Sustained attention, or vigilance, is the ability to stay alert for rare events over time. A hand steps around a clock face one mark at a time. Now and then it jumps two marks at once; press the moment it does.
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This measures vigilance and sustained concentration: holding focus on a monotonous task and catching rare events. Long cruise monitoring is exactly this, staying sharp when little is happening.
Rather than watching passively and waiting for something unusual, actively confirm each normal step as it occurs by registering 'one mark' to yourself. This ongoing mental tally keeps your attention engaged during the long stretches of normal steps rather than letting it drift. When the double jump happens, it breaks the expected rhythm and the interruption registers immediately, even if you were not consciously braced for it.
A strong 90-second run catches 90 percent or more of the double jumps with very few false presses. The difficulty is that the signal is genuinely rare, so a long gap can quietly pull your attention into a passive state before the next signal arrives. Sustained alertness for infrequent but critical events is exactly the vigilance demanded during long cruising phases, where your workload is low but a missed alert can have serious consequences.
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