Test sustained attention with a four-minute continuous response task. Click only when the green target appears, then review your hits, misses, false alarms, accuracy, and average reaction time.
This is a self-check and practice exercise, not a medical test or an ADHD diagnosis.
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Click only when the green circle appears. Ignore the blue square.
“Attention span” is an everyday label for several abilities. It can mean staying with a lecture, noticing important details, resisting distraction, or keeping a goal active while events repeat. A single browser activity cannot capture all of those. This attention span test focuses on sustained attention and response control during a repetitive visual task.
The format resembles a simple continuous performance task. Stimuli appear one after another for several minutes. Most are blue square non-targets that require no action. Green circle targets require a response. Because the rule is easy and the sequence is repetitive, the challenge is maintaining the rule consistently rather than solving a difficult puzzle.
The production session contains 120 trials spaced two seconds apart. Thirty percent are green targets in a randomized order. A response to green is a hit; no response to green is a miss. A response to blue is a false alarm; correctly ignoring blue is a correct rejection. Average reaction time uses successful target responses only, so an impulsive click on blue cannot make that number look faster.
| Result | What it records | Practical reading |
|---|---|---|
| Hits | Responses to green targets | Target detection during the session |
| Misses | Green targets without a response | Possible lapse, caution, or delayed response |
| False alarms | Responses to blue non-targets | Possible anticipation or response-control error |
| Average RT | Mean time for successful hits | Response speed on correctly detected targets |
Accuracy combines hits and correct rejections across all trials. That makes it useful for checking the whole response rule, but it should be read beside the error counts. Because non-targets are more common, someone can ignore everything and still appear moderately accurate while missing every target. Hits, misses, and false alarms show the fuller pattern.
Many hits with few false alarms suggests that you maintained the target rule during this particular run. More misses may reflect moments when attention drifted, but they can also come from a cautious response style, an interruption, or misunderstanding the timing. More false alarms may reflect anticipation or confusion between target colors. None of these patterns has a clinical meaning by itself.
Reaction time adds context rather than a verdict. Very fast responses with many false alarms can indicate that speed took priority over identification. Slower responses with few errors may reflect a deliberate strategy. A balanced result is one you can reproduce without guessing. If you repeat the task, keep the device, browser, input method, and environment similar.
Sleep, stress, pain, hunger, caffeine, medication, noise, notifications, and recent practice can all change performance. The browser and hardware matter too: screen refresh rate, a wireless keyboard, touch input, battery-saving modes, and background activity can alter measured timing. Switching tabs cancels the session because browsers may throttle timers when a page is hidden.
The randomized target order prevents memorizing one fixed sequence, but it also means two runs are not identical. Compare trends across several sessions instead of treating the highest result as your permanent capacity. A short task can be useful practice and a personal benchmark, but it is not a comprehensive assessment of real-world concentration.
Sustained-attention tasks sometimes appear inside professional assessment batteries, but task performance alone does not diagnose ADHD. A qualified clinician considers symptoms across settings, their history, daily impairment, other possible explanations, and standardized evidence. People with and without ADHD can both have strong or weak runs on a short online task.
Use this page as a self-check and practice tool only. If attention difficulties are persistent, occur in more than one part of life, or interfere with work, study, relationships, or safety, consider speaking with a qualified health professional. Do not start, stop, or change medication based on this result.
This task asks you to hold one simple rule over time. The Number Memory Test instead asks you to retain an increasingly long digit sequence, while the N-Back Test continuously updates which earlier item must be compared with the current one. Trying all three can illustrate different task demands, but their scores should not be combined into an IQ or diagnosis.
It measures performance on one short sustained-attention task: keeping a simple rule active, detecting targets, withholding responses to non-targets, and responding consistently over four minutes. It does not measure every meaning of attention span.
A green circle or blue square appears every two seconds. Respond only to green circles. The test records a hit for a correct target response, a miss for an unanswered target, a false alarm for a response to blue, and a correct rejection when blue is ignored.
The instructions and four-minute format are designed for adults and older teens who can understand the response rule. There are no age-normed clinical scores, so results should be used for personal practice and comparison only.
A useful result has many hits and few misses or false alarms, but there is no diagnostic cutoff here. Compare several sessions taken on the same device under similar sleep, noise, and distraction conditions.
Yes. A miss means you did not respond to a green target. A false alarm means you responded to a blue non-target. Misses can reflect lapses or caution, while false alarms can reflect anticipation, confusion, or impulsive responding.
No. This page is a self-check and practice exercise, not a medical test or ADHD diagnosis. ADHD assessment requires a qualified professional who considers symptoms, history, functioning, and information beyond a browser task.
Sleep, stress, interruptions, motivation, practice, screen refresh rate, and input device can all affect a short task. Random target order also changes each session. Look for a pattern across multiple comparable runs, not a single best or worst score.
Yes. Tap the display when the green target appears. On desktop you can click or use Space or Enter. Because touch and keyboard latency differ, compare results collected with the same device and input method.