A Corsi block task. Tiles light up in order on a grid and you tap them back in the same order, starting at three and growing by one every time you clear it.
Adult Corsi forward spans are usually reported around 5–6. Unlike digit span this leans on spatial working memory rather than verbal rehearsal.
The grid is 4×4 rather than the classic 9 blocks, which makes it harder to remember the order as a single drawn line.
Digit span leans heavily on verbal rehearsal — repeating numbers silently. Remembering positions uses spatial memory instead, which makes the task language-independent.
Until two misses at the same length. A single slip gets you another attempt at that length.
Not yet — it is fixed at 0.6 s per tile. Changing the speed changes measured span too, so the grade bands would no longer mean the same thing.