By Robert, biophysics PhD candidate who builds Helibrain · Last checked: 2026-10-25
What this test measures
It measures simple reaction time: how quickly you respond to one expected signal. It is a one-minute version of the Psychomotor Vigilance Test (PVT), a research task built to track alertness during long stretches of work without sleep [1]. The lab version runs 10 minutes and a brief version 3 minutes [4]. This is the same test as in the Helibrain app: one practice round, then 10 timed rounds with a random 1.5 to 4.5 second wait.
How to read your score
- Average reaction time: the mean of your timed taps. Lower is faster.
- Slow taps: taps slower than 500 ms. In PVT research these count as lapses of attention, and they go up when people are short on sleep [2].
- Early taps: taps before the green circle, or under 100 ms, which is too fast to be a real response. They are left out of the average.
What is a good reaction time?
The honest answer: it depends on your device, so compare with yourself. In one study, the same people averaged 284 ms on the standard handheld PVT device and 379 ms on a touchscreen version, partly because the finger has to travel to the screen [5]. Your screen, mouse and browser add their own delay. A score is most useful next to your own earlier scores, taken on the same device.
What slows your reaction time?
Sleep loss is the best-studied cause. In sleep-deprived people, responses get slower overall and long lapses become more common [2]. Speed and lapse measures pick up sleep loss better than the plain average does [3]. Time of day, caffeine, distraction and practice can all move your score too, so a single bad run is not a verdict.
Can one minute tell you much?
Some, but less than a long test. Shorter versions of the PVT still detect sleep loss, with smaller effects than the 10-minute version [4]. Treat one run as a snapshot. Several runs at similar times of day tell you more than any single number.
Sources
- Dinges DF, Powell JW (1985). Microcomputer analyses of performance on a portable, simple visual RT task during sustained operations. Behavior Research Methods, Instruments, & Computers 17(6):652–655. https://doi.org/10.3758/BF03200977
- Lim J, Dinges DF (2008). Sleep deprivation and vigilant attention. Annals of the New York Academy of Sciences 1129:305–322. https://doi.org/10.1196/annals.1417.002
- Basner M, Dinges DF (2011). Maximizing sensitivity of the psychomotor vigilance test (PVT) to sleep loss. Sleep 34(5):581–591. https://pmc.ncbi.nlm.nih.gov/articles/PMC3079937/
- Basner M, Mollicone D, Dinges DF (2011). Validity and sensitivity of a brief psychomotor vigilance test (PVT-B) to total and partial sleep deprivation. Acta Astronautica 69(11–12):949–959. https://pmc.ncbi.nlm.nih.gov/articles/PMC3197786/
- Grandner MA, Watson NF, Kay M, Ocaño D, Kientz JA (2018). Addressing the need for validation of a touchscreen psychomotor vigilance task. Sleep Health 4(5):387–389. https://pmc.ncbi.nlm.nih.gov/articles/PMC6152888/