Monitor two simultaneous streams: numbers on the left, letters on the right. Press the correct button each time your target appears. Based on Pashler (1994) dual-task interference and divided attention paradigms.
Very Easy
45s game, item every 2.2s, 25% target density
Easy
60s game, item every 1.8s, 25% target density
Medium
60s game, item every 1.5s, 30% target density
Hard
75s game, item every 1.2s, 30% target density
Expert
90s game, item every 1.0s, 35% target density
Scientific Background
Based on: Dual-Task Interference / Divided Attention Paradigm (Pashler, 1994) (Pashler & undefined, 1994)