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Tap the moment they do, and see your start time. No sign-up, no email.","2026-10-06","F1 reaction test",{"instruction":162,"note":165,"picture":166,"resultLabel":178},{"touch":163,"mouse":164},"Watch the red lights. Tap the moment they all go out.","Watch the red lights. Click, or press the space bar, the moment they all go out.","5 starts. It takes about a minute.",{"kind":167,"frames":168},"storyboard",[169,173],{"name":170,"caption":171},"f1-lamps",{"touch":172,"mouse":172},"Lights on",{"name":174,"caption":175},"f1-out",{"touch":176,"mouse":177},"Lights out: tap!","Lights out: click!","Your start time",{"heading":180,"blocks":181},"How we measured this",[182,193],{"type":183,"text":184},"paragraph",[185,188,191],{"t":186,"v":187},"text","Your result is the middle time of your ",{"t":189,"v":190},"num","5",{"t":186,"v":192}," starts: as many starts were quicker as were slower. That way one lucky start or one slow moment does not change it much. The middle time is also called the median.",{"type":194,"items":195},"list",[196,199,206,213],[197],{"t":186,"v":198},"A press before the lights go out is a jump start. That start does not count and you do it again.",[200,202,204],{"t":186,"v":201},"A time under ",{"t":189,"v":203},"100",{"t":186,"v":205}," ms is too quick to be a real reaction to the lights going out, so it counts as a guess and you do that start again.",[207,209,211],{"t":186,"v":208},"A start slower than ",{"t":189,"v":210},"1",{"t":186,"v":212}," sec does not count, because something else must have held you up.",[214],{"t":186,"v":215},"If the page goes into the background during a start, that start does not count and you do it again.",1,{"mouse":14,"touch":14,"keyboard":14},{"wait":219,"time":220,"falseStart":221,"anticipation":222,"lapse":223,"paused":224,"frameGap":225,"goOn":226,"arena":227,"result":249,"flags":305},"Wait for the lights to go out.","{ms|ms}","Jump start. You get that start again.","Too quick to be a reaction. You get that start again.","{ms|ms} is too slow to count.","That start did not count: you looked away. Press to go on.","The screen stalled, so that start did not count. Press to go on.","Press to go on.",{"label":228,"countOf":231,"wait":232,"waitShort":233,"go":234,"jump":237,"tooQuick":238,"slowNext":239,"stalled":242,"lampsLit":245},{"touch":229,"mouse":230},"Test area. Five lights come on one by one. Tap when they all go out.","Test area. Five lights come on one by one. Click or press Space when they all go out.","Start {n|int} of {total|int}","Lights out and away we go","Wait for the lights to go out",{"touch":235,"mouse":236},"Go! Tap!","Go! Click!","Jump start","Too quick to count",{"touch":240,"mouse":241},"That start is used up. Tap to go on.","That start is used up. Click or press Space to go on.",{"touch":243,"mouse":244},"The screen stalled. Tap to try again.","The screen stalled. Click or press Space to try again.",{"plural":246,"one":247,"other":248},"count","{count|int} light is on","{count|int} lights are on",{"label":178,"unit":250,"unitSpoken":251,"valueSpoken":252,"quicker":253,"slower":254,"best":255,"bestSpoken":256,"say":257,"basis":265,"jumpStarts":268,"yourBest":271,"details":272},"ms","milliseconds","{ms|int} milliseconds","Quicker","Slower","Your earlier best {ms|ms}","Your best earlier result was {ms|int} milliseconds.",{"markers":258,"notCompared":263,"history":264},{"range":259,"above":260,"about":261,"below":262},"In a study of {people|int} adults reacting to a light, most took {low|int} to {high|ms}. Start lights are a different task. You took {you|ms}.","In a study of {people|int} adults reacting to a light, the average was {value|ms}. Start lights are a different task, but you took {you|ms}: slower than that.","In a study of {people|int} adults reacting to a light, the average was {value|ms}. Start lights are a different task, but you took {you|ms}: about the same.","In a study of {people|int} adults reacting to a light, the average was {value|ms}. Start lights are a different task, but you took {you|ms}: quicker than that.","We did not compare this one: too few of your starts counted.","We only show your own results for this one.",{"plural":246,"one":266,"other":267},"From your only valid start.","The middle of your {count|int} valid starts.",{"plural":246,"one":269,"other":270},"One start was jumped and done again.","{count|int} starts were jumped and done again.","Your best result in this browser: {ms|ms}.",{"tries":273,"try":276,"early":277,"quick":278,"slow":279,"away":280,"stalled":281,"compare":282,"historyWhy":283,"notComparedWhy":284,"legend":285,"device":288,"referenceWhy":302,"referenceLabel":303,"source":304},{"plural":246,"one":274,"other":275},"Your start","Your {count|int} starts","Start {n|int}","Jump start: done again","Too quick to count: done again","Too slow to count","Did not count: you looked away","Did not count: the screen stalled","What we compare you with","No published figure fits this run, so it is only set beside your own earlier results: the short orange ticks.","A result needs more starts that counted before it is set beside anything. This one is saved, and you can try again.",{"you":286,"history":287},"{ms|ms} is your result.","The short orange ticks are your earlier results in this browser.",{"heading":289,"used":290,"input":291,"screen":296,"screenValue":297,"screenUnknown":298,"timing":299,"timingEvent":300,"timingHandler":301},"Your device","You used",{"touch":292,"mouse":293,"keyboard":294,"pen":295},"A touch screen","A mouse","A keyboard","A pen","Your screen","Shows {hz|int} pictures a second ({hz|int} Hz). Each one stays for about {ms|ms}.","Not measured yet.","Timing","From the browser's own record of each press.","From the moment the page read each press, which can be a little later than the press.","No study has timed people on a row of start lights. The nearest is a study of {people|int} adults reacting to a single light on a screen: their average was {ms|ms}. It is a different task, so the figure is a mark, not a ranking. Your own earlier results are the short orange ticks.","Study average","Source",{"false-start":306,"anticipation":307,"lapse":308,"hidden":309,"frame-gap":310,"dropped-frames":311,"aborted":312,"unfinished":313,"too-few-trials":314,"latency-unknown":315,"untrusted":316,"key-repeat":317,"uniform":318,"implausible-rate":319,"assisted":320,"low-accuracy":321,"paste-refused":322,"skimmed":323,"low-comprehension":324,"straightlining":325,"too-fast":326,"too-many-skipped":327,"prorated":328,"not-enough-answers":329,"ceiling":330,"too-many-voids":331,"frame-limited":332,"frame-unknown":333,"lower-bound":334},"You pressed before the lights went out: those starts were done again.","Some presses were too quick to be reactions: those tries were done again.","Some tries were too slow to count.","The page went into the background: that part was not counted.","The screen stalled for a moment: that try was done again.","The screen was slow to change on some tries: those times may be a little short.","Stopped before the end.","Not finished.","Too few tries counted to give a result.","The browser did not say how long its sound takes to play, so the times include an unknown delay.","Some presses did not come from your own touch, click or key and were ignored (a script or another program).","A held key repeated by itself: the repeats were ignored.","The presses came at evenly spaced intervals, like a machine's: the result is kept but not compared.","Faster than one finger can tap: runs with several fingers are kept but not compared.","Your keyboard corrected or predicted some words for you, so this run is not compared.","Too few answers were right to compare this run.","Pasted text was left out: only what you typed counts.","The text was on screen too briefly to have been read, so the reading speed is not compared.","Too few questions about the text were answered right, so the reading speed is not compared.","Many answers in a row were the same, also where statements point in opposite directions: the result is shown but not compared.","You answered very quickly, in under a second per statement on average, so this result is not compared with others.","Too many statements were left out to give a result.","Some statements were left out: their scales were completed from your other answers.","A scale has too few answers for a result.","You reached the end of the test, so your true result may be higher.","Too many tries were not counted (the page was in the background or the screen stalled).","The browser reports the mouse once per screen frame, so this is the screen's rate, not the mouse's.","The screen's frame rate is unknown, so it cannot be told whether this is the mouse's rate.","Many reports arrived together: the mouse reports at least this often.",1791315148097]