A row of arrows appears. Sometimes they all point the same way; sometimes the flanking arrows point opposite the middle one. Your job is to react to the center arrow only, as fast as you can, without being pulled by the neighbors.
The Science: The Eriksen Flanker Task (Eriksen & Eriksen, 1974) — one of the most cited paradigms in attention research. The reaction-time gap between congruent and incongruent trials is a direct measure of executive control.
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