Reflex Test

Click the moment the screen changes from red to green! You can choose between 3 or 5 attempts, and your result is the average reaction time in milliseconds. Clicking before the screen turns green counts as an early click and won't be recorded, so stay patient. Neuroscientifically, this task measures Simple Reaction Time (SRT) — the signal transmission from visual cortex detecting the color change to the motor cortex. More attempts produce a more reliable average.

Keep your eyes fixed on the center and focus only on the color change. Rest your finger on the mouse button to react faster. Under 200ms puts you in the top tier, and below 150ms is legendary! In cognitive psychology, this is called "Preparatory Set" — pre-tensing your muscles in anticipation of the stimulus can save 20-40ms in the motor response phase. However, excessive tension increases early clicks, so maintaining optimal arousal level is key.

The reflex test is a classic brain training exercise that measures your response time to visual stimuli. Regular practice can improve your focus and quick reflexes, which also helps in FPS gaming and sports. Neuroscience research shows that repeated reaction speed training promotes myelination between visual and motor cortices, enhancing neural transmission efficiency. Studies report an average 15-25ms improvement after 4 weeks of daily 5-minute training, which also meaningfully contributes to better emergency response while driving.

It measures Simple Reaction Time (SRT) — the time from detecting a visual stimulus to executing a motor response. This reflects your neural transmission speed and information processing ability. The average adult visual reaction time is about 200-300ms, influenced by age, sleep quality, and caffeine intake. SRT is the most fundamental cognitive function metric in neuroscience, representing the combined efficiency of a 4-stage neural pathway: visual cortex, prefrontal decision area, primary motor cortex (M1), and finger muscles — all captured in a single number.

The average range is typically 200-300ms. Under 200ms is considered fast, and under 150ms is pro gamer level. Over 300ms might indicate distraction or fatigue. With daily practice, you can typically see improvement of about 10-20ms in your average scores. Interestingly, reaction time varies throughout the day — it's generally fastest between 10 AM and noon, and 20-50ms slower in early morning or late night. Try challenging yourself at different times to discover your peak performance window.

Yes, it works on mobile! However, touchscreen input delay (about 30-70ms) means your times may be slightly slower than with a mouse. On mobile, tapping the center with your thumb is fastest. We recommend comparing PC and mobile records separately. This delay is a hardware limitation from touch sensor scan cycles, digitizer processing, and OS event delivery — subtracting about 50ms from mobile records gives a comparable reading to PC performance.

Yes! Your best score is automatically saved so you can compare against it next time. It's stored in your browser's local storage, so records persist when using the same device and browser. When you set a new record, a "NEW BEST!" indicator appears. Records are not sent to any server, ensuring your privacy. By challenging at the same time daily and tracking changes, you can objectively monitor your cognitive state — serving as an indirect health indicator.