Measure speed perception, timing accuracy and visuomotor coordination
This rotary speed matching test shows two rotating discs. The left disc is the reference. The right disc changes speed. Press Match now when both discs appear to rotate at the same speed.
The main result is your average absolute speed error. A lower value means you reacted closer to the moment when the two discs had the same speed. Use your average across all rounds, not one lucky attempt.
It measures speed perception, visual comparison of moving stimuli, divided attention, timing accuracy and hand-eye coordination. The task is related to pursuit-tracking and anticipation-timing tests used in psychomotor research.
Driving requires judging changing speed, distance and timing while reacting with the hands. This browser test is not a legal driver psychotest, but it gives a practical sample of how consistently you can compare motion and act at the right moment.
Repeated practice may support cleaner visual attention, better timing control, and more stable response decisions under changing motion. For broader comparison, try Reaction Test Level 2, Flanker, and Symbol Digit Test.
Results can shift with screen refresh rate, browser timing, mouse/touch latency, fatigue, sleep, stress and visual focus. Compare results on the same device and browser. You can also read about sleep, stress and cognitive performance.
Rotary pursuit and pursuit-tracking tasks are commonly used to sample visual-motor coordination, while anticipation-timing tasks often use absolute error as a key measure. This online version adapts the idea into a browser-friendly speed-matching format.
For this online version, below 8 deg/s average error is strong, 8-16 deg/s is good, 16-28 deg/s is moderate, and above 28 deg/s means the match timing was inconsistent. These are practical in-site ranges, not medical norms.
The changing disc accelerates or slows through the reference speed. Your task is to catch the crossing point as closely as possible.
No. Professional assessments use standardized equipment, controlled conditions and examiner interpretation. This is only for training and self-tracking.
For a broader driving-style profile, combine this test with Reaction Time Test, Reaction Test Level 2, Poppelreuter Tables, and Flanker Test.
For training and self-tracking only; not a clinical, diagnostic or legal driving assessment.