Gyroscope Benchmarks / Mind
Stroop test: can you ignore the word?
This test measures how well you suppress an automatic reading response when the rule asks you to act on color instead.
Why it matters
Most of a day is spent overriding something automatic. You reach for the phone when it buzzes, then put it down because you decided to finish the page. You start answering the question you expected instead of the one you were asked, then catch yourself. That catch is interference control, and Color Clash measures it in milliseconds. Reading is so practiced that the word arrives before the color does, so tapping the ink means holding a rule in mind and stopping a faster answer, over and over, without slowing to a crawl.
This is one of the first abilities to slip on a bad day and one of the harder ones to keep with age. The interference gap tends to widen through later adulthood, because the reading habit stays quick while the stopping gets slower. Short sleep widens it too, and you are a poor judge of how much: people running on six-hour nights feel roughly fine while their attention scores say otherwise.
Van Dongen et al., Sleep, 2003
That is why one number, measured the same way every month, says more than how you feel. A run in the Strong band tells you the brakes are working. A gap that has drifted noticeably wider on the same phone at the same hour tells you something changed, weeks before you would have noticed it in a meeting or on the road.
What this test measures
Color Clash is a Stroop-style interference task. A color word appears in colored ink, and your job is to tap the ink color while ignoring what the word says. Matching trials let reading and color point to the same answer. Clashing trials force you to suppress the quicker, practiced reading response.
The useful signal is interference cost: reaction time on clashing trials minus reaction time on matching trials. Errors on clashing trials matter too. The original 1935 experiments established that naming ink colors becomes slower when the printed word conflicts with them.
Stroop, Journal of Experimental Psychology, 1935
A later computerized study shows why absolute numbers need context. In one young-adult condition, mean correct reaction time was 761 milliseconds for congruent trials and 927 milliseconds for incongruent trials, a 166-millisecond gap. The task used a keyboard, 120 congruent trials, and 72 incongruent trials, unlike a short phone run.
Do the test right now
- 1Open Color Clash in Gyroscope. Quick mode takes about 20 seconds, while the full test takes about 40 seconds.
- 2On every trial, identify the ink color. Tap that color, not the color named by the word.
- 3Respond quickly, but do not trade every difficult trial for a guess. Complete both matching and clashing trials.
- 4Keep the reaction-time gap between clashing and matching trials, plus the clashing-trial error rate. Do not judge the run by its single fastest response.
Reference bands
The lab values below are one experimental context, not universal adult norms. They are useful because they show a measurable interference gap under a documented protocol.
| Lab condition | Mean reaction time |
|---|---|
| Congruent | 761 ms |
| Incongruent | 927 ms |
| Interference cost | 166 ms |
Galer et al., Psychologica Belgica, 2014
For Color Clash, use Gyroscope's practical bands below. The 250–300 millisecond interval is a transition zone. Phone latency and a much shorter trial set make direct comparison with the lab table inappropriate.
| Interference cost | Practical band |
|---|---|
| Under 150 ms | Strong |
| 150–250 ms | Typical |
| Over 300 ms | High |
Stroop, Journal of Experimental Psychology, 1935. Research context for Gyroscope's practical bands.
What moves your score
Interference cost changes with your current state as well as task details. Short-term sleep deprivation has its largest meta-analytic effect on lapses in simple attention, with Hedges's g of -0.776 across a review that included 70 articles and 147 tests.
Lim and Dinges, Psychological Bulletin, 2010
- Sleep loss and fatigue can slow attention and make difficult trials less steady.
- Practice can reduce the cost as the response rule becomes familiar.
- Stress or illness can change the balance between speed and errors.
- Phone and touchscreen latency shift absolute reaction times, so keep the device consistent.
How to improve
Interference cost falls when the rule gets easier to hold and the stop gets faster than the read. Both come from how you do the trials, not from doing more of them in a rush.
- Look at the ink, not the letters. Soften your focus so the word is a colored shape rather than something to read. The less you process the letters, the less there is to suppress.
- Set the rule before you start. Say "ink, not word" once, out loud if you can, before the first trial. Loading the rule up front is cheaper than rebuilding it mid-run after a slip.
- Keep one steady pace. A clashing trial should take a beat longer than a matching one, and that is fine. Guessing ahead on the easy ones, then stalling on the hard ones, inflates the gap and the errors at the same time.
- Let a mistake go. One wrong tap tends to slow the next three trials if you dwell on it. Note it, breathe out, and take the next trial at your normal speed.
- Quiet the room and the phone. Silence notifications, put the screen at a comfortable distance, and run it seated. A voice from the next room lands right on the ability you are testing.
- Do a short warm-up. A quick run before the full test settles your finger placement and reminds you of the rule, so the scored run reflects your control rather than your first-trial fumbles.
Retest once a month on the same phone, at a similar hour, rested and after a warm-up. One gap read the same way each time is a line you can trust. Ten runs in one evening, some tired and some not, is just noise with a chart.
Track it
Log it in the app.
Download Gyroscope and run Color Clash in about a minute. See how you compare to your peers, to the studies, and to your own baseline over time.
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