Flicker Detection

Flicker detection concerns the visual system's sensitivity to brief, intermittent, or low-contrast changes in a stimulus, often studied through the critical flicker fusion (CFF) threshold, the frequency at which an intermittent light is perceived as continuous rather than flickering. De Lange (1958) characterized how the CFF threshold varies with luminance and stimulus size, establishing that flicker sensitivity is not a fixed property of the eye but scales with the temporal dynamics of the underlying visual channels. Elevated flicker-fusion thresholds are associated with faster temporal processing and are one of the more consistent correlates of expertise in fast-paced visual tasks.

Reference: De Lange, 1958. The NeuroRank implementation holds the canonical form and scales interference via task-irrelevant stimulus density.

1. Spotting a target that flashes into view for a single frame at the edge of the screen in a fast-paced FPS engagement.
2. Noticing a brief muzzle flash through foliage in a jungle or long-grass engagement before the source is otherwise visible.
3. Detecting the near-imperceptible flicker of an enemy's outline breaking through a smoke cloud for a single frame.

NeuroRank's Flicker module, run only in the FPS genre, presents brief, low-salience target onsets and measures response time and accuracy against distFromCenter, directly operationalizing flicker-detection sensitivity as a competitive-relevant skill. Performance feeds the Reaction Speed dimension for the FPS pool.