on this task. Reported times include display and input latency from your own hardware.
Stop if you feel dizzy, nauseous or strained.
An arrow points one way: press that arrow key (or tap that side). Sometimes a stop signal follows just after. Then do nothing. Don't wait for it: respond as fast as you can every time. Missing some stops is expected.
Stop-signal reaction time (how fast you can cancel a response). Lower is better. Each difficulty (Easy, Normal, Hard) keeps its own personal best, and custom settings are saved but not ranked, so your bests stay comparable.
Stop-signal reaction time is estimated, not measured directly: it is your arrow speed at the matching percentile minus the average stop delay. It needs at least 8 stop trials and fast, accurate arrow responses to mean anything. Not medical advice.
A reaction time is several things added together: seeing the change, deciding what to do, and moving. On a computer it also includes your screen and mouse or touchscreen, which add roughly 10 to 50 milliseconds depending on the device.
More choices take longer (Hick's law), and holding back a response has its own timing. We use the median of several trials and ignore anticipations under 100 ms, because those are guesses.
