Digits arrive one at a time, spoken aloud and shown on screen, and you are not told how many are coming. When the stream stops, you recall the last few in reverse order, most recent first. Each level you clear adds a digit to the span. It combines holding a moving window of a running stream with a backward-recall transformation, the working-memory load a pilot carries when reading back a clearance while still flying.
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This measures backward working memory over a running stream: how many recent digits you can hold from an unannounced-length sequence and then reorder in reverse. It layers a manipulate-while-holding demand on top of simple recall, which is the load a pilot carries when reading back a clearance while still flying the aircraft.
Do not try to hold the whole stream. Keep only the last few digits alive, and as each new digit lands, drop the oldest and add the new one to the end of your mental list. When the stream stops you already hold the window; then read it out from the newest backwards.
In our testing, a typical adult reaches a reverse span of around 4 or 5 digits, and steady practice can push it higher. As a rough guide, aim to add a digit to your best span every few sessions rather than expecting a large jump at once.
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