About this exercise
Attentional Blink (Raymond, Shapiro, & Arnell, 1992) demonstrates a temporary "blindness" after detecting a first target — for ~200–500ms, your attention can't see a second one.
Targets appear in a rapid stream of distractors at ~10 items per second. The 2nd target falls in the blink window most of the time.
Training narrows the blink window. Mindfulness training and high arousal both reduce the effect.
It's a robust marker of temporal attention dynamics.