Vigilance

Vigilance is the sustained readiness to detect rare or unpredictable signals during extended observation. It is distinguished from sustained attention by its explicit focus on infrequent targets: the challenge is not just maintaining focus but maintaining response sensitivity for a signal that may appear rarely and without warning. The vigilance decrement, systematically documented by Mackworth (1948), describes the reliable drop in detection probability that occurs within the first 30 minutes of a monitoring task. Subsequent research has identified two contributing mechanisms: attentional resource depletion, where sustained demand gradually depletes available capacity, and criterion shift, where the internal threshold for signalling a detection rises more conservatively over time, raising the miss rate independently of resource levels.

Reference: Mackworth, 1948; Parasuraman, 1984. The NeuroRank implementation holds the canonical form and scales interference via task-irrelevant stimulus density.

1. Detecting a rare but decisive flicker at the edge of vision in an FPS environment during a long static hold, where targets appear at unpredictable intervals across many empty seconds.
2. Catching a low-frequency rotation tell on the minimap during a slow farming phase in a MOBA, where the critical signal appears at most once every several minutes.
3. Remaining responsive to a potential audio cue indicating a grenade pull through a wall in CS2 across the full duration of a lengthy T-side preparation phase.

The Flicker module in the FPS genre is NeuroRank's closest approximation of a vigilance task: targets appear at unpredictable intervals and the player must detect them with high sensitivity. The Reaction module's go/no-go phase also stresses vigilance by intermixing infrequent no-go stimuli among frequent go stimuli, demanding sustained attention to target identity over time rather than simple speed.