Respond to every digit except 3. A long vigilance task that reveals attentional drift.
The Sustained Attention to Response Task (SART) is a long vigilance paradigm.
Most trials are "go" (any digit except 3) so the motor response becomes automatic. The rare "no-go" (3) tests your ability to interrupt an established rhythm.
Errors tend to cluster late in the session as attention drifts - this is the hallmark of vigilance decrement.
Practice in 3-5 minute sessions improves your ability to sustain focus.
Developed by Robertson et al. (1997) as a sensitive measure of attentional lapses.
RT variability and commission errors on SART correlate with self-reported mind-wandering and ADHD symptoms.
Your capacity to stay engaged when almost nothing requires you to stop.
Because you respond to nearly every digit and withhold only to 3, the task builds a strong, automatic press habit. Your performance isolates the endogenous, self-sustained attention needed to keep monitoring a stream that rarely demands a decision. A withheld 3 reflects a moment where you were genuinely watching rather than running on autopilot.
Unlike a choice reaction task, where every item needs an active response, the rarity of the no-go target here means failures usually signal mind-wandering, not slow motor speed. This maps onto real situations like proofreading, driving a quiet motorway, or monitoring instruments, where the rare exception is the one that matters most.
Train for steadiness over a full block, not for fast individual responses.
Start with shorter blocks to learn the rhythm, then deliberately extend duration so the vigilance demand grows. Focus on keeping each press deliberate rather than reflexive, and treat the appearance of any digit as a cue to actively check "is this a 3?" Level up only once you can hold accuracy steady through the final third of a block, not just the start.
The classic trap is speeding up. As the habit strengthens, you press faster and faster, and a quick, shallow rhythm makes you blow past the rare 3 before you have processed it. If you notice your responses becoming automatic and rushed, intentionally slow down; a slightly longer reaction time often buys far better withholding accuracy.
Read the shape of your performance across the block, not just the total.
Two numbers matter most: how often you wrongly pressed on a 3 (commission errors) and how consistent your reaction times were. Strong performance looks like few missed 3s combined with steady, low-variability timing that holds from start to finish. Watch whether your errors and timing drift cluster late in the block, which signals the vigilance decrement at work.
This score is highly state-dependent: sleep loss, caffeine, time of day, and even a noisy room shift it substantially, so compare yourself across sessions rather than to a single result. A good score shows you sustained attention under these conditions; it does not measure your intelligence, your focus on engaging tasks, or how you handle genuine multitasking.