1-Back Letters

1-Back Letters is a sustained attention and working memory drill. You watch a rapid stream of letters and respond only when the current letter matches the one immediately before it.

This trains continuous monitoring, short-term retention, and response control. Because the correct decision depends on the previous stimulus, the task strengthens the ability to keep recent information active while processing new input.

Hits reflect accurate target detection, while false alarms measure impulsive responses or lapses in attention. Improving performance usually means balancing speed with careful decision-making.

Faster speeds increase cognitive load and reveal attention drift more quickly. Over time, short sessions can improve focus stability, working memory reliability, and inhibition under pressure.